Online research in philosophy

Asked on the Dick Cavett show about her former Stalinist comrade Lillian Hellman, Mary McCarthy replied, "Every word she says is a lie, including 'and' and 'the'." The language used to describe sensory and perceptual consciousness is worthy of about the same level of trust. One must adapt oneself to the fact that every ordinary word used to describe this domain is ambiguous; that different theoreticians use the same words in very different ways; and that every speaker naturally (...) thinks that his or her usage is, of course, the correct one. Notice that we have already partially vindicated Mary McCarthy: even the word "the" cannot always be trusted. (shrink)

In The Problem of Perception, A.D. Smith’s central aim is to defend the view that we can directly perceive ordinary objects, such as cups, keys and the like.1 The book is organized around the two arguments that Smith considers to be serious threats to the possibility of direct perception: the argument from illusion, and the argument from hallucination. The argument from illusion threatens this possibility because it concludes that indirect realism is true. Indirect realism is the view that we perceive (...) mind-independent ordinary objects, but can only do so indirectly, by perceiving mind-dependent objects: objects whose existence depends on being perceived or thought about. The argument from hallucination draws a similar conclusion: if we perceive mindindependent ordinary objects at all, then our perception of them is indirect in the same way. In responding to these arguments, Smith develops an account of percep- tual consciousness. Perceptual consciousness is a kind of experience, distinct from what Smith calls ‘mere sensory experiences’, or equivalently, ‘mere sensation’. Perceptual consciousness is experience that is properly percep- tual, in which one has the phenomenology of perceiving things in the external world (including one’s body) that exist independently of one’s mind. Perceptual consciousness on its own does not suffice for actually being in perceptual contact with mind-independent reality, although it suffices for it to seem as if one i s . It follows that perceptual consciousness does not suffice for direct perception of ordinary objects, or for direct realism. Nevertheless, Smith holds that the correct account of perceptual consciousness is a crucial element in blocking the arguments from illusion and hallucination, and therefore in supporting the possibility of direct perception. This is an extraordinarily engaging book. Within a single, unified narrative, one encounters the views of many philosophers—Husserl, Fine, Broad, Sextus Empiricus, Loar, Schopenhauer, Meinong, Burge, Dilthey, Russell, Dennett, Sartre, O’Shaughnessy, Evans, Berkeley, Craig, Brentano and many.... (shrink)

One of the most important issues concerning the foundations ofconscious perception centerson thequestion of whether perceptual consciousness is rich or sparse. The overflow argument uses a form of ‘iconic memory’ toarguethatperceptual consciousnessisricher (i.e.,has a higher capacity) than cognitive access: when observing a complex scene we are conscious of more than we can report or think about. Recently, the overflow argumenthas been challenged both empirically and conceptually. This paper reviews the controversy, arguing that proponents of sparse perception are committed (...) to the postulation of (i) a peculiar kind of generic conscious representation that has no independent rationale and (ii) an unmotivated form of unconscious representation that in some cases conflicts with what we know about unconscious representation. (shrink)

The strong sensorimotor account of perception gives self-induced movements two constitutive roles in explaining visual consciousness. The first says that self-induced movements are vehicles of visual awareness, and for this reason consciousness ‘does not happen in the brain only’. The second says that the phenomenal nature of visual experiences is consists in the action-directing content of vision. In response I suggest, first, that the sense in which visual awareness is active should be explained by appeal to the role (...) of attention in visual consciousness, rather than self-induced movements; and second, that the sense in which perceptual consciousness does not happen in the brain only should be explained by appeal to the relational nature of perceptual consciousness, appeal to which also shows why links with action cannot exhaust phenomenal content. (shrink)

Hegel's discussion of the concept of “habit” appears at a crucial point in his Encyclopedia system, namely, in the transition from the topic of “nature” to the topic of “spirit” (Geist): it is through habit that the subject both distinguishes itself from its various sensory states as an absolute unity (the I) and, at the same time, preserves those sensory states as the content of sensory consciousness. By calling habit a “second nature,” Hegel highlights the fact that incipient spirit (...) retains a “moment” of the natural that marks a limitation compared to “pure thought” but that also makes perceptual consciousness possible. This makes Hegel's account analogous in important respects to John McDowell's “naturalism of second nature.” But Hegel's account of habit can be seen as a version of a Kantian synthesis of the productive imagination—and hence presupposes a given material that can become one's own by means of habit. This does not mean that Hegel falls into the Myth of the Given, but it does suggest that an appropriate account of second nature might be committed to something McDowell wants to deny: that nonconceptual states of consciousness play a role (even if not a justificatory role) in perception. (shrink)

High figure-ground contrast usually results in more positive evaluations of visual stimuli. This may either reflect that high figure-ground contrast per se is a desirable attribute or that this attribute facilitates fluent processing. In the latter case, the influence of high figure-ground contrast should be most pronounced under short exposure times, that is, under conditions where the facilitative influence on perceptual fluency is most pronounced. Supporting this hypothesis, ratings of the prettiness of visual stimuli increased with figure-ground contrast under (...) short exposure times (.3, 1, and 3 seconds, respectively). This positive influence of figure-ground contrast was eliminated under an exposure time of 10 seconds. We conclude that stimuli with high figure-ground contrast are more appealing because they are easier to process, not because high figure-ground contrast per se is a desirable attribute. We discuss this finding in the context of William James? notion that the fringe of consciousness includes vague contextual feelings at the periphery of the focus of attention and suggest that perceptual fluency is one of these feelings. (shrink)

Our perception of external features comprises, among others, functional and phenomenological levels. At the functional level, the perceiver’s mind processes external features according to its own causal- functional organization. At the phenomenological level, the perceiver has consciousness of external features. The question of this paper is: How do the functional and the phenomenological levels of perception relate to each other? The answer I propose is that functional states of specifically perceptual attention constitute the necessary basis for the arising (...) of consciousness in a perceiver. -/- Widely studied within cognitive psychology, perceptual attention is still awaiting a thoroughgoing philosophical treatment. The paper presents and draws upon Anne Treisman’s feature-integration theory of attention (cf. A. Treisman & G. Gelade, “A Feature-Integration Theory of Attention,” Cognitive Psychology, 12, 1980. Pp. 97-136). According to this theory, attentional mechanisms are responsible for the binding of perceptual features into coherent and stable objects of perception. By itself, I will claim, the theory of feature integration does not allow a straightforward reduction of consciousness to the functional processing underlying it. However, on the basis of Treisman’s theory we can produce a methodological argument for endorsing the non-reductivist thesis that attentional states constitute the necessary basis for the arising of consciousness in a perceiver. The paper closes by presenting this argument, according to which the thesis is implied by a unified account of the common representational natures of attentional and conscious states. (shrink)

The problem of the richness of visual experience is that of finding principled grounds for claims about how much of the world a person actually sees at any given moment. It is argued that there are suggestive parallels between the two-component analysis of experience defended by Wilfrid Sellars, and certain recently advanced information processing accounts of visual perception. Sellars' later account of experience is examined in detail, and it is argued that there are good reasons in support of the claim (...) that the sensory nonconceptual content of experience can vary independently of conceptual awareness. It is argued that the Sellarsian analysis is not undermined by recent work on change blindness and related phenomena; a model of visual experience developed by Ronald Rensink is shown to be in essential harmony with the framework provided by Sellars, and provides a satisfactory answer to the problem of the richness of visual experience. (shrink)

In this paper I argue that perceptual ascriptions lend themselves to intensional readings, and that perceptual predicates can denote phenomenal states on such readings. I show that Montague's treatment of quantification in intensional contexts applies to intensional perceptual ascriptions. I conclude with some remarks on the implications of these findings for disjunctive and non-disjunctive theories of perceptual experience.

