The interplay of holistic shape, local feature and color informationin object categorization

Rokszin, AA and Győri-Dani, D and Linnert, S and Krajcsi, Attila and Tompa, Tamás and Csifcsák, Gábor (2015) The interplay of holistic shape, local feature and color informationin object categorization. Biological Psychology. ISSN 0301-0511

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Abstract

tAlthough it is widely accepted that colors facilitate object and scene recognition under various circum-stances, several studies found no effects of color removal in tasks requiring categorization of brieflypresented animals in natural scenes. In this study, three experiments were performed to test the assump-tion that the discrepancy between empirical data is related to variations of the available meaningful globalinformation such as object shapes and contextual cues. Sixty-one individuals categorized chromatic andachromatic versions of intact and scrambled images containing either cars or birds. While color removaldid not affect the classification of intact stimuli, the recognition of moderately scrambled achromaticimages was more difficult. This effect was accompanied by amplitude modulations of occipital event-related potentials emerging from approximately 150 ms post-stimulus. Our results indicate that colorsfacilitate stimulus classification, but this effect becomes prominent only in cases when holistic processingis not sufficient for stimulus recognition.

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