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- W4295466724 endingPage "21.2022" @default.
- W4295466724 startingPage "ENEURO.0420" @default.
- W4295466724 abstract "Abstract The ability to detect faces in the environment is of utmost ecological importance for human social adaptation. While face categorization is efficient, fast and robust to sensory degradation, it is massively impaired when the facial stimulus does not match the natural contrast statistics of this visual category, i.e., the typically experienced ordered alternation of relatively darker and lighter regions of the face. To clarify this phenomenon, we characterized the contribution of natural contrast statistics to face categorization. Specifically, 31 human adults viewed various natural images of nonface categories at a rate of 12 Hz, with highly variable images of faces occurring every eight stimuli (1.5 Hz). As in previous studies, neural responses at 1.5 Hz as measured with high-density electroencephalography (EEG) provided an objective neural index of face categorization. Here, when face images were shown in their naturally experienced contrast statistics, the 1.5-Hz face categorization response emerged over occipito-temporal electrodes at very low contrast [5.1%, or 0.009 root-mean-square (RMS) contrast], quickly reaching optimal amplitude at 22.6% of contrast (i.e., RMS contrast of 0.041). Despite contrast negation preserving an image’s spectral and geometrical properties, negative contrast images required twice as much contrast to trigger a face categorization response, and three times as much to reach optimum. These observations characterize how the internally stored natural contrast statistics of the face category facilitate visual processing for the sake of fast and efficient face categorization." @default.
- W4295466724 created "2022-09-14" @default.
- W4295466724 creator A5001760750 @default.
- W4295466724 creator A5017427903 @default.
- W4295466724 creator A5031183692 @default.
- W4295466724 creator A5044063566 @default.
- W4295466724 date "2022-09-01" @default.
- W4295466724 modified "2023-10-17" @default.
- W4295466724 title "Natural Contrast Statistics Facilitate Human Face Categorization" @default.
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