Infants can anticipate the future location of a moving object and execute a predictive reach to intercept the object. When a moving object is temporarily hidden by darkness or occlusion, 6‐month‐old infants’ reaching is perturbed, but performance on darkness trials is significantly better than occlusion trials. How does this reaching behavior change over development? Experiment 1 tested predictive reaching of 6‐ and 9‐month‐old infants. While there was an increase in the overall number of reaches with increasing age, there (...) were significantly fewer predictive reaches during the occlusion compared to visible trials and no age‐related changes in this pattern. The decrease in performance found in Experiment 1 is likely to apply not only to the object representations formed by infants but also those formed by adults. In Experiment 2 we tested adults with a similar reaching task. Like infants, the adults were most accurate when the target was continuously visible and performance in darkness trials was significantly better than occlusion trials, providing evidence that there is something specific about occlusion that makes it more difficult than merely lack of visibility. Together, these findings suggest that infants’ and adults’ capacities to represent objects have similar signatures throughout development. (shrink)

John Hyman has used the objective character of occlusion shapes and of relative occlusion sizes to develop a more objective approach both in the analysis of linear perspective and in the theory of depiction. To this end Hyman develops two Occlusion Principles, plus an Aperture Colour Principle (which I do not discuss), which, together with our knowledge of appearances, are supposed to tell us what a picture depicts. I argue that Hyman underestimates the crucial role of the (...) psychological element in the work that the objective occlusion shape and relative occlusion sizes are assigned to do. Two pictures may have different contents in spite of the same occlusion shapes and the same (relative) occlusion sizes. It is the operation of constancy scaling in pictorial space which frustrates Hyman’s objectivism both in the domain of linear perspective and in the domain of depiction. (shrink)

In three experiments, subjects attempted to track multiple items as they moved independently and unpredictably about a display. Performance was not impaired when the items were briefly (but completely) occluded at various times during their motion, suggesting that occlusion is taken into account when computing enduring perceptual objecthood. Unimpaired performance required the presence of accretion and deletion cues along fixed contours at the occluding boundaries. Performance was impaired when items were present on the visual field at the same times (...) and to the same degrees as in the occlusion conditions, but disappeared and reappeared in ways which did not implicate the presence of occluding surfaces (e.g. by imploding and exploding into and out of existence, instead of accreting and deleting along a fixed contour). Unimpaired performance did not require visible occluders (i.e. Michotte’s tunnel effect) or globally consistent occluder positions. We discuss implications of these results for theories of objecthood in visual attention. (shrink)

Numerous philosophers accept the differentiation condition, according to which one does not see an object unless one visually differentiates it from its immediate surroundings. This paper, however, sounds a sceptical note. Based on suggestions by Dretske (2007) and Gibson (2002 [1972]), I articulate two ‘principles of occlusion’ and argue that each principle admits of a reading on which it is both plausible and incompatible with the differentiation condition. To resolve the inconsistency, I suggest we abandon the differentiation condition.

In this essay we argue that attempts to justify the value of the liberal arts in narrowly instrumental ways are a mistake, one that is likely to miss the central importance of a liberal arts education. Of course, we do not claim here that such instrumental justifications are completely wrong, but that in so far as liberal education is defended primarily in terms of enhanced practical outcomes (better paying jobs, saleable professional skills, higher scores on graduate and professional admissions exams, (...) and so on) advocates will fail to articulate one of the most important reasons for study in the liberal arts. We will characterizeliberal education as a practice of reflecting on, discussing, and evaluating the question of what sort of lives I we should lead. Based on this, we then offer whatwe believe is a more promising, more consistent way of justifying liberal education. (shrink)

This paper examines the evolution of Edmund Husserl’s theory of perceptual occlusion. This task is accomplished in two stages. First, I elucidate Husserl’s conclusion, from his 1901 Logical Investigations, that the occluded parts of perceptual objects are intended by partial signitive acts. I focus on two doctrines of that account. I examine Husserl’s insight that signitive intentions are composed of Gehalt and I discuss his conclusion that signitive intentions sit on the continuum of fullness. Second, the paper discloses how (...) Husserl transforms his 1901 philosophy in his 1913 revisions to the Sixth Logical Investigation, affirming that the occluded parts of perceptual objects are intended by empty contiguity acts. I demonstrate how he overturns the two core doctrines of his theory from the Investigations in these revisions, claiming that empty intentions are not composed of Gehalt and asserting that those acts break with the continuum of fullness. Husserl implements these changes to solve problems that arise from his recognition of two new kinds of intentions; darker and completely dark acts. Finally, in the conclusion, I cash out this analysis, by indicating that, in 1913, Husserl transforms his theory of fulfillment on the basis of his new insights about empty acts. (shrink)