In the present paper, I shall argue that disjunctively construed naïve realism about the nature of perceptual experiences succumbs to the empirically inspired causal argument. The causal argument highlights as a first step that local action necessitates the presence of a type-identical common kind of mental state shared by all perceptual experiences. In a second step, it sets out that the property of being a veridical perception cannot be a mental property. It results that the mental nature of (...) perceptions must be exhausted by the occurrence of inner sensory experiences that narrowly supervene on the perceiver. That is, empirical objects fail directly to determine the perceptual consciousness of the perceiver. The upshot is that not only naïve realism, but also certain further forms of direct realism have to be abandoned. (shrink)

In this paper, I will ask whether naïve realists have the conceptual resources for meeting the challenge stemming from the causal argument. As I interpret it, naïve realism is committed to disjunctivism. Therefore, I first set out in detail how one has to formulate the causal argument against the background of disjunctivism. This discussion is above all supposed to work out the key assumptions at stake in the causal argument. I will then go on to sketch out several possible rejoinders (...) on behalf of naïve realism. It will be shown that they all fail to provide a satisfying account of how causation and perceptual consciousness fit together. Accordingly, the upshot will be that the causal argument provides good reason to abandon disjunctivism and, instead, to promote a common factor view of perception. (shrink)

This is a further improved version of a paper previously called `Reflective and Affective Consciousness'. It is better now -- more or less comprehensible if still imperfect. It is the fourth in a series of papers, and continues the idea that consciousness needs to be analysed not in any of the boring ways: by way of the plain or 17th Century materialism that is still with us in new packages, or immaterialism, or dualistic identity theory, or functionalism and (...) cognitive science with philosophical ambition. (For argued surveys of these, and a particular allegiance now abandoned in favour of Consciousness as Existence, go to Mind Brain Connection and Mind and Brain Explanation .) Consciousness needs to be analysed, rather, mainly in terms of things existing outside of heads. The final draft of the paper will eventually turn up in the annual proceedings of The Royal Institute of Philosophy, a volume under the title Minds and Persons edited by Anthony O'Hear. At the end of the paper here there is a summary of it -- in fact the handout for a lecture. (shrink)

(No abstract is available for this citation).

Dienes and Seth (2010) conclude that confidence ratings and post-decision wagering are two comparable and recommendable measures of conscious experience. In a recently submitted paper, we have however found that both methods are problematic and seem less suited to measure consciousness than a direct introspective measure. Here, we discuss the methodology and conclusions put forward by Dienes and Seth, and why we think the two experiments end up with so different recommendations.

The consensus in contemporary philosophy of mind is that how a perceptual experience represents the world to be is built into its sensory phenomenology. I defend an opposing view which I call ‘moderate separatism’, that an experience's sensory phenomenology does not determine how it represents the world to be. I argue for moderate separatism by pointing to two ordinary experiences which instantiate the same sensory phenomenology but differ with regard to their intentional content. Two experiences of an object reflected (...) in a mirror can possess the same spatial phenomenology while representing that object to occupy different spatial locations. So, contrary to the current consensus, the representation of spatial location is not fixed by an experience's sensory phenomenology. (shrink)

In their comment on Sandberg, Timmermans, Overgaard, and Cleeremans (2010), Dienes and Seth argue that increased sensitivity of the Perceptual Awareness Scale (PAS) is a consequence of the scale being less exclusive rather than more exhaustive. According to Dienes and Seth, this is because PAS may measure some conscious content, though not necessarily relevant conscious content, ‘‘If one saw a square but was only aware of seeing a flash of something, then one has not consciously seen a square.” In (...) this reply, we claim that there is a difference between conscious visual experience, which may be partial, and the resulting conscious content, which is conceptual. Whereas PAS measures the first, confidence judgments and post-decision wagering measure the second. (shrink)

One of the promising approaches to the problem of perceptual consciousness has been the representational theory, or representationalism. The idea is to reduce the phenomenal character of conscious perceptual experiences to the representational content of those experiences. Most representationalists appeal specifically to non-conceptual content in reducing phenomenal character to representational content. In this paper, I discuss a series of issues involved in this representationalist appeal to non-conceptual content. The overall argument is the following. On the face of (...) it, conscious perceptual experience appears to be experience of a structured world, hence to be at least partly conceptual. To validate the appeal to non-conceptual content, the representationalist must therefore hold that the content of experience is partly conceptual and partly non-conceptual. But how can the conceptual and the non-conceptual combine to form a single content? The only way to make sense of this notion, I argue, leads to a surprising consequence, namely, that the representational approach to perceptual consciousness is a disguised form of functionalism. (shrink)

Both visual experience and conscious thought represent external objects, but in visual experience these objects seem present before the mind and available for direct access in a way that they don?t in conscious thought. In this paper, I introduce a couple of challenges that this ?Scene-Immediacy? of visual experience raises for traditional versions of Representationalism. I then identify a resource to which Representationalists can appeal in addressing these challenges: the low-detail fringe of visual experience. I argue that low-detail contents within (...) visual experience provide the mind with a rich access to additional high-detail information, an access that is not found in conscious thought. This access, in turn, speaks to the challenges raised by the Scene-Immediacy of visual experience. Robert Schroer is an Assistant Professor at the University of Minnesota at Duluth. (shrink)

Ayahuasca, a hallucinogen with profound consciousness- altering properties, has been increasingly utilized in recent studies (e.g., Strassman, 2001; Shanon, 2002a,b). However, other than Shanon's recent work, there has been little attempt to examine the effects of ayahuasca on perceptual, affective and cognitive experience, its relation to fringe consciousness or to pertinent personality variables. Twenty-one volunteers attending a seminar on ayahuasca were administered personality measures and a semi-structured interview about phenomenal qualities of their experience. Ayahuasca ingestion was associated (...) with profound alterations of temporal- spatial experiences including expansive space and slowed time. Ayahuasca use was also associated with positive emotional states, higher levels of fantasy proneness and psychological absorption and a greater openness to mystical experiences. Conversely, quickened time was associated with negative emotionality. The results are discussed within a multi-faceted model of fringe consciousness with a particular emphasis on Hunt's (1995) models of cross-modal translation as the basis for higher-order symbolic cognition and support James' (1890/1950) contention that fringe consciousness is essential to human cognition. (shrink)

