Online research in philosophy

Neuroscience offers more than new empirical evidence about the details of cognitive functions such as language, perception and action. Since it also shows many functions to be highly distributed, interconnected and dependent on mechanisms at different levels of processing, it challenges concepts that are traditionally used to describe these functions. The question is how to accommodate these concepts to the recent evidence. A recent proposal, made in Philosophical Foundations of Neuroscience (2003) by Bennett and Hacker, is that concepts play a foundational role in neuroscience, that empirical research needs to presuppose them and that changing concepts is a philosophical task. In defending this perspective, PFN shows much neuroscientific writing to be dualistic in nature due to our poor grasp of its foundations. In our review article we take a different approach. Instead of foundationalism we plead for a mild coherentism, which allows for a gradual and continuous alteration of concepts in light of new evidence. Following this approach it is also easier to deal with some neurological conditions (like blindsight, synaesthesia) that pose difficulties for our concepts. Finally, although words and concepts seem to seduce us to thinking that many skills and tasks function separately, it is language skill that – as neuroscientific evidence shows – co-emerges with action/perception cycles and thus seems to require revision of some of our central concepts.

I disagree with Ross about the location of colors: They are in the brain, not in the external world. It is difficult to deny that there are colors in our conscious visual experience, and if we take the causal theory of perception seriously, we cannot identify these colors with the beginning of the causal chain in perception (external objects in the distal stimulus field), but we must search for them at the end of the causal chain (in the brain). Several lines of compelling evidence from cognitive neuroscience (e.g., synesthesia, dreaming, and achromatopsia) demonstrate unambiguously that color is in the brain. Furthermore, it seems that Ross has failed to consider one substantial version of subjectivism in his article. This monistic approach to color and consciousness appears to be the least implausible alternative when we try to understand what colors are and where they reside.

In this paper I argue for the cognitive impenetrability of perception by undermining the argument from reentrant pathways. To do that I will adduce psychological and neuropsychological evidence showing that (a) early vision processing is not affected by our knowledge about specific objects and events, and (b) that the role of the descending pathways is to enable the early-vision processing modules to participate in higher-level visual or cognitive functions. My thesis is that a part of observation, which I will call perception, is bottom-up and theory neutral. As such, perception could play the role of common ground on which a naturalized epistemology can be built and relativism avoided.

A movement dedicated to applying neuroscience to traditional philosophical problems and using philosophical methods to illuminate issues in neuroscience began about twenty-five years ago. Results in neuroscience have affected how we see traditional areas of philosophical concern such as perception, belief-formation, and consciousness. There is an interesting interaction between some of the distinctive features of neuroscience and important general issues in the philosophy of science. And recent neuroscience has thrown up a few conceptual issues that philosophers are perhaps best trained to deal with. After sketching the history of the movement, we explore the relationships between neuroscience and philosophy and introduce some of the specific issues that have arisen.

Pylyshyn's model of visual perception leads to problems in understanding the nature of perceptual experience. The cause of the problems is an underlying lack of clarity about the relation between the operation of the subpersonal vision module and visual perception at the level of the subject or person.

This paper proposes an empirical hypothesis that in some cases of social interaction we have an immediate perceptual access to others' minds in the perception of their embodied intentionality. Our point of departure is the phenomenological insight that there is an experiential difference in the perception of embodied intentionality and the perception of non-intentionality. The other's embodied intentionality is perceptually given in a way that is different from the givenness of non-intentionality. We claim that the phenomenological difference in the perception of embodied intentionality and non-intentionality translates into an account of how, in some cases of social cognition, we perceive mental properties in the perception of embodied intentionality. The hypothesis derives support from a host of recent empirical studies in social neuroscience which demonstrate the importance of embodied engagements in understanding other minds. These studies reveal that embodied intersubjective interaction often builds on our ability to understand other minds in an immediate perceptual way not adequately investigated by theory-theory (TT) and simulation theories (ST) of mind-reading. We argue that there is a genuine, nontrivial difference in the informational content of the perception of embodied intentionality and the perception of non-intentionality which leads to a further difference in the way information is processed in the case of perception of embodied intentionality as opposed to the perception of non-intentionality. The full significance of such difference is appreciated only within an account of perception which views perception and action as tightly coupled. Thus, we propose an "action-oriented account of social perception" to develop a neurophilosophical account of the perceptual knowledge of other minds.

I offer an explanation of how subjects are able to perceive the intrinsic spatial properties of objects, given that subjects always perceive from a particular location. The argument proceeds in two steps. First, I argue that a conception of space is necessary to perceive the intrinsic spatial properties of objects. This conception of space is spelled out by showing that perceiving intrinsic properties requires perceiving objects as the kind of things that are perceivable from other locations. Second, I show that having such a conception of space presupposes that a subject represent her location in relation to perceived objects. More precisely the thesis is that a subject represents her location as the location from which she both perceives objects and would act in relation to objects were she to act. So I argue that perception depends on the capacity to know what it would be to act in relation to objects.

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.

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.