In the philosophy of perception, objects are typically frontlit. But according to Roy Sorensen, backlit objects have surprising lessons to teach us about perception. In backlit conditions, ‘the principles of occlusion are reversed’, Sorensen (2008, p. 25) maintains. In particular, he claims we see the back surfaces of backlit objects. But as I argue in this paper, Sorensen’s arguments in support of those claims are flawed. After criticizing Sorensen’s arguments, I attempt to address a residual puzzle about backlit objects. (...) The upshot of the paper is that cases of backlighting do have important philosophical lessons to teach us after all – lessons concerning the notion of perceptual occlusion. (shrink)

ObjectiveRetinal vein occlusion (RVO) is the second most common retinal vascular disorder after diabetic retinopathy, which is the main cause of vision loss. Retinal vein occlusion might lead to macular edema, causing severe vision loss. Previous neuroimaging studies of patients with RVO demonstrated that RVO was accompanied by cerebral changes, and was related to stroke. The purpose of the study is to investigate synchronous neural activity changes in patients with RVO.MethodsA total of 50 patients with RVO and 48 (...) healthy subjects with matched sex, age, and education were enrolled in the study. The ReHo method was applied to investigate synchronous neural activity changes in patients with RVO.ResultsCompared with HC, patients with RVO showed increased ReHo values in the bilateral cerebellum_4_5. On the contrary, patients with RVO had decreased ReHo values in the bilateral middle occipital gyrus, right cerebelum_crus1, and right inferior temporal gyrus.ConclusionOur study demonstrated that patients with RVO were associated with abnormal synchronous neural activities in the cerebellum, middle occipital gyrus, and inferior temporal gyrus. These findings shed new insight into neural mechanisms of vision loss in patients with RVO. (shrink)

This paper aims to advance our understanding of Heidegger's politics as it is laid bare within the 'Schwarze Hefte'. Yet my interest is not in Heidegger's first order political views, but rather in his conception of the political sphere per se. Beginning from a close analysis of the earliest volume of the notebooks, Gesamtausgabe Bd.94, I suggest that the dominant characterisation of the political space within Heidegger's text is as a threat-to philosophy and to ontology. Underlying that characterisation, however, it (...) is simultaneously possible to identify another pattern, one on which the political is itself gradually suppressed or occluded by the ontological. This tacit occlusion has, I suggest, a number of deeply problematic consequences. I close by indicating how the argument might be extended to the question of a Heideggerian ethics. (shrink)

James Gibson's theory of information, as specific to (but not necessarily ) its sources, is especially indebted to the study of occlusion for its core examples. In occlusion, one is aware of hidden surfaces. Is this still too related to one modality to count as a good case for Stoffregen & Bardy?

Resumen: En este trabajo, se observa la variación fonética del fonema oclusivo bilabial sonoro en el español no estándar en una muestra de hablantes chilenos de ocho ciudades, cuyas ubicaciones geográficas permiten cubrir los principales sectores urbanos del país. En los resultados se evidencia un marcado uso del alófono aproximante labiodental sonoro en este tipo de habla y un comportamiento relativamente homogéneo en todo el país respecto de las principales variantes del fonema oclusivo bilabial sonoro. La comparación del fonema oclusivo (...) bilabial sonoro entre el español no estándar y el estándar muestra marcadas diferencias, datos que sugieren un cambio lingüístico en proceso desde el alófono aproximante bilabial sonoro al alófono aproximante labiodental sonoro.: In this study, we observed the phonetic variation of voiced bilabial occlusive phoneme in non-standard Spanish in a sample of Chilean speakers from cities whose geographical locations allow to cover the main urban sectors of the country. The results that show a marked use of voiced labiodental approximant allophone in this type of speech an a relatively homogenous behaviour in the whole country of the main variants of the voiced bilabial occlusive phoneme are presented. The comparison of voiced bilabial occlusive phoneme between non-standard and standard Spanish shows clear differences, data that suggest a linguistic change in process from voiced bilabial approximant allophone to voiced labiodental approximant allophone. (shrink)