Right now my conscious experience is directed at part of the world. It takes in some aspects of things around me and not others. Some bits of the world occupy my attention, other worldly goings on condition or colour the character of my current perceptual experience. I experience buildings in view through the window, the clothes in the corner of the room, the colour of the walls, the plate with breads, the coffee mugs, the smell of fresh laundry, the (...) muffled sounds of someone in the kitchen, the sounds from the street: a sequence of things that in turn capture my attention moment to moment. And all the while thoughts occur to me, modulating my conscious awareness. I have no doubt that the world and my place in it, together with my recent past history, explains the particular form my consciousness takes right now. But what shape does that explanation take? Things out there beyond the boundaries of my skin enter into the conscious events I undergo. The inner is in this way shaped and determined by those outer things that impress themselves on the mind. What is it, though, for consciousness of this kind to go on at all? (shrink)

Over a decade ago, I introduced a large-scale theory of the cognitive brain which explained for the first time how the human brain is able to create internal models of its intimate world and invent models of a wider universe. An essential part of the theoretical model is an organization of neuronal mechanisms which I have named the Retinoid Model (Trehub, 1977, 1991). This hypothesized brain system has structural and dynamic properties enabling it to register and appropriately integrate disparate foveal (...) stimuli into a perspectival, egocentric representation of an extended 3D world scene including a neuronally-tokened locus of the self which, in this theory, is the neuronal origin of retinoid space. As an integral part of the larger neuro-cognitive model, the retinoid system is able to perform many other useful perceptual and higher cognitive functions. In this paper, I draw on the hypothesized properties of this system to argue that neuronal activity within the retinoid structure constitutes the phenomenal content of consciousness and the unique sense of self that each of us experiences. -/- Trehub, A. (1977). Neuronal models for cognitive processes: Networks for learning, perception, and imagination. _Journal of Theoretical Biology_ 65: 141-169. -/- Trehub, A. (1991). _The Cognitive Brain_. MIT Press. -/- . (shrink)

Neural Darwinism (ND) is a large scale selectionist theory of brain development and function that has been hypothesized to relate to consciousness. According to ND, consciousness is entailed by reentrant interactions among neuronal populations in the thalamocortical system (the ‘dynamic core’). These interactions, which permit high-order discriminations among possible core states, confer selective advantages on organisms possessing them by linking current perceptual events to a past history of value-dependent learning. Here, we assess the consistency of ND with (...) 16 widely recognized properties of consciousness, both physiological (for example, consciousness is associated with widespread, relatively fast, low amplitude interactions in the thalamocortical system), and phenomenal (for example, consciousness involves the existence of a private flow of events available only to the experiencing subject). While no theory accounts fully for all of these properties at present, we find that ND and its recent extensions fare well. (shrink)

The first part of this paper defends a 'two-factor' approach to mental representation by moving through various choice-points that map out the main peaks in the landscape of philosophical debate about representation. The choice-points considered are: (1) whether representations are conceptual or non-conceptual; (2) given that mental representation is conceptual, whether conscious perceptual representations are analog or digital; (3) given that the content of a representation is the concept it expresses, whether that content is individuated extensionally or intensionally; (4) (...) whether intensional contents are individuated by external or internal conditions; and (5) given that conceptual content is determined externally, whether the possession conditions for concepts are external or internal. The final part of the paper examines the relationship between representation and consciousness, arguing that any account of mental representation, though necessary for a complete account of consciousness, cannot be sufficient for it. (shrink)

Most ?theories of consciousness? are based on vague speculations about the properties of conscious experience. We aim to provide a more solid basis for a science of consciousness. We argue that a theory of consciousness should provide an account of the very processes that allow us to acquire and use information about our own mental states ? the processes underlying introspection. This can be achieved through the construction of information processing models that can account for ?Type-C? processes. (...) Type-C processes can be specified experimentally by identifying paradigms in which awareness of the stimulus is necessary for an intentional action. The Shallice (1988b) framework is put forward as providing an initial account of Type-C processes, which can relate perceptual consciousness to consciously performed actions. Further, we suggest that this framework may be refined through the investigation of the functions of prefrontal cortex. The formulation of our approach requires us to consider fundamental conceptual and methodological issues associated with consciousness. The most significant of these issues concerns the scientific use of introspective evidence. We outline and justify a conservative methodological approach to the use of introspective evidence, with attention to the difficulties historically associated with its use in psychology. (shrink)

Journal of Mind and Behavior 28 no. 2 (2007), pp. 135-156. The self-prompting theory of consciousness holds that conscious perceptual experience occurs when non-routine perceptual data prompt the activation of a plan in an executive control system that monitors perceptual input. On the other hand, routine, non-conscious perception merely provides data about the world, which indicatively describes the world correctly or incorrectly. Perceptual experience instead involves data that are about the perceiver, not the world. Their (...) function is that of imperatively prompting the perceiver herself to do something (hence. (shrink)

Kant is often considered to have argued that perceptual awareness of objects in one's environment depends on the subject's possession of conceptual capacities. This conceptualist interpretation raises an immediate problem concerning the nature of perceptual awareness in non-rational, non-concept using animals. In this paper I argue that Kant’s claims concerning animal representation and consciousness do not foreclose the possibility of attributing to animals the capacity for objective perceptual consciousness, and that a non-conceptualist interpretation of Kant’s (...) position concerning perceptual awareness can actively endorse this attribution. Kant can consistently allow that animals have a point of view on the objective world which possesses a distinctive phenomenal character while denying what seems most important to him – viz. that animals have the capacity to take cognitive attitudes towards, and thus self-ascribe, their own representational states. (shrink)

Mack and Rock show evidence that no consciousperception occurs without a prior attentiveact. Subjects already executing attention taskstend to neglect visible elements extraneous tothe attentional task, apparently lacking evenbetter-than-chance ``implicit perception,''except in certain cases where the unattendedstimulus is a meaningful word or has uniquepre-tuned salience similar to that ofmeaningful words. This is highly consistentwith ``enactive'' notions that consciousnessrequires selective attention via emotional subcortical and limbic motivationalactivation as it influences anterior attentionmechanisms. Occipital activation withoutconsciousness suggests that motivated search,enacted through the organism's (...) subcorticalmotivational functions, is needed beforevisual stimulation engenders consciousness.This enactive view – that searching for,rather than receiving or processing input isthe basis of consciousness – was slow ingaining acceptance lacking empirical evidenceof this kind, combined with thestimulus-response assumption that brain eventssubserving perceptual consciousness must resultfrom transformation of perceptual input ratherthan from the organism's self-regulatedactivity as manifested through subcorticalactivity. Implicit perception occurring withword priming is ``paradoxical'' according to Mackand Rock, suggesting late selection forattention after extensive unconsciousprocessing, while most trials involvingnonverbal rather than verbal images mightsuggest earlier selection, sinceunattended objects are unseen, apparently evenimplicitly. This paper argues that anteriorand subcortical motivational mechanisms play animportant role in early selection; posteriormechanisms then unconsciously enhance signals;if data survive early gating andcorticothalamic enhancement, then still further anterior-limbic loops motivatedlyactivate ``image schemas'' resonating withposterior nonconscious processing; at thatpoint, consciousness occurs. (shrink)

