The segregation and integration of colour in motion processing revealed by motion after-effects

Proceedings. Biological Sciences
D J McKeefryP V McGraw

Abstract

Analysis of the colour and motion of objects is widely believed to take place within segregated processing pathways in the primate visual system. However, it is apparent that this segregation cannot remain absolute and that there must be some capacity for integration across these sub-modalities. In this study, we have assessed the extent to which colour constitutes a separable entity in human motion processing by measuring the chromatic selectivity of two kinds of after-effect resulting from motion adaptation. First, the traditional motion after-effect, where prolonged inspection of a unidirectional moving stimulus results in illusory motion in the opposite direction, was found to exhibit a high degree of chromatic selectivity. The second type of after-effect, in which motion adaptation induces misperceptions in the spatial position of stationary objects, was completely insensitive to chromatic composition. This dissociation between the chromatic selectivities of these after-effects shows that chromatic inputs remain segregated at early stages of motion analysis, while at higher levels of cortical processing there is integration across chromatic, as well as achromatic inputs, to produce a unified perceptual output.

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Citations

Apr 27, 2012·Proceedings. Biological Sciences·Marco Turi, David Burr
Oct 9, 2009·Journal of Neurophysiology·Neil W Roach, Paul V McGraw
Jul 27, 2011·International Journal of Nephrology·Manoocher Soleimani, Pooneh Alborzi
Jun 10, 2015·Proceedings of the National Academy of Sciences of the United States of America·Marco TuriElizabeth Pellicano
Feb 18, 2011·Vision Research·David Burr, Peter Thompson
Feb 13, 2007·Current Biology : CB·Shin'ya NishidaToyotaro Tokimoto
Feb 3, 2009·Current Biology : CB·Kiley SeymourAndreas Bartels
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Oct 21, 2016·Scientific Reports·Satoshi ShioiriIchiro Kuriki
Dec 3, 2016·Journal of Neurophysiology·Kyriaki MikellidouDavid C Burr

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