While face masks prevent the spread of disease, they occlude lower face parts and thus impair facial emotion recognition. Since emotions are often also contextually situated, it remains unknown whether providing a descriptive emotional context alongside the facial emotion may reduce some of the negative impact of facial occlusion on emotional communication. To address this question, here we examined how emotional inferences were affected by facial occlusion and the availability of emotional context. Participants were presented with happy or (...) sad emotional faces who were either fully visible or partially obstructed by an opaque surgical mask. The faces were shown either within an emotionally congruent (e.g., “Her cat was found/lost yesterday afternoon”) or neutral (“Get ready to see the next person”) context. Participants were asked to infer the emotional states of the protagonists by rating their emotional intensity and valence. Facial occlusion by masks impacted the ratings, such that protagonists were judged to feel less intense and more neutral emotions when they wore masks relative to when their face was fully visible. Importantly, this negative impact of visual occlusion by mask was reduced but not fully eliminated when the faces were presented within a congruent emotional context. Thus, visual occlusion of facial emotions impairs understanding of emotions, with this negative effect of face masks partially mitigated by the availability of a larger emotional context. (shrink)

This is an appreciative five page book review of Elkholy's Heidegger and a Metaphysics of Feeling (2008). It raises a critical question about the difference between Heidegger's account of aletheia and Elkholy's concept of ontological occlusion.

This is a reply to Casey O'Callaghan and Jonathan Westphal’s comments on Seeing Dark Things: The Philosophy of Shadows. Both attempt to soften the blow to intuition that comes from the most controversial thesis of the book: we see the backs of back-lit objects. Each characterizes the viewing of silhouettes as a kind of marginal seeing that only discloses shapes, sizes and location. In response, photographs are presented to show that silhouettes are typically three-dimensional and they often have internal structure. (...) Consider the silhouette of a bird fluttering inside a cage; we see more than the outline of the cage. Orbiting this main point are subsidiary points about the distinction between shade and shadows, the nature of occlusion, the color black, and peculiarities of absent absences. (shrink)

Despite advances in feminism, the "law of the father" remains the dominant model of Western psychological and cultural analysis, and the law of the mother continues to exist as an underdeveloped and marginal concept. In her radical rereading of the Greek myth, _Oresteia_, Amber Jacobs hopes to rectify the occlusion of the mother and reinforce her role as an active agent in the laws that determine and reinforce our cultural organization. According to Greek myth, Metis, Athena's mother, was Zeus's (...) first wife. Zeus swallowed Metis to prevent her from bearing children who would overthrow him. Nevertheless, Metis bore Zeus a child-Athena-who sprang forth fully formed from his head. In Aeschylus's _Oresteia_, Athena's motherless status functions as a crucial justification for absolving Orestes of the crime of matricide. In his defense of Orestes, Zeus argues that the father is more important than the mother, using Athena's "motherless" birth as an example. Conducting a close reading of critical works on Aeschylus's text, Jacobs reveals that psychoanalytic theorists have unwittingly reproduced the denial of Metis in their own critiques. This repression, which can be found in the work of Sigmund Freud and Melanie Klein as well as in the work of more contemporary theorists such as André Green and Luce Irigaray, has resulted in both an incomplete analysis of Oresteia and an inability to account for the fantasies and unconscious processes that fall outside the oedipal/patricidal paradigm. By bringing the story of Athena's mother, Metis, to the forefront, Jacobs challenges the primacy of the Oedipus myth in Western culture and psychoanalysis and introduces a bold new theory of matricide and maternal law. She finds that the Metis myth exists in cryptic forms within Aeschylus's text, uncovering what she terms the "latent content of the Oresteian myth," and argues that the occlusion of the law of the mother is proof of the patriarchal structures underlying our contemporary social and psychic realities. Jacobs's work not only provides new insight into the Oresteian trilogy but also advances a postpatriarchal model of the symbolic order that has strong ramifications for psychoanalysis, feminism, and theories of representation, as well as for clinical practice and epistemology. (shrink)

Belonging together of the foreign -- Hermeneutic circularity: tradition as genuine repetition of futural past -- Inceptual thinking and nonsystematic atonality -- Heidegger's Seyn/Nichts and Kabbalistic Ein Sof -- Simsum, Lichtung, and bestowing refusal -- Autogenesis, nihilating leap, and otherness of the not-other -- Temporalizing and granting time-space -- Disclosive language: poiesis and apophatic occlusion of occlusion -- Ethnolinguistic enrootedness and invocation of historical destiny.