What turns the continuous flow of experience into perceptually distinct objects? Can our verbal descriptions unambiguously capture what it is like to see, hear, or feel? How might we reason about the testimony that perception alone discloses? Christian Coseru proposes a rigorous and highly original way to answer these questions by developing a framework for understanding perception as a mode of apprehension that is intentionally constituted, pragmatically oriented, and causally effective. By engaging with recent discussions in phenomenology and analytic philosophy (...) of mind, but also by drawing on the work of Husserl and Merleau-Ponty, Coseru offers a sustained argument that Buddhist philosophers, in particular those who follow the tradition of inquiry initiated by Dign?ga and Dharmak?rti, have much to offer when it comes to explaining why epistemological disputes about the evidential role of perceptual experience cannot satisfactorily be resolved without taking into account the structure of our cognitive awareness. -/- Perceiving Reality examines the function of perception and its relation to attention, language, and discursive thought, and provides new ways of conceptualizing the Buddhist defense of the reflexivity thesis of consciousness-namely, that each cognitive event is to be understood as involving a pre-reflective implicit awareness of its own occurrence. Coseru advances an innovative approach to Buddhist philosophy of mind in the form of phenomenological naturalism, and moves beyond comparative approaches to philosophy by emphasizing the continuity of concerns between Buddhist and Western philosophical accounts of the nature of perceptual content and the character of perceptual consciousness. (shrink)

The NMDA receptor (NMDAR) channel has been proposed to function as a coincidence-detection mechanism for afferent and reentrant signals, supporting conscious perception, learning, and memory formation. In this paper we discuss the genesis of distorted perceptual states induced by subanesthetic doses of ketamine, a well-known NMDA antagonist. NMDAR blockage has been suggested to perturb perceptual processing in sensory cortex, and also to decrease GABAergic inhibition in limbic areas (leading to an increase in dopamine excitability). We propose that (...) class='Hi'>perceptual distortions and hallucinations induced by ketamine blocking of NMDARs are generated by alternative signaling pathways, which include increase of excitability in frontal areas, and glutamate binding to AMPA in sensory cortex prompting Ca ++ entry through voltage-dependent calcium channels (VDCCs). This mechanism supports the thesis that glutamate binding to AMPA and NMDARs at sensory cortex mediates most normal perception, while binding to AMPA and activating VDCCs mediates some types of altered perceptual states. We suggest that Ca ++ metabolic activity in neurons at associative and sensory cortices is an important factor in the generation of both kinds of perceptual consciousness. (shrink)

In the Logical Investigations, Ideas I and many other texts, Husserl maintains that perceptual consciousness involves the intentional “animation” or interpretation of sensory data or hyle, e.g., “color-data,” “tone-data,” and algedonic data. These data are not intrinsically representational nor are they normally themselves objects of representation, though we can attend to them in reflection. These data are “immanent” in consciousness; they survive the phenomenological reduction. They partly ground the intuitive or “in-the-flesh” aspect of perception, and they have (...) a determinacy of character that we do not create but can only discover. This determinate, non-representational stratum of perceptual consciousness also serves as a bridge between consciousness and the world beyond it. I articulate and defend this conception of perceptual consciousness. I locate the view in the space of contemporary positions on phenomenal character and argue for its superiority. I close by briefly arguing that the Husserlian account is perfectly compatible with physicalism (this involves disarming the Grain Problem). (shrink)

The NMDA receptor (NMDAR) channel has been proposed to function as a coincidence-detection mechanism for afferent and reentrant signals, supporting conscious perception, learning, and memory formation. In this paper we discuss the genesis of distorted perceptual states induced by subanesthetic doses of ketamine, a well-known NMDA antagonist. NMDAR blockage has been suggested to perturb perceptual processing in sensory cortex, and also to decrease GABAergic inhibition in limbic areas (leading to an increase in dopamine excitability). We propose that (...) class='Hi'>perceptual distortions and hallucinations induced by ketamine blocking of NMDARs are generated by alternative signaling pathways, which include increase of excitability in frontal areas, and glutamate binding to AMPA in sensory cortex prompting Ca++ entry through voltage-dependent calcium channels (VDCCs). This mechanism supports the thesis that glutamate binding to AMPA and NMDARs at sensory cortex mediates most normal perception, while binding to AMPA and activating VDCCs mediates some types of altered perceptual states. We suggest that Ca++ metabolic activity in neurons at associative and sensory cortices is an important factor in the generation of both kinds of perceptual consciousness. (shrink)

Perceptual and other consciousness is left out of or is not adequately characterized in naturalist accounts, including eliminative materialism and neural functionalism. We need a radically new start. Phenomenologically, if you are perceptually conscious, then a world—a changing totality of things—must somehow exist. Partly because with consciousness nothing is hidden and all can be reported without inference, perceptual consciousness itself is literally to be understood as things existing spatio-temporally. This account of consciousness as existence (...) does not reduce it to mental worlds and satisfies our conviction of the reality of consciousness—mainly we do not think of it as ethereal or gossamer. The account also explains fundamental subjectivity, as the naturalist accounts cannot, and passes a test having to do with the mind-body problem. It is a near-naturalism. The account can be defended against objections about brains in vats, chairs in minds, and leaving out consciousness. (shrink)

Recent experiments have shown that the amplitudes of cortical gamma band oscillatory activities that occur during anesthesia are often greater than amplitudes of similar activities that occur without anesthesia. This result is apparently at odds with the hypothesis that synchronized oscillatory activities constitute the neural correlate of consciousness. We argue that while synchronization and oscillatory patterning are necessary conditions for consciousness, they are not sufficient. Based on the results of a binocular rivalry study of Fries et al. (1997), (...) we propose that the degrees of oscillatory strength and synchronization of neuronal activities determine the degree of awareness those activities produce. On the other hand, the overal firing rates of neurons in cortical sensory areas are not correlated with the degree of awareness the activities of those neurons produce. The results of the experiment of Fries et al. (1997) appear to conflict with the results of another binocular rivalry experiment, in which monkeys were trained to pull a lever in order to report which stimulus object was being perceived (Leopold & Logothetis, 1996). In the latter experiment, it was demonstrated that the firing rates of neurons in striate cortex did not change during perceptual alterations, while 90% of neurons in inferior and superior temporal cortices changed their firing rate when the perceived image changed. This result led to the conclusion that activities in temporal cortex are correlated with visual awareness, but those in striate cortex are not. We argue that activities in temporal cortex contribute little, if anything, to perceptual awareness, and that their primary function is computational. Thus the correlation between the firing rates of neurons in these areas and the responses of the monkeys is due to the recognition of a particular stimulus object, which in turn is due to the computations made there. (shrink)

