Online research in philosophy

The standard adaptationist explanation of the presence of a sensory mechanism in an organism--that it detects properties useful to the organism--cannot be given for color vision. This is because colors do not exist. After arguing for this latter claim, I consider, but reject, nonadaptationist explanations. I conclude by proposing an explanation of how color vision could have adaptive value even though it does not detect properties in the environment.

It has been said that variation in normal color vision creates a problem for a certain theories of color. But there has been some controversy concerning the nature of the problem; indeed, it has been questioned whether there is even a problem at all. Here I do not use variation in normal color vision to develop a problem for any theory of color. Instead I use variation in normal color vision, together with certain natural assumptions, to develop a problem for reductive theories of our consciousness of colors. Elsewhere I have argued that hypothetical cases of biological variation in color vision create a problem for reductive theories of our consciousness of color. In the present paper, I argue that actual cases of standard variation create a quite different problem for such theories.

This book is a major contribution to the interdisciplinary project of investigating the true nature of color vision.

It is argued that color constancy is only one of the benefits of color vision and probably not the most important one. Attention to a different benefit, chromatic contrast, suggests that the features of the environment that played a role in the evolution of color vision are properties of particular ecological niches rather than properties of naturally-occurring illumination. [Shepard].

Our question is: how do things look to the color-blind? But what does that mean? Who are the “color-blind”? Approximately 7% of males and fewer than 1% of females (of European descent1) have some form of inherited defect of color vision, and as a result are unable to discriminate some colored stimuli that most of us can tell apart. (‘Color defective’ is an alternative term that is often used; we will continue to speak with the vulgar.) Color vision defects constitute a spectrum of disorders with varying degrees and types of departure from normal human color vision. One form of color vision defect is dichromacy: by mixing together only two lights, the dichromat can match any light, unlike normal trichromatic humans who need to mix three. The most common form of dichromacy (afflicting about 2% of males) is red-green color blindness, or red-green dichromacy, which itself comes in two varieties. A red-green dichromat will not be able to distinguish some pairs of stimuli that respectively appear red and green to those with normal color vision. For simplicity we will concentrate almost exclusively on red-green color blindness.2 In a philosophical context our question is liable to be taken two ways. First, it can be straightforwardly taken as a question about visible properties of external objects like..

The paper discusses al-Kindi's response to doctrines held by contemporary theologians of the Mu‘tazilite school: divine attributes, creation, and freedom. In the first section it is argued that, despite his broadly negative theology, al-Kindi recognizes a special kind of “essential” positive attribute belonging to God. The second section argues that al-Kindi agreed with the Mu‘tazila in holding that something may not yet exist but still be an object of God's knowledge and power (as the Mu‘tazila put it, that “non-being” is a “thing”). Also it presents a new parallel between al-Kindi and John Philoponus. The third section gives an interpretation of al-Kindi as a compatibilist, in other words as holding that humans may be free even though their actions are necessitated. In all three cases, it is argued, al-Kindi is close to the Mu‘tazilite point of view, though he departs from them in the arguments he gives for that point of view.

1. Introduction Our question is: how do things look to the color-blind? But what does that mean? Who are the “color-blind”? Approximately 7% of males and fewer than 1% of females (of European descent1) have some form of inherited defect of color vision, and as a result are unable to discriminate some colored stimuli that most of us can tell apart. (‘Color defective’ is an alternative term that is often used; we will continue to speak with the vulgar.) Color vision defects constitute a spectrum of disorders with varying degrees and types of departure from normal human color vision. One form of color vision defect is dichromacy: by mixing together only two lights, the dichromat can match any light, unlike normal trichromatic humans who need to mix three. The most common form of dichromacy (afflicting about 2% of males) is red-green color blindness, or red-green dichromacy, which itself comes in two varieties. A red-green dichromat will not be able to distinguish some pairs of stimuli that respectively appear red and green to those with..

This book is a major contribution to the interdisciplinary project of investigating the true nature of color vision. In recent times, research into color vision has been one of the main success stories of cognitive science. Each discipline in the field--neuroscience, psychology, linguistics, computer science and philosophy--has contributed significantly to our understanding of color. Evan Thompson provides an accessible review of current scientific and philosophical discussions of color vision. He steers a course between the subjective and objective positions on color, arguing for a relational account. Thompson develops a novel "ecological" approach to color vision in cognitive science and the philosophy of perception. The book is vital reading for all cognitive scientists and philosophers whose interests touch upon this central area.

What is color? What is color vision? Most philosophers answer by reference to humans: to human color qualia, or to the environmental properties or "quality spaces" perceived by humans. It is argued, with reference to empirical findings concerning comparative color vision and the evolution of color vision, that all such attempts are mistaken. An adequate definition of color vision must eschew reference to its outputs in the human cognition and refer only to inputs: color vision consists in the use of wavelength discrimination in the construction of visual representations. A color quality is one that is generated from such processing.