Recent debates over adults' theory of mind use have been fueled by surprising failures of perspective-taking in communication, suggesting that perspective-taking may be relatively effortful. Yet adults routinely engage in effortful processes when needed. How, then, should speakers and listeners allocate their resources to achieve successful communication? We begin with the observation that the shared goal of communication induces a natural division of labor: The resources one agent chooses to allocate toward perspective-taking should depend on their expectations about the other's (...) allocation. We formalize this idea in a resource-rational model augmenting recent probabilistic weighting accounts with a mechanism for (costly) control over the degree of perspective-taking. In a series of simulations, we first derive an intermediate degree of perspective weighting as an optimal trade-off between expected costs and benefits of perspective-taking. We then present two behavioral experiments testing novel predictions of our model. In Experiment 1, we manipulated the presence or absence of occlusions in a director–matcher task. We found that speakers spontaneously modulated the informativeness of their descriptions to account for “known unknowns” in their partner's private view, reflecting a higher degree of speaker perspective-taking than previously acknowledged. In Experiment 2, we then compared the scripted utterances used by confederates in prior work with those produced in interactions with unscripted directors. We found that confederates were systematically less informative than listeners would initially expect given the presence of occlusions, but listeners used violations to adaptively make fewer errors over time. Taken together, our work suggests that people are not simply “mindblind”; they use contextually appropriate expectations to navigate the division of labor with their partner. We discuss how a resource-rational framework may provide a more deeply explanatory foundation for understanding flexible perspective-taking under processing constraints. (shrink)

We show that early vision can use monocular cues to rapidly complete partially-occluded objects. Visual search for easily detected fragments becomes difficult when the completed shape is similar to others in the display; conversely, search for fragments that are difficult to detect becomes easy when the completed shape is distinctive. Results indicate that completion occurs via the occlusion-triggered removal of occlusion edges and linking of associated regions. We fail to find evidence for a visible filling-in of contours or (...) surfaces, but do find evidence for a "functional" filling-in that prevents the constituent fragments from being rapidly accessed. As such, it is only the completed structures—and not the fragments themselves—that serve as the basis for rapid recognition. (shrink)

While there is no denying the relevance of ethical knowledge and analytical and cognitive skills in ethics consultation, such knowledge and skills can be overemphasized. They can be effectively put into practice only by an ethics consultant, who has a broad range of other skills, including interpretive and communicative capacities as well as the capacity effectively to address the psychosocial needs of patients, family members, and healthcare professionals in the context of an ethics consultation case. In this paper, I discuss (...) how emotion can play an important interpretive role in clinical ethics consultation and why attention to the role of defense mechanisms can be helpful. I concentrate on defense mechanisms, arguing first, that the presence of these mechanisms is understandable given the emotional stresses and communicative occlusions that occur between the families of patients and critical care professionals in the circumstances of critical care; second, that identifying these mechanisms is essential for interpreting and managing how these factors influence the way that the “facts” of the case are understood by family members; and, third, that effectively addressing these mechanisms is an important component for effectively doing ethics consultation. Recognizing defense mechanisms, understanding how and why they operate, and knowing how to deal with these defense mechanisms when they pose problems for communication or decision making are thus essential prerequisites for effective ethics consultation, especially in critical care. (shrink)

The problem of amodal perception is the problem of how we represent features of perceived objects that are occluded or otherwise hidden from us. Bence Nanay (2010) has recently proposed that we amodally perceive an object's occluded features by imaginatively projecting them into the relevant regions of visual egocentric space. In this paper, I argue that amodal perception is not a single, unitary capacity. Drawing appropriate distinctions reveals amodal perception to be characterized not only by mental imagery, as Nanay suggests, (...) but also by genuinely visual representations as well as beliefs. I conclude with some brief remarks on the role of object-directed bodily action in conferring a sense of unseen presence on an object's occluded features. (shrink)