A satisfactory solution to the problem of consciousness would take the form of a simple yet fully general model which specifies the precise conditions under which any given state of consciousness occurs. Science has uncovered numerous correlations between consciousness and neural activity, but it has not yet come anywhere close to this. We are still looking for the Newtonian laws of consciousness. -/- One of the main difficulties with consciousness is that we lack a language (...) in which to formulate illuminating generalizations about it. Philosophers and scientists talk about "what it’s like", sensations, feelings, and perceptual states such as seeing and hearing. This language does not allow a precise articulation of the internal structures of conscious states and their inter-relations. It is inadequate to capture relations of the kind we are looking for between conscious states and physical states. -/- In this thesis I refine and defend a theory of consciousness which promises to solve this regimentation problem: the representational theory of consciousness. I argue that the representational theory can solve the regimentation problem and smooth out other important obstacles to a fruitful study of consciousness. I also make a case for the theory independently of its payoffs, and I discuss the leading opposing theories at some length. In the rest of this introduction, I will clarify what I mean by "consciousness", provide an initial characterization of the representational theory, and outline my project in more detail. (shrink)

Conscious experience is one of the most difficult and thorny problems in psychological science. Its study has been neglected for many years, either because it was thought to be too difficult, or because the relevant evidence was thought to be poor. Bernard Baars suggests a way to specify empirical constraints on a theory of consciousness by contrasting well-established conscious phenomena - such as stimulus representations known to be attended, perceptual, and informative - with closely comparable unconscious ones - (...) such as stimulus representations known to be preperceptual, unattended, or habituated. Adducing data to show that consciousness is associated with a kind of global workplace in the nervous system, and that several brain structures are known to behave in accordance with his theory, Baars helps to clarify many difficult problems. (shrink)

Locke’s theory of personal identity was philosophically groundbreaking for its attempt to establish a non-substantial identity condition. Locke states, “For the same consciousness being preserv’d, whether in the same or different Substances, the personal Identity is preserv’d” (II.xxvii.13). Many have interpreted Locke to think that consciousness identifies a self both synchronically and diachronically by attributing thoughts and actions to a self. Thus, many have attributed to Locke either a memory theory or an appropriation theory of personal identity. But (...) the former stumble on circularity and the latter is insufficient for Locke’s moral theory insofar as he is committed to a theory of divine rectification. The common problem is that Locke’s theory seems to demand an objective, or metaphysical, fact of a continuing consciousness that does not appeal to a traditional notion of substance for the continuity. I’m suggesting something new. In II.xxvii of the Essay, we see an ambiguity in Locke’s use of the term ‘consciousness’. Locke seems to see consciousness as both a mental state by means of which we are aware of ourselves as perceiving and as the ongoing self we are aware of in these conscious states. First, I make the textual argument why we should read Locke as having a conception of a metaphysical fact of a continuing consciousness that does not appeal to thinking or bodily substance to establish its continuity. I then argue that the metaphysical fact of an enduring consciousness is revealed to us as a phenomenological fact of experience. Due to the nature of certain kinds of perceptual situations we have an experience of ourselves as temporally extended. Although the text bears out that Locke seemed to think there is a fact of an ongoing consciousness, I argue that it is consistent with his reluctance elsewhere that he makes no further epistemological or ontological claims about it. Finally, I provide an account of Locke’s understanding of memory and its relation to consciousness that supports the claim that consciousness is something ontologically distinct from either thinking or bodily substance. (shrink)

Consciousness has a number of puzzling features. One such feature is its unity: the experiences and other conscious states that one has at a particular time seem to occur together in a certain way. I am currently enjoying visual experiences of my computer screen, auditory experiences of bird-song, olfactory experiences of coffee, and tactile experiences of feeling the ground beneath my feet. Conjoined with these perceptual experiences are proprioceptive experiences, experiences of agency, affective and emotional experiences, and conscious (...) thoughts of various kinds. These experiences are unified in a variety of ways, but the kind of unity that I’m interested in here concerns their phenomenal character. Take just two of these experiences: the sound of bird-song and the smell of coffee. There is something it is like to have the auditory experience, there is something it is like to have the olfactory experience, and there is something it is like to have both the auditory and olfactory experiences together. These two experiences occur as parts or components or aspects of a larger, more complex experience. And what holds of these two experiences seems to hold – at least in normal contexts – of all of one’s simultaneous experiences: they seem to be subsumed by a single, maximal experience.2 We could think of this maximal experience as an experiential perspective on the world. What it is like to be me right now is (or involves) an extremely complex conscious state that subsumes the various simpler experiences that I outlined above (seeing my computer screen, hearing bird-song, smelling coffee, and so on). I will follow recent literature in using the term “co-consciousness” for the relation that a set of conscious states bear to each other when they have a complex phenomenology (Bayne and Chalmers 2003; Dainton 2000; Hurley 1998; Lockwood 1989). (shrink)

In this paper, a theoretical account of the functional role of consciousness in the cognitive system of normal subjects is developed. The account is based upon an approach to consciousness that is drawn from the phenomenological tradition. On this approach, consciousness is essentially peripheral self-awareness, in a sense to be duly explained. It will be argued that the functional role of consciousness, so construed, is to provide the subject with just enough information about her ongoing experience (...) to make it possible for her to easily obtain as much information as she may need. The argument for this account of consciousness' functional role will proceed in three main stages. First, the phenomenological approach to consciousness as peripheral self-awareness will be expounded and endorsed. Second, an account of the functional role of peripheral perceptual awareness will be offered. Finally, the account of the functional role of peripheral self-awareness will be obtained by straightforward extension from the functional role of peripheral perceptual awareness. (shrink)

"Consciousness" is a multiply ambiguous word, and if our goal is to explain perceptual consciousness we had better be clear about which of the many senses of the word we are endorsing when we sign on to the project. I describe some of the relatively standard distinctions made in the philosophical literature about different meanings of the word "conscious". Then I consider some of the arguments of David Chalmers and of Ned Block that states of "phenomenal (...) class='Hi'>consciousness" pose special and intractable problems for the scientific understanding of perception. I argue that many of these problems are introduced by obscurities in the term itself, and propose a distinction between epistemic and non-epistemic senses of the term "phenomenal consciousness". That distinction helps explain why phenomenal consciousness seems so mysterious to so many people. States of "phenomenal consciousness" are not states of one, elemental (and inexplicable) kind; they are a ragtag lot, of differing levels of complexity, corralled under one heading by a regrettable ambiguity in our terminology. (shrink)

There is not a uniform kind of consciousness common to all conscious mental states: beliefs, emotions, perceptual experiences, pains, moods, verbal thoughts, and so on. Instead, we need a distinction between phenomenal and nonphenomenal consciousness. As if consciousness simpliciter were not mysterious enough, philosophers have recently focused their worries on phenomenal (or qualitative) consciousness, the kind that explains or constitutes there being "something it.

