Working memory, an important posit in cognitive science, allows one to temporarily store and manipulate information in the service of ongoing tasks. Working memory has been traditionally classified as an explicit memory system – that is, as operating on and maintaining only consciously perceived information. Recently, however, several studies have questioned this assumption, purporting to provide evidence for unconscious working memory. In this paper, we focus on visual working memory and critically examine these studies as well as studies of unconscious (...) perception that seem to provide indirect evidence for unconscious working memory. Our analysis indicates that current evidence does not support an unconscious working memory store, though we offer independent reasons to think that working memory may operate on unconsciously perceived information. (shrink)

In this paper we discuss the two-system framework, examine its strengths, point out a fundamental weakness concerning the unity of conscious experience, and then propose a new hypothesis that avoids that weakness and other related concerns. According to our strong emergence hypothesis, what emerges are not merely mental properties in specialized, distributed neural areas, but also a new, irreducibly singular entity that functions in a recurrent manner to integrate its mental properties and to rewire its brain. We argue that the (...) former function is suggested, in part, by the effects of anesthetics on sensory integration, and that the latter function is suggested by evidence garnered from the neuroscience of mindfulness, constraint-induced movement therapy for stroke, and neuroimaging data surrounding mental illness. We then discuss how our strong emergence hypothesis relates to the description and treatment of neuropsychiatric disorders. Finally, potential objections are addressed. (shrink)

I argue (1) that Searle's reductive stance about mental causation is unwarranted on evolutionary, logical, and neuroscientific grounds; and (2) that his theory of weak emergence, called biological naturalism, fails to provide a satisfactory account of objectual unity and subject unity. Finally I propose a stronger variety of emergence called emergent subject dualism (ESD) to fill the gaps in Searle's account, and support ESD on grounds of recent evidence in neuroscience. Hence I show how it is possible, if not also (...) theoretically preferable, to go from Searle's biological naturalism to emergent subject dualism. (shrink)

Recent findings in neuroscience strongly suggest that an object’s features (e.g., its color, texture, shape, etc.) are represented in separate areas of the visual cortex. Although represented in separate neuronal areas, somehow the feature representations are brought together as a single, unified object of visual consciousness. This raises a question of binding: how do neural activities in separate areas of the visual cortex function to produce a feature-unified object of visual consciousness? Several prominent neuroscientists have adopted neural synchrony and attention-based (...) approaches to explain object feature binding. I argue that although neural synchrony and attentional mechanisms might function to disambiguate an object’s features, it is difficult to see how either of these mechanisms could fully explain the unity of an object’s features at the level of visual consciousness. After presenting a detailed critique of neural synchrony and attention-based approaches to object feature binding, I propose interactive hierarchical structuralism (IHS). This view suggests that a unified percept (i.e., a feature-unified object of visual consciousness) is not reducible to the activity of any cognitive capacity or to any localized neural area, but emerges out of the interaction of visual information organized by spatial structuring capacities correlated with lower, higher, and intermediate levels of the visual hierarchy. After clarifying different notions of emergence and elaborating evidence for IHS, I discuss how IHS can be tested through transcranial magnetic stimulation and backward masking. In the final section I present some further implications and advantages of IHS. (shrink)

I propose an Aristotelian approach to agent causation that is consistent with the hypothesis of strong emergence. This approach motivates a wider ontology than materialism by maintaining (1) that the agent is generated by the brain without being reducible to it on grounds of the unity of experience and (2) that the agent possesses (formal) causal power to affect (i.e., mold, sculpt, or organize) the brain on grounds of agent-directed neuroplasticity. After providing recent empirical evidence for the strong emergence of (...) the agent, I then articulate and analyze a dominant objection to agent causation discussed in neuroscience, which is based upon the observation of the readiness potential (or RP) in the brain. In this context, the RP refers to unconscious neuronal events (in the supplementary motor area) that precede the formation of a (proximal) conscious intention to act. So it appears as if the train of neuronal events has left the depot before the agent can act. In response to this objection, I argue (a) that even if one were to grant that the RP precedes the formation of a conscious intention, it would not follow (on both logical and empirical grounds) that there is no conscious agent causation; and (b) that the objection disappears when one takes into account distal versus proximal intentions. (shrink)

