Spatial Heterogeneity in the Perception of Face and Form Attributes
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Afraz-2010-Spatial Heterogeneit.pdf
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Author(s)
Afraz, Arash
Pashkam, Maryam Vaziri
Cavanagh, Patrick
Date Issued
November 2010
Journal
Current Biology
Publisher
Elsevier
Citation
Afraz, Arash, Maryam Vaziri Pashkam, and Patrick Cavanagh. “Spatial Heterogeneity in the Perception of Face and Form Attributes.” Current Biology 20, no. 23 (December 2010): 2112–2116. © 2010 Elsevier Ltd.
Version
Final published version
Abstract
The identity of an object is a fixed property, independent of where it appears, and an effective visual system should capture this invariance [1, 2 and 3]. However, we now report that the perceived gender of a face is strongly biased toward male or female at different locations in the visual field. The spatial pattern of these biases was distinctive and stable for each individual. Identical neutral faces looked different when they were presented simultaneously at locations maximally biased to opposite genders. A similar effect was observed for perceived age of faces. We measured the magnitude of this perceptual heterogeneity for four other visual judgments: perceived aspect ratio, orientation discrimination, spatial-frequency discrimination, and color discrimination. The effect was sizeable for the aspect ratio task but substantially smaller for the other three tasks. We also evaluated perceptual heterogeneity for facial gender and orientation tasks at different spatial scales. Strong heterogeneity was observed even for the orientation task when tested at small scales. We suggest that perceptual heterogeneity is a general property of visual perception and results from undersampling of the visual signal at spatial scales that are small relative to the size of the receptive fields associated with each visual attribute.
MIT Department
McGovern Institute for Brain Research at MIT
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1016/j.cub.2010.11.017