According to Uriah Kriegel’s self-representational theory of consciousness, mental state M is conscious just in case it is a complex with suitably integrated proper parts, M1 and M2, such that M1 is a higher-order representation of lower-order representation M2. Kriegel claims that M thereby “indirectly” represents itself, and he attempts to motivate this claim by appealing to what he regards as intuitive cases of indirect perceptual and pictorial representation. For example, Kriegel claims that it’s natural to say that (...) in directly perceiving the front surface of an apple one thereby perceives the apple itself. Cases such as this are supposed to provide intuitive support for the principle that if X represents Y, and Y is highly integrated into complex object Z, then X indirectly represents Z. In this paper I provide counterexamples to Kriegel’s principle of indirect representation, before going on to argue that we can explain what is going on in those cases in which the subject seems to represent a complex whole by representing one its parts without positing indirect representations anyway. I then argue that my alternative approach is superior to Kriegel’s in a number of ways, thereby rendering his theory of consciousness implausible. (shrink)

What sort of thing is the mind? And how can such a thing at the same time - belong to the natural world, - represent the world, - give rise to our subjective experience, - and ground human knowledge? Content, Consciousness and Perception is an edited collection, comprising eleven new contributions to the philosophy of mind, written by some of the most promising young philosophers in the UK and Ireland. The book is arranged into three parts. Part I, Concepts (...) and Mental Content , which begins with an attack by Hans-Johann Glock on the representational theory of mind, addresses the nature of mental representation. Part II, Consciousness and the Metaphysics of Mind , concerns the prospects for a naturalistic metaphysics of the conscious mind. Finally, Part III, entitled Perception , pursues the project of giving a satisfactory philosophical account of perceptual experience. The book begins with an introductory essay by the editors, which provides an overview of the state of contemporary philosophy of mind, locating the articles to follow within that context. The individual chapters of Content, Consciousness and Perception are professional contributions to their respective areas, of interest to any philosopher of mind. The volume as a whole is ideal for non-specialists and students interested in getting to grips with the state of the art in contemporary philosophy of mind. -/- Praise for the book: 'If you want to know what the next but one generation of philosophers of mind are thinking about now, *Content, Consciousness and Perception* is a terrific place to look. This wide-ranging international collection is relevant to psychologists and cognitive scientists as well as philosophers.' Tim Williamson Wykeham Professor of Logic at Oxford University. (shrink)

Machine generated contents note: -- 1. Introduction -- Consciousness and Sensorimotor Dynamics: Methodological Issues -- 2. Computational consciousness, D. Ballard -- 3. Explaining what people say about sensory qualia, J. Kevin O'Regan -- 4. Perception, action, and experience: unraveling the golden braid, A. Clark -- The Two-Visual Systems Hypothesis -- 5. Cortical visual systems for perception and action, A.D. Milner and M.A. Goodale -- 6. Hermann Lotze's Theory of 'Local Sign': evidence from pointing responses in an (...) illusory figure, D.R. Melmoth -- Understanding Agency and Object Perception -- 7. Two visual systems and the feeling of presence, M. Matthen -- 8. Spatial coordinates and phenomenology in the two-visual systems model, P. Jacob and F. de Vignemont -- 9. Perceptual experience and the capacity to act, S. Schellenberg -- Perception and Action: Studies in Cognitive Neuroscience -- 10. Why does the perception-action functional dichotomy not match the ventral-dorsal streams in anatomical segregation: optic ataxia and the function of the dorsal stream, Y. Rossetti et al -- 11. Mapping the neglect syndrome onto neurofunctional streams, G. Vallar and F. Mancini -- 12. Motor representations and the perception of space: perceptual judgments of the boundary of action space, Y. Delevoye-Turrell -- The Role of Action and Sensorimotor Knowledge in Sensorimotor Theories of Perception -- 13. Vision without representation, A. Noe -- 14. Sensorimotor knowledge and the contents of experience, J. Kiverstein -- Boundaries of the Agent -- 15. Extended vision, R. A. Wilson. (shrink)

This paper explores the distinction between perceiving an object as extended in time, and experiencing a sequence of perceptions. I argue that this distinction cannot be adequately described by any present theory of time-consciousness and that in order to solve the puzzle, we need to consider perceptual content as having three distinct constituents: Explicit content, which has a particular phenomenal character, modal content, or the kind of content that is contributed by the psychological mode, and implicit content, which (...) lacks phenomenal character. These notions are then further clarified and related to each other. (shrink)

It has been over a decade and half since Christof Koch and the late Francis Crick first advocated the now popular NCC project (Crick and Koch, 1990), in which one tries to find the neural correlate of consciousness (NCC) for perceptual processes. In his chapter in this book Chris Frith provides a splendid review of how neuroimaging has contributed greatly to this project. For the sake of contrast, this chapter takes a more critical stance on what we have (...) actually learned. Many authors have written on whether looking for the neural correlates would eventually lead to an explanatory theory of consciousness, while the proponents defend that focusing on correlates is a strategically sensible first step, given the complexity of the problem (Crick and Koch, 1998;Crick and Koch, 2003). My point here is not to argue whether studying the NCC is useful, but rather, to question whether we are really studying the NCC at all. I argue that in hoping to sidestep the difficult conceptual issues, we have sometimes also missed the phenomenon of perceptual consciousness itself. (shrink)

Dualist and Reductionist theories of mind disagree about whether or not consciousness can be reduced to a state of or function of the brain. They assume, however, that the contents of consciousness are separate from the external physical world as-perceived. According to the present paper this assumption has no foundation either in everyday experience or in science. Drawing on evidence for perceptual projection in both interoceptive and exteroceptive sense modalities, the case is made that the physical world (...) as-perceived is a construct of perceptual processing and, therefore, part of the contents of consciousness. A finding which requires a Reflexive rather than a Dualist or Reductionist model of how consciousness relates to the brain and the physical world. The physical world as-perceived may, in turn be thought of as a biologically useful model of the world as described by physics. Redrawing the boundaries of consciousness to include the physical world as-perceived undermines the conventional separation of the 'mental' from the physical', and with it the very foundation of the Dualist-Reductionist debate. The alternative Reflexive model departs radically from current conventions, with consequences for many aspects of consciousness theory and research. Some of the consequences which bear on the internal consistency and intuitive plausibility of the model are explored, e.g. the causal sequence in perception, representationalism, a suggested resolution of the Realism versus Idealism debate, and the way manifest differences between physical events as-perceived and other conscious events (images, dreams, etc.) are to be construed. In the present paper I wish to challenge some of our most deeply-rooted assumptions about what consciousness is, by re-examining how consciousness, the human brain, and the surrounding physical world relate to each other. (shrink)

