Nigel Thomas

Classical and medieval writers had no term for consciousness in anything like the modern sense, and their philosophy seems not to have been troubled by the mind-body problem. Contemporary eliminativists find strong support in this fact for their claim that consciousness does not exist, or, at least, is not an appropriate scientific explanandum. They typically hold that contemporary conceptions of consciousness are artefacts of Descartes' (now outmoded) views about matter and his unrealistic craving for epistemological certainty. Essentially, they say, our belief in consciousness is a residue of once pressing, but now irrelevant, intellectual tensions between religion and the rising new science of the Early Modern period. With the attempts of Descartes and his successors to resolve these tensions, Western thought began down a track toward the conceptual cul-de-sac of the "hard problem". Plausibly, the problem will only be (dis)solved, and the onward march of science assured, when we are able to shake off the pervasive influence of the Cartesian tradition in a way that goes far beyond the mere rejection of dualism. But when we do so, eliminativists contend, the distinctively Cartesian notion of consciousness will simply drop out of our world-picture, like phlogiston or the vital entelechy

A theory of the structure and cognitive function of the human imagination that attempts to do justice to traditional intuitions about its psychological centrality is developed, largely through a detailed critique of the theory propounded by Colin McGinn. Like McGinn, I eschew the highly deflationary views of imagination, common amongst analytical philosophers, that treat it either as a conceptually incoherent notion, or as psychologically trivial. However, McGinn fails to develop his alternative account satisfactorily because (following Reid, Wittgenstein and Sartre) he draws an excessively sharp, qualitative distinction between imagination and perception, and because of his flawed, empirically ungrounded conception of hallucination. His arguments in defense of these views are rebutted in detail, and the traditional, passive, Cartesian view of visual perception, upon which several of them implicitly rely, is criticized in the light of findings from recent cognitive science and neuroscience. It is also argued that the apparent intuitiveness of the passive view of visual perception is a result of mere historical contingency. An understanding of perception (informed by modern visual science) as an inherently active process enables us to unify our accounts of perception, mental imagery, dreaming, hallucination, creativity, and other aspects of imagination within a single coherent theoretical framework.

Mental imagery (varieties of which are sometimes colloquially refered to as “visualizing,” “seeing in the mind's eye,” “hearing in the head,” “imagining the feel of,” etc.) is quasi-perceptual experience; it resembles perceptual experience, but occurs in the absence of the appropriate external stimuli. It is also generally understood to bear intentionality (i.e., mental images are always images of something or other), and thereby to function as a form of mental representation. Traditionally, visual mental imagery, the most discussed variety, was thought to be caused by the presence of picturelike representations (mental images) in the mind, soul, or brain, but this is no longer universally accepted

Galton and subsequent investigators find wide divergences in people's subjective reports of mental imagery. Such individual differences might be taken to explain the peculiarly irreconcilable disputes over the nature and cognitive significance of imagery which have periodically broken out among psychologists and philosophers. However, to so explain these disputes is itself to take a substantive and questionable position on the cognitive role of imagery. This article distinguishes three separable issues over which people can be "for" or "against" mental images. Conflation of these issues can lead to theoretical differences being mistaken for experiential differences, even by theorists themselves. This is applied to the case of John B. Watson, who inaugurated a half-century of neglect of image psychology. Watson originally claimed to have vivid imagery; by 1913 he was denying the existence of images. This strange reversal, which made his behaviorism possible, is explicable as a "creative misconstrual" of Dunlap's "motor" theory of imagination.