This article argues that by using theories of the spatial to understand how situated materiality (i.e., place) and contestations of identity matter when conceiving global and curricular space, educators may interrupt and rearticulate practices and systems of oppression. By focusing on globalization writ large, there is danger of leaving important concerns of the local unattended, and thereby failing to see how processes of globalization exacerbate problematic and oft-hidden curricular issues. Such diversions typify the most insidious quality of the current form (...) of globalization; that is: an articulation of ubiquitous, uniform, and systemically oppressive social scripts. Through the contestation of such scripts, this article focuses on the achievement of better spaces when gender and race are involved. We offer a discussion of curriculum where students write about and argue against the dominant representations of their lives in Washington, DC. Concluding meditations stress that a new conceptual frame is needed in everyday curriculum theorizing, one that enables a reconstruction of curriculum theorists' positionalities with regard to our support, or rerouting, of the scripts that enable globalized systems of oppression and occlusion. (shrink)

This paper attempts to answer a central question in unsupervised learning: what does it mean to “make sense” of a sensory sequence? In our formalization, making sense involves constructing a symbolic causal theory that both explains the sensory sequence and also satisfies a set of unity conditions. The unity conditions insist that the constituents of the causal theory – objects, properties, and laws – must be integrated into a coherent whole. On our account, making sense of sensory input is a (...) type of program synthesis, but it is unsupervised program synthesis. Our second contribution is a computer implementation, the Apperception Engine, that was designed to satisfy the above requirements. Our system is able to produce interpretable human-readable causal theories from very small amounts of data, because of the strong inductive bias provided by the unity conditions. A causal theory produced by our system is able to predict future sensor readings, as well as retrodict earlier readings, and impute (fill in the blanks of) missing sensory readings, in any combination. In fact, it is able to do all three tasks simultaneously. We tested the engine in a diverse variety of domains, including cellular automata, rhythms and simple nursery tunes, multi-modal binding problems, occlusion tasks, and sequence induction intelligence tests. In each domain, we test our engine's ability to predict future sensor values, retrodict earlier sensor values, and impute missing sensory data. The Apperception Engine performs well in all these domains, significantly out-performing neural net baselines. We note in particular that in the sequence induction intelligence tests, our system achieved human-level performance. This is notable because our system is not a bespoke system designed specifically to solve intelligence tests, but a general-purpose system that was designed to make sense of any sensory sequence. (shrink)

Matthew H. Bowker offers a novel analysis of "experience": the vast and influential concept that has shaped Western social theory and political practice for the past half-millennium. While it is difficult to find a branch of modern thought, science, industry, or art that has not relied in some way on the notion of "experience" in defining its assumptions or aims, no study has yet applied a politically-conscious and psychologically-sensitive critique to the construct of experience. Doing so reveals that most of (...) the qualities that have been attributed to experience over the centuries — particularly its unthinkability, its correspondence with suffering, and its occlusion of the self — are part of unlikely fantasies or ideologies. By analyzing a series of related cases, including the experiential education movement, the ascendency of trauma theory, the philosophy of the social contract, and the psychological study of social isolation, the book builds a convincing case that ideologies of experience are invoked not to keep us close to lived realities and ‘things-in-themselves,’ but, rather, to distort and destroy true knowledge of ourselves and others. In spite of enduring admiration for those who may be called champions of experience, such as Michel de Montaigne, Ralph Waldo Emerson, and others treated throughout the work, the ideologies of experience ultimately discourage individuals and groups from creating, resisting, and changing our experience, urging us instead to embrace trauma, failure, deprivation, and self-abandonment. (shrink)

The deformation and wear events that underlie microwear and macrowear signals commonly used for dietary reconstruction in fossil animals can be replicated and quantified by controlled laboratory tests on extracted tooth specimens in conjunction with fundamental micromechanics analysis. Key variables governing wear relations include angularity, stiffness (modulus), and size of the contacting particle, along with material properties of enamel. Both axial and sliding contacts can result in the removal of tooth enamel. The degree of removal, characterized by a “wear coefficient,” (...) varies strongly with particle content at the occlusal interface. Conditions leading to a transition from mild to severe wear are discussed. Measurements of wear traces can provide information about contact force and particle shape. The potential utility of the micromechanics methodology as an adjunct for investigating tooth durability and reconstructing diet is explored. (shrink)