The control of action has traditionally been described as "automatic". In particular, movement control may occur without conscious awareness, in contrast to normal visual perception. Studies on rapid visuomotor adjustment of reaching movements following a target shift have played a large part in introducing such distinctions. We suggest that previous studies of the relation between motor performance and perceptual awareness have confounded two separate dissociations. These are: (a) the distinction between motoric and perceptual representations, and (b) an orthogonal (...) distinction between conscious and unconscious processes. To articulate these differences more clearly, we propose a new measure of motor awareness, based on subjects' ability to reproduce the spatial details of reaching movements they have just made. Here we focus on the dissociation between motor awareness and perceptual awareness that may occur when subjects make rapid visuomotor adjustments to reaching movements following a target shift. In experiment 1, motor awareness was dissociated from perceptual awareness of a target shift during reaching movement. Participants' reproduction of movement endpoints following visuomotor adjustment was independent of whether they saw the target shift or not. Experiment 2 replicated this result, and further showed that neither motor awareness nor motor performance were disrupted by TMS over the parietal cortex. The neural mechanisms underlying motor awareness, and the implications for theories of consciousness, are discussed. (shrink)

David Papineau’s Thinking About Consciousness tells a skillful, inventive, and plausible story about why, given that the phenomenal character of conscious experience is an unproblematically physical property, we continue to suffer from “intuitions of dualism”. According to Papineau, we are misled by the peculiar structure of the phenomenal concepts we use to introspect upon that phenomenal character. Roughly: unlike physical concepts, phenomenal concepts exemplify the kind of experience they are concepts of; and this creates the mistaken impression that the (...) physical concepts leave something out. I find much of Papineau’s account congenial, though I have some questions about his characterization of phenomenal concepts. I will take up two of these questions here. On Papineau’s view, phenomenal concepts are mental terms that are formed by concatenating an experience operator, namely ‘the experience: —’, together with “an actual state of… perceptual classification” (115). The latter state, itself an experience, fills the blank in the experience operator; and the concept thus formed refers to the type of experience whose instances are relevantly similar to that perceptual filling.1 Papineau writes. (shrink)

We argue that Graziano and Kastner are mistaken to claim that neglect favors their self-directed social perception account of consciousness. For the latter should not predict that neglect would result from damage to mechanisms of social perception. Neglect is better explained in terms of damage to attentional mechanisms.

Can consciousness and the human mind be understood and explained in sheerly physical terms? Materialism is a philosophical/scientific theory, according to which the mind is completely physical. This theory has been around for literally thousands of years, but it was always stymied by its inability to explain how exactly mere matter could do the amazing things the mind can do. Beginning in the 1980s, however, a revolution began quietly boiling away in the neurosciences, yielding increasingly detailed theories about how (...) the brain might accomplish consciousness. Nevertheless, a fundamental obstacle remains. Contemporary research techniques seem to still have the scientific observer of the conscious state locked out of the sort of experience the subjects themselves are having. Science can observe, stimulate, and record events in the brain, but can it ever enter the most sacred citadel, the mind? Can it ever observe the most crucial properties of conscious states, the ones we are aware of? If it can't, this creates a problem. If conscious mental states lack a basic feature possessed by all other known physical states, i.e., the capability to be observed or experienced by many people, this give us reason to believe that they are not entirely physical. -/- In this intriguing book, William Hirstein argues that it is indeed possible for one person to directly experience the conscious states of another, by way of what he calls mindmelding. This would involve making just the right connections in two peoples' brains, which he describes in detail. He then follows up the many other consequences of the possibility that what appeared to be a wall of privacy can actually be breached. -/- Drawing on a range of research from neuroscience and psychology, and looking at executive functioning, mirror neuron work, as well as perceptual phenomena such as blind-sight and filling-in, this book presents a highly original new account of consciousness. (shrink)

Fred Dretske asserts that the conscious or phenomenal experiences associated with our perceptual states—e.g. the qualitative or subjective features involved in visual or auditory states—are identical to properties that things have according to our representations of them. This is Dretske's version of the currently popular representational theory of consciousness . After explicating the core of Dretske's representational thesis, I offer two criticisms. I suggest that Dretske's view fails to apply to a broad range of mental phenomena that have (...) rather distinctive subjective or qualitative features. I also suggest that Dretske's view, in identifying conscious experiences with features of our perceptual states, casts its aim too low. It deflates further than it should and, in consequence, fails to capture what are arguably some of the most important phenomena associated with our conscious lives. (shrink)

To further illuminate the nature of conscious states, it may be progressive to integrate Merker's important contribution with what is known regarding (a) the temporal relation between conscious states and activation of the mesodiencephalic system; (b) the nature of the information (e.g., perceptual vs. premotor) involved in conscious integration; and (c) the neural correlates of olfactory consciousness. (Published Online May 1 2007).

Editors’ note: These four interrelated discussions of the role of the cerebellum in coordinating emotional and higher cognitive functions developed out of a workshop presented by the four authors for the 2000 Conference of the Cognitive Science Society at the University of Pennsylvania. The four interrelated discussions explore the implications of the recent explosion of cerebellum research suggesting an expanded cerebellar role in higher cognitive functions as well as in the coordination of emotional functions with learning, logical thinking, perceptual (...) consciousness, and action planning. (shrink)

Abstract The language of consciousness and that of brain function seem vastly different and incommensurable ways of approaching human mental life. If we look at what we mean by consciousness we find that it has a great deal to do with the sensitivity and responsiveness shown by a subject toward things that happen. Philosophically, we can understnd ascriptions of consciousness best by looking at the conditions which make it true for thinkers who share the concept to say (...) that one of them is conscious. This depends on consciousness being manifest. When we also note that manifest, flexible and exploratory responses to one's environment are the basis of concept use, an a priori link between concepts and consciousness is forged. The brain structures subserving such responses are complex but crucially involve the multi?tracked and cross?linked information processing to be found in the neocortex. This function draws on the motivational and orienting activity arising in lower brain systems but orchestrates that into an articulated structure of behaviour control. The conclusion is that human consciousness is an umbrella term for complex and animated mental activity which makes extensive use of many different perceptual systems and also of the social milieu within which human cognition develops. (shrink)

What is consciousness? How does the subjective character of consciousness fit into an objective world? How can there be a science of consciousness? In this sequel to his groundbreaking and controversial The Conscious Mind, David Chalmers develops a unified framework that addresses these questions and many others. Starting with a statement of the "hard problem" of consciousness, Chalmers builds a positive framework for the science of consciousness and a nonreductive vision of the metaphysics of (...) class='Hi'>consciousness. He replies to many critics of The Conscious Mind, and then develops a positive theory in new directions. The book includes original accounts of how we think and know about consciousness, of the unity of consciousness, and of how consciousness relates to the external world. Along the way, Chalmers develops many provocative ideas: the "consciousness meter", the Garden of Eden as a model of perceptual experience, and The Matrix as a guide to the deepest philosophical problems about consciousness and the external world. This book will be required reading for anyone interested in the problems of mind, brain, consciousness, and reality. (shrink)

