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Title: Does automatic human face categorization depend on head orientation?
Authors: Or, Charles C.-F. 
Retter, Talia L.
Rossion, Bruno
Keywords: Social sciences::Psychology
Issue Date: 2021
Source: Or, C. C., Retter, T. L. & Rossion, B. (2021). Does automatic human face categorization depend on head orientation?. Cortex, 141, 94-111.
Project: 2019- T1-001-060
2018-T1-001- 069
Journal: Cortex
Abstract: Whether human categorization of visual stimuli as faces is optimal for full-front views, best revealing diagnostic features but lacking depth cues, remains largely unknown. To address this question, we presented 16 human observers with unsegmented natural images of different living and non-living objects at a fast rate (f = 12 Hz), with natural face images appearing at f/9 = 1.33 Hz. Faces posing all full-front or at ¾ side view angles appeared in separate sequences. Robust frequency-tagged 1.33 Hz (and harmonic) occipito-temporal electroencephalographic (EEG) responses reflecting face-selective neural activity did not differ in overall amplitude between full-front and ¾ side views. Despite this, alternating between full-front and ¾ side views within a sequence led to significant responses at specific harmonics of .67 Hz (f/18), objectively isolating view-dependent face-selective responses over occipito-temporal regions. Critically, a time-domain analysis showed that these view-dependent face-selective responses reflected only an earlier response to full-front than ¾ side views by 8-13 ms. Overall, these findings indicate that the face-selective neural representation is as robust for ¾ side faces as for full-front faces in the human brain, but full-front views provide a slightly earlier processing-time advantage as compared to rotated face views.
ISSN: 0010-9452
DOI: 10.1016/j.cortex.2021.03.030
Schools: School of Social Sciences 
Rights: © 2021 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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