Transplant surgeons in the USA have begun performing a novel organ procurement protocol in the setting of circulatory death. Unlike traditional donation after circulatory death (DCD) protocols,in situnormothermic perfusion DCD involves reperfusing organs, including the heart, while still contained in the donor body. Some commentators, including the American College of Physicians, have claimed thatin situreperfusion after circulatory death violates the widely accepted Dead Donor Rule (DDR) and conclude thatin situreperfusion is ethically impermissible. In this paper I argue that, in terms (...) of respecting the DDR,in situreperfusion cardiac transplantation does not differ from traditional DCD cardiac transplantation. I do this by introducing and defending a refined conception of circulatory death, namelyvegetative state function permanentism. I also argue against the controversial brain occlusion feature of thein situreperfusion DCD protocol, on the basis that it is ethically unnecessary and generates the problematic appearance of ethical dubiousness. (shrink)

I will investigate the auditory illusion of continuity, which is the phenomenon of auditory occlusion in which we are able to hear a sound as continuous even though it has been masked by another sound. This phenomenon seems to have a perceptual nature when it occurs in the context of everyday sounds, while it seems to have a cognitive nature when it occurs in the context of speech sounds. This difference has the following consequences: (1) We need to have (...) a differentiated approach to the study of this phenomenon; (2) the perceptual explanation of the phenomenon involving everyday sounds indicates that everyday sounds can be auditorily perceived; and (3) the cognitive explanation of the phenomenon involving speech sounds suggests, instead, that semantic properties cannot be auditorily perceived. From (2) and (3) it follows that while we have a good argument for the rich view when focusing on everyday sounds, we seem to lack an analogous argument to support the rich view in the context of speech sounds. Thus, I will suggest a new argument for the view that we do not hear semantic properties, as language understanding seems to be primarily a cognitive ability. (shrink)

Habermas does not rule out the possibility of violence in language. In fact his account explicitly licenses a broad conception of violence as ‘systematically distorted communication’. Yet he does rule out the possibility that language simultaneously imposes as it discloses. That is, his argument precludes the possibility of recognizing that there is an antinomy at the heart of language and philosophical reason. This occlusion of the simultaneously world-disclosing and world-imposing character of language feeds and sustains Habermas’s legal and political (...) arguments, where he states that in order to achieve consensus rational deliberation must eliminate force. In this paper, I claim that this argument operates through a manoeuvre that leaves Habermas’s position curiously blind to its own predicament. To explain why, I turn to Kant’s treatment of the problem of evil in Religion Within the Boundaries of Mere Reason. Here, as in the Western philosophical tradition more generally, evil has no separate existence: it is folded back into Kant’s philosophical scheme. Arendt notes that as soon as Kant identifies the problem of evil he rationalizes it into comprehensible motives. I will show how, through a move that is structurally similar to Kant’s rationalization of evil, Habermas rationalizes and attempts to eliminate violence from his consideration of law and language. In Habermas’s work, law and language appear as ciphers for reason. The case to be made here is that Habermas’s inability to recognize the paradoxical character of language and reason makes his work blind to the violence in which it is unavoidably implicated. (shrink)

Luminance and color are strong and self-sufficient cues to pictorial depth in visual scenes and images. The present study investigates the conditions Under which luminance or color either strengthens or overrides geometric depth cues. We investigated how luminance contrasts associated with color contrast interact with relative height in the visual field, partial occlusion, and interposition in determining the probability that a given figure is perceived as ‘‘nearer’’ than another. Latencies of ‘‘near’’ responses were analyzed to test for effects of (...) attentional selection. Figures in a pair were supported by luminance contrast or isoluminant color contrast and combined with one of the three geometric cues. The results of Experiment 1 show that luminance contrasts associated with hue, when it does not interact with other hues, produces the same effects as achromatic luminance contrasts: The probability of‘‘near’’ increases with luminance contrast while the latencies for ‘‘near’’ responses decrease. Partial occlusion is found to be a strong enough pictorial cue to support a weaker red luminance contrast. Interposition cues lose out against cues of spatial position and partial occlusion. The results of Experiment 2, with isoluminant displays of varying color contrast, reveal that red color contrast on a light background supported by any of the three geometric cues wins over green or white supported by any of the three geometric cues. On a dark background, red color contrast supported by the interposition cue loses out against green or white color contrast supported by partial occlusion. These findings reveal that color is not an independent depth cue, but is strongly influenced by luminance contrast and stimulus geometry. Systematically shorter response latencies for stronger ‘‘near’’ percepts demonstrate that selective visual attention reliably detects the most likely depth cue combination in a given configuration. (shrink)