A central issue in philosophy and neuroscience is the problem of unified visual consciousness. This problem has arisen because we now know that an object's stimulus features (e.g., its color, texture, shape, etc.) generate activity in separate areas of the visual cortex (Felleman & Van Essen, 1991). For example, recent evidence indicates that there are very few, if any, neural connections between specific visual areas, such as those that correlate with color and motion (Bartels & Zeki, 2006; Zeki, 2003). So (...) how do unified objects arise in visual consciousness? Some neuroscientists propose that neural synchrony is the mechanism that binds an object's features into a unity (e.g., see Crick, 1994; Crick & Koch, 1990; Engel, 2003; Roelfsema, 1998; Singer, 1996; von der Malsburg, 1996, 1999). I argue, on both empirical and philosophical grounds, that neural synchrony fails to explain the unity of visual consciousness. (shrink)

Philosophical (p-) zombies are constructs that possess all of the behavioral features and responses of a sentient human being, yet are not conscious. P-zombies are intimately linked to the hard problem of consciousness and have been invoked as arguments against physicalist approaches. But what if we were to invert the characteristics of p-zombies? Such an inverse (i-) zombie would possess all of the behavioral features and responses of an insensate being yet would nonetheless be conscious. While p-zombies are logically possible (...) but naturally improbable, an approximation of i-zombies actually exists: individuals experiencing what is referred to as “anesthesia awareness.” Patients under general anesthesia may be intubated (preventing speech), paralyzed (preventing movement), and narcotized (minimizing response to nociceptive stimuli). Thus, they appear—and typically are—unconscious. In 1-2 cases/1000, however, patients may be aware of intraoperative events, sometimes without any objective indices. Furthermore, a much higher percentage of patients (22% in a recent study) may have the subjective experience of dreaming during general anesthesia. P-zombies confront us with the hard problem of consciousness—how do we explain the presence of qualia? I-zombies present a more practical problem—how do we detect the presence of qualia? The current investigation compares p-zombies to i-zombies and explores the “hard problem” of unconsciousness with a focus on anesthesia awareness. (shrink)

I explicate the Churchland's dualistic interaction and neural dependence objections to Cartesian dualism and argue that Aquinas’s conception of Aristotelian hylomorphism provides a way out of those objections. -/- .

We provide a critique of the usual functionalist, cognition-first reading of Aristotle’s theory of emotion and then offer an alternative understanding of Aristotle's theory of cognition and emotion that brings to bear certain biological considerations evidenced in his arguments on the integration of form and matter (hylomorphism) and the hierarchical organization of the biological world. This, of course, does not suggest that we are critical of all varieties of functionalism, but only those which fail to utilize and incorporate findings in (...) neuroscience. One way to help bridge the gap between mind and the physical world is through empirical findings. Based upon our new reading of Aristotle, we identify affinities with contemporary research in the cognitive neuroscience of emotion and developmental research on emotion. (shrink)

I argue on the basis of recent findings in neuroscience that consciousness is not a brain process, and then explore some alternative, non-reductive options concerning the metaphysical relationship between consciousness and the brain, such as weak and strong accounts of the emergence of consciousness and the constitution view of consciousness. I propose an Aristotelian account of the strong emergence of consciousness. This account motivates a wider ontology than reductive physicalism and makes reference to formal causation as a way explaining the (...) causal power of consciousness. What is meant by formal causation, in thiscontext, is that consciousness has the causal power to organize or control neuronal activity. This notion of causation is elaborated and supported by recent findings in the neurosciences. An advantage of this empirically informed approach is that proponents of the irreducibility of consciousness no longer need to rely upon conceptually based arguments alone, but can build a case against reductive physicalism that has a significant empirical foundation. (shrink)

Consciousness, Awareness, and Anesthesia is a multidisciplinary approach to both the scientific problem of consciousness and the clinical problem of awareness during general anesthesia.

I argue that Augustine's concept of time implies that the continuity of temporal experience is not adequately explainable in physical terms and that persons (or at least a core component of persons) are enduring substances rather than perduring wholes composed of suitably related physical parts. In the latter part of the essay, I suggest that an enduring account of persons is in some important respects explanatorily better than some contemporary varieties of the perduring account of persons.

The essays in this special issue focus on connecting the relevant aspects of Lowe’s metaphysics to issues in philosophical theology. In this regard, the essays focus on Trinity, divine causal agency, atonement, embodied existence, physicalism vs. dualism, natural science, and theological claims.

I argue that recent empirical investigations reveal new problems and new evidence that should compel advocates of causal functionalism (of the sort defended by David Armstrong and David Lewis) to reconsider the feasibility of their account of mind.

