The politics of suffering: Progress, modernity and the adolescent crisis

A concern for progress is central to the public agendas of modern societies. Political actors compete with one another mainly with regard to their respective claims to bring about a better future, particularly in the economic and technological spheres. The focus on progress has, however, deeper roots which date back to the aspirations of the Enlightenment. Around that time, the belief arose that systematic improvements are made possible by the structural features of modern society and culture, improvements that will gradually release humanity from much of the suffering characterising its historical past. This article argues the persistence of a culture of progress, rather than easing suffering, in fact enhances and mobilises it for the pursuit of superficial forms of gain. It is also claimed the attempt by Habermas' critical theory to develop a broader and more satisfactory conception of progress fails to address this problem. The article suggests an alternative and more fundamental critique of progressive ideas is required. It reflects upon these abstract theoretical questions in connection with the concrete example of the 'adolescent crisis' and the role ideas of progress play within it.

Color constancy and the functional significance of McCollough effects

A central problem in visual perception concerns how humans perceive stable and uniform object colors despite variable lighting conditions (i.e. color constancy). One solution is to 'discount' variations in lighting across object surfaces by encoding color contrasts, and utilize this information to 'fill in' properties of the entire object surface. Implicit in this solution is the caveat that the color contrasts defining object boundaries must be distinguished from the spurious color fringes that occur naturally along luminance-defined edges in the retinal image (i.e. optical chromatic aberration). In the present paper, we propose that the neural machinery underlying color constancy is complemented by an 'error-correction' procedure which compensates for chromatic aberration, and suggest that error-correction may be linked functionally to the experimentally induced illusory colored aftereffects known as McCollough effects (MEs). To test these proposals, we develop a neural network model which incorporates many of the receptive-field (RF) profiles of neurons in primate color vision. The model is composed of two parallel processing streams which encode complementary sets of stimulus features: one stream encodes color contrasts to facilitate filling-in and color constancy; the other stream selectively encodes (spurious) color fringes at luminance boundaries, and learns to inhibit the filling-in of these colors within the first stream. Computer simulations of the model illustrate how complementary color-spatial interactions between error-correction and filling-in operations (a) facilitate color constancy, (b) reveal functional links between color constancy and the ME, and (c) reconcile previously reported anomalies in the local (edge) and global (spreading) properties of the ME. We discuss the broader implications of these findings by considering the complementary functional roles performed by RFs mediating color-spatial interactions in the primate visual system. (C) 2002 Elsevier Science Ltd. All rights reserved.