Bioethicists who seek to defend commercial transactions that intuitively seem exploitative, such as organ sales and commercial surrogacy, typically pair a liberal analysis of exploitation with a libertarian analysis of autonomy. In this paper, I argue that the liberal analysis of exploitation, which focuses primarily on two party transactions between individuals, occludes the structural dimensions of exploitation. This occlusion then paves the way for the transaction to be understood in terms of libertarian autonomy. I propose that a vulnerability analysis (...) paired with a multidimensional and relational theory of autonomy highlights the structural dimensions of exploitation and exposes the myth-making that underlies claims that these forms of exploitation are autonomy-enhancing. (shrink)

This paper examines the evolution of Husserl’s philosophy of nonintuitive intentions. The analysis has two stages. First, I expose a mistake in Husserl’s account of non-intuitive acts from his 1901 Logical Investigations. I demonstrate that Husserl employs the term “signitive” too broadly, as he concludes that all non-intuitive acts are signitive. He states that not only meaning acts, but also the contiguity intentions of perception are signitive acts. Second, I show how Husserl, in his 1913/14 Revisions to the Sixth Logical (...) Investigation, amends his 1901 theory of non-intuitive acts, which he now calls “empty” intentions. He there accurately distinguishes empty meaning acts from the empty intentions of perception. In the conclusion, I reveal how Husserl’s alterations to his theory of non-intuitive intentions can inform our understanding of a larger shift in his philosophy. (shrink)

This paper takes five different perspectives on kinesthesia, beginning with its evolution across animate life and its biological distinction from, and relationship to proprioception. It proceeds to document the historical derivation of “the muscle sense,” showing in the process how analytic philosophers bypass the import of kinesthesia by way of “enaction,” for example, and by redefinitions of “tactical deception.” The article then gives prominence to a further occlusion of kinesthesia and its subduction by proprioception, these practices being those of (...) well-known phenomenologists, practices that exemplify an adultist perspective supported in large part by the writings of Merleau-Ponty. Following this extended critical review, the article shows how Husserl’s phenomenology enlightens us about kinesthesia and in doing so offers us substantive clues to the phenomenology of learning as it takes place in the development and acquisition of skillful movement. It shows further how phenomenological methodology contrasts markedly with existential analysis, most significantly in its recognition of, and its ability to set forth a developmental history, a veritable genetic phenomenology that is basically a phenomenology of learning anchored in kinesthesia. After showing how that phenomenology of learning finds mutual validation in a classic empirical study of infant movement, the article ends by highlighting how human “I cans” are grounded in “I move,” specifically, in the pan-human ability to learn one’s body and learn to move oneself. (shrink)

The experiments reported herein probe the visual cortical mechanisms that control near–far percepts in response to two-dimensional stimuli. Figural contrast is found to be a principal factor for the emergence of percepts of near versus far in pictorial stimuli, especially when stimulus duration is brief. Pictorial factors such as interposition (Experiment 1) and partial occlusion Experiments 2 and 3) may cooperate, as generally predicted by cue combination models, or compete with contrast factors in the manner predicted by the FACADE (...) model. In particular, if the geometrical conŽ guration of an image favors activation of cortical bipole grouping cells, as at the top of a T-junction, then this advantage can cooperate with the contrast of the conŽ guration to facilitate a near–far percept at a lower contrast than at an X-junction. Varying the exposure duration of the stimuli shows that the more balanced bipole competition in the X-junction case takes longer exposure times to resolve than the bipole competition in the T-junction case (Experiment 3). (shrink)

A 55-year-old man, admitted to the hospital after an episode of aphasia due to transient ischemic attack, underwent ultrasound imaging that showed near occlusion of the left carotid artery. A carot...