Kant was the first great anti-Cartesian in epistemology and philosophy of mind. He criticised five central tenets of Cartesianism and developed sophisticated alternatives to them. His transcendental analysis of the necessary a priori conditions for the very possibility of self-conscious human experience invokes externalism about justification and proves externalism about mental content. Semantic concern with the unity of the proposition—required for propositionally structured awareness and self-awareness—is central to Kant’s account of the unity of any cognitive judgment. The perceptual ‘binding (...) problem’ is central to Kant’s account of the unity of the object in perception. This paper outlines Kant’s development and justification of his a rationalist account of our active intellect and its roles in perceptual consciousness and in rational judgment, including our consciousness of our rational freedom, all through a radically innovative transcendental inquiry into the necessary a priori conditions for us to be conscious at all. Kant’s anti-Cartesianism is a major philosophical breakthrough far surpassing contemporary anti-Cartesian efforts. It behoves us to give Kant his due and avail ourselves of his profound insights into the nature of human mindedness. (shrink)

The focus of this paper will be on the problem of perceptual presence and on a solution to this problem pioneered by Kant [1781; 1783] and refined by Sellars [Sellars, 1978] and Strawson [Strawson, 1971]. The problem of perceptual presence is that of explaining how our perceptual experience of the world gives us a robust sense of the presence of objects in perception over and above those sensory aspects of the object given in perception. Objects possess (...) other properties which are, one might say, phenomenologically present even though they are admittedly sensorily absent. The general form of the solution to this problem that Kant developed seems to me to be a neglected resource in contemporary work on perceptual consciousness. Kant solves the problem of perceptual presence by appealing to that which he called the productive use of the imagination. This faculty of mind supplies schematic representations of the object of perception that explains a phenomenological sense of perceptual presence even of those features that are not, in a sense to be further clarified,. (shrink)

The fascination of Velasquez's painting Las Meninas stems largely from the ambiguous relationship between the painting as a whole, viewed by a single perceiver, and the variety of different perceptual viewpoints it invites. This situation resonates strongly with a central puzzle in the study of consciousness: the apparent unity of perceptual experience despite multiple sense modalities. Understanding more of this latter might help to explain the way we respond to the painting.

One of the more refractory problems in contemporary discussions of consciousness is the problem of determining what a mental state's being conscious consists in. This paper defends the thesis that a mental state is conscious if and only if it has a certain reflexive character, i.e., if and only if it has a structure that includes an awareness of itself. Since this thesis finds one of its clearest expressions in the work of Brentano, it is his treatment of the (...) thesis on which I initially focus, though I subsequently bring in Sartre where he addresses himself to an important point not considered by Brentano. As part of this investigation, the paper also, more specifically, aims to exhibit as perspicuously as possible the relationship between self-awareness and the phenomenal, or 'what-it- is-like', dimension of conscious experience. I attempt to show, in particular, that the phenomenal character of at least perceptual consciousness can be fully explained in terms of self-awareness, i.e., in terms of a low-level or 'implicit' self-awareness that is built into every conscious perceptual state. (shrink)

All representationalists maintain that there is a necessary connection between an experience’s phenomenal character and intentional content; but there is a disagreement amongst representationalists regarding the nature of those intentional contents that are necessarily connected to phenomenal character. Russellian representationalists maintain that the relevant contents are composed of objects and/or properties, while Fregean representationalists maintain that the relevant contents are composed of modes of presentation of objects and properties. According to Fregean representationalists such as David Chalmers and Brad Thompson, the (...) Fregean variety of the view is preferable to the Russellian variety because the former can accommodate purported counterexamples involving spectrum inversion without illusion and colour constancy while the latter cannot. I maintain that colour constancy poses a special problem for the Fregean theory in that the features of the theory that enable it handle spectrum inversion without illusion cannot be extended to handle colour constancy. I consider the two most plausible proposals regarding how the Fregean view might be developed in order to handle colour constancy—one of which has recently been defended by Thompson (Australas J Philos 87:99–117, 2009)—and argue that neither is adequate. I conclude that Fregean representationalism is no more able to accommodate colour constancy than is Russellian representationalism and, as such, ought to be rejected. (shrink)

Cognitive functions like perception, memory, language, or consciousness are based on highly parallel and distributed information processing by the brain. One of the major unresolved questions is how information can be integrated and how coherent representational states can be established in the distributed neuronal systems subserving these functions. It has been suggested that this so-called ''binding problem'' may be solved in the temporal domain. The hypothesis is that synchronization of neuronal discharges can serve for the integration of distributed neurons (...) into cell assemblies and that this process may underlie the selection of perceptually and behaviorally relevant information. As we intend to show here, this temporal binding hypothesis has implications for the search of the neural correlate of consciousness. We review experimental results, mainly obtained in the visual system, which support the notion of temporal binding. In particular, we discuss recent experiments on the neural mechanisms of binocular rivalry which suggest that appropriate synchronization among cortical neurons may be one of the necessary conditions for the buildup of perceptual states and awareness of sensory stimuli. (shrink)

Machine consciousness exists already in organic systems and it is only a matter of time -- and some agreement -- before it will be realised in reverse-engineered organic systems and forward- engineered inorganic systems. The agreement must be over the preconditions that must first be met if the enterprise is to be successful, and it is these preconditions, for instance, being a socially-embedded, structurally-coupled and dynamic, goal-directed entity that organises its perceptual input and enacts its world through the (...) application of both a cognitive and kinaesthetic imagination, that I shall concentrate on presenting in this paper. It will become clear that these preconditions will present engineers with a tall order, but not, I will argue, an impossible one. After all, we might agree with Freeman and Núñez's claim that the machine metaphor has restricted the expectations of the cognitive sciences (Freeman & Núñez, 1999); but it is a double-edged sword, since our limited expectations about machines also narrow the potential of our cognitive science. (shrink)

It has been over a decade and half since Christof Koch and the late Francis Crick first advocated the now popular NCC project (Crick and Koch, 1990), in which one tries to find the neural correlate of consciousness (NCC) for perceptual processes. Here we critically take stock of what have actually been learned from these studies. Many authors have questioned whether looking for the neural correlates would eventually lead to an explanatory theory of consciousness, while the proponents (...) of NCC research maintain that focusing on correlates is a strategically sensible first step, given the complexity of the problem (Crick and Koch, 1998;Crick and Koch, 2003). My point here is not to argue whether studying the NCC is useful, but rather, to question whether we are really studying the NCC at all. I argue that in hoping to sidestep the difficult conceptual issues, we have sometimes also missed the phenomenon of perceptual consciousness itself. (shrink)

This article combines the disciplines of textual/linguistic analysis, anthropology, and perceptual psychology to examine selected ancient Jewish mystical texts that claim to describe the praxis for ascents into heaven and encounters with angelic spirits in order to reconstruct the psychosocial context of these literary works. Specifically, the article examines Hekhalot or "Divine Palaces" texts that deal with hydromancy, giving attention to their mythic–symbolic assumptions, their described preparatory and triggering rituals, and their accounts of the ASC (altered states of (...) class='Hi'>consciousness) visions resulting from these rituals that are experienced by the practitioners. The article suggests that these accounts correlate with ASC practices identified in the literature and additionally suggests that although the mystical texts are written to resemble biblical accounts of revelatory experiences, the texts under consideration are more than works of fabulous imagination; they are literary artifacts of an actual ecstatic ASC praxis among the Jews of Late Antiquity. (shrink)