Examining the literature on Aristotelian psychology can leave one with the impression that his theory of perception and emotion is credible primarily because it accords with contemporary functionalism, a physicalist theory that has achieved orthodoxy in contemporary philosophy of mind. In my view, squeezing Aristotle into a functionalist mold is a mistake, for functionalism entaiIs at least two theses that Aristotle would reject: (1) that material types make no essential difference to perception and emotion (and to mental states in general), (...) and (2) that mental states are reducible to functional states of matter (a reductionism of the token-specific sort). Against these functionalist theses, Aristotle would include within his analysis of human perception and emotion (and other psychological activities) the biological material and the characteristic operations associated with it. Although Aristotle would insist that this biological material makes an essential difference to conscious experience, conscious experience is not reducible to its biological basis. I defend the positions that Aristotle’s philosophy of perception and emotion is not compatible with contemporary functionalism and that conscious experience of perception and emotion is irreducible to its essential biological basis. (shrink)

After providing a critique of Andreas Engel's neural mechanistic approach to object feature binding (OFB), I develop a Kantian approach to OFB that bears affinity with recent findings in cognitive psychology. I also address the diachronic object unity (DOU) problem and discuss the shortcomings of a purely neural mechanistic approach to this problem. Finally, I motivate a Kantian approach to DOU which suggests that DOU requires the persisting character of the cognizing subject. If plausible, the cognizing subject could make an (...) explanatory contribution to our theory of unified consciousness and thus could not be eliminated on parsimonious grounds alone. (shrink)

I examine several leading neuronal accounts of binding and conclude that, while those neuronal accounts might be necessary in some important senses (e.g., when it comes to error minimization), they fail to provide satisfying solutions to the hard problems of unified experience. I then present a new, testable hypothesis called emergent subject dualism to account for the unity of experience across modalities of the brain.

We pose a foundational problem for those who claim that subjects are ontologically irreducible, but causally reducible (weak emergence). This problem is neuroscience’s notorious binding problem, which concerns how distributed neural areas produce unified mental objects (such as perceptions) and the unified subject that experiences them. Synchrony, synapses and other mechanisms cannot explain this. We argue that this problem seriously threatens popular claims that mental causality is reducible to neural causality. Weak emergence additionally raises evolutionary worries about how we’ve survived (...) the perils of nature. Our emergent subject hypothesis (ESH) avoids these shortcomings. Here, a singular, unified subject acts back on the neurons it emerges from and binds sensory features into unified mental objects. Serving as the mind’s controlling center, this subject is ontologically and causally irreducible (strong emergence). ESH draws on recent experimental evidence, including the motivation of a possible correlate (or “seat”) of the subject, which enhances its testability. (shrink)

I argue that Van der Velde and I agree on two fundamental issues surrounding the vision-related binding problem and recent solutions that have been offered: (1) that tagging theories fail to account for object feature binding in visual consciousness and (2) that feedforward-feedback processes in the visual cortical hierarchy play a role in generating a feature-unified object of visual consciousness. Van der Velde develops and discusses an important objection to tagging theories that could help to strengthen my critique of neuronal (...) synchrony (and other tagging theories) and then argues that the cognitive subject makes no explanatory contribution to the unity of an object’s features in visual consciousness. These issues are discussed in turn. By contrast, Van Leeuwen takes a more critical approach to my target article. A two-fold response to Van Leeuwen is offered: first, the root of Van Leeuwen’s perplexity is uncovered and then some specific objections that Van Leeuwen poses to my critique of neuronal synchrony, as a purported solution of the object feature binding problem, are addressed. (shrink)

We refute three key claims against dualism: (1) the claim that dualism implies that we would not expect to observe such a radical causal dependence of our conscious lives on the physical world, which is what we do observe; (2) the claim that dualism implies mysteries beyond necessity, and hence that dualism is, theoretically speaking, less simple than physicalism; and (3) that dualism implies a metaphysical simple (e.g., a human soul) is incapable of undergoing a process of development. We conclude (...) by arguing that based on the underlying preferences of scientific thought, dualism is currently the most scientifically feasible account on offer with respect to subjective experience. (shrink)

Advocates of eliminative materialism (EM) assure us that our current, ordinary approach to describing the mind will eventually be eliminated, instead of reduced, by a matured neuroscience. However, once we take into account the flexibility, explanatory power, and overall sophistication of ordinary language, then the promissory note offered by eliminative materialism loses all credibility. To bolster the preceding claim, we present three original problems for EM: the accountability problem, the substitution problem, and the discourse dependence problem.