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The contribution of color information to rapid face categorization in natural scenes.
Or, Charles C-F; RETTER, Talia; Rossion, Bruno
2019In Journal of Vision, 19 (5), p. 20
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Abstract :
[en] Color's contribution to rapid categorization of natural images is debated. We examine its effect on high-level face categorization responses using fast periodic visual stimulation (Rossion et al., 2015). A high-density electroencephalogram (EEG) was recorded during presentation of sequences of natural object images every 83 ms (i.e., at F = 12.0 Hz). Natural face images were embedded in the sequence at a fixed interval of F/9 (1.33 Hz). There were four conditions: (a) full-color images; (b) grayscale images; and (c) and (d) phase-scrambled images from Conditions 1 and 2, respectively, making faces and objects unrecognizable. Observers' task was to respond to color changes of the fixation cross (Experiment 1). We found face-categorization responses at 1.33 Hz and its harmonics (2.67 Hz, etc.) over occipitotemporal areas, with right-hemisphere dominance; responses to color images were not significantly different from those to grayscale images. Behavioral analysis revealed longer response times when images contained color, despite nearly-all-correct performance in all conditions, suggesting that color change in the task might detract from color's contribution to face categorization. We subsequently changed the task to responding to fixation shape changes so that such response-time differences were eliminated (Experiment 2). The aggregate face-categorization response became 21.6% stronger to color than to grayscale images. This color advantage occurred late, at 290-415 ms after stimulus onset. Our results suggest that the color advantage for face categorization interacts with behavior, and that color only has a moderate and relatively late contribution to rapid face categorization in natural images.
Disciplines :
Neurosciences & behavior
Author, co-author :
Or, Charles C-F;  Division of Psychology, School of Social Sciences, Nanyang Technological University, Singapore ; Psychological Sciences Research Institute & Institute of Neuroscience, University of Louvain, Belgium
RETTER, Talia  ;  Psychological Sciences Research Institute & Institute of Neuroscience, University of Louvain, Belgium ; Department of Psychology, Center for Integrative Neuroscience, University of Nevada, Reno, USA
Rossion, Bruno;  Psychological Sciences Research Institute & Institute of Neuroscience, University of Louvain, Belgium ; Université de Lