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Electrophysiological markers of categorical perception of colour in 7-month-old infants

Clifford, AM, Franklin, A, Davies, IRL and Holmes, A (2009) Electrophysiological markers of categorical perception of colour in 7-month-old infants Brain and Cognition, 71 (2). 165 - 172. ISSN 0278-2626

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Abstract

Categorical perception (CP) of color is the faster and/or more accurate discrimination of colors from different categories than equivalently spaced colors from the same category. Here, we investigate whether color CP at early stages of chromatic processing is independent of top-down modulation from attention. A visual oddball task was employed where frequent and infrequent colored stimuli were either same- or different-category, with chromatic differences equated across conditions. Stimuli were presented peripheral to a central distractor-task to elicit an event-related potential (ERP) known as the visual mismatch negativity (vMMN). The vMMN is an index of automatic and pre-attentive visual change detection arising from generating loci in visual cortices. The results revealed a greater vMMN for different-category than same-category change detection when stimuli appeared in the lower visual field, and an absence of attention-related ERP components. The findings provide the first clear evidence for an automatic and pre-attentive categorical code for color.

Item Type: Article
Additional Information: This is an electronic version of a paper published as Clifford A, Franklin A, Davies IRL, Holmes A (2009). Electrophysiological markers of categorical perception of color in 7-month old infants. BRAIN COGNITION 71(2):165-172. Availbale online at: http://www.sciencedirect.com/science/journal/02782626/71/2
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Divisions: Faculty of Arts and Human Sciences > Psychology
Depositing User: Symplectic Elements
Date Deposited: 08 May 2012 15:44
Last Modified: 23 Sep 2013 19:14
URI: http://epubs.surrey.ac.uk/id/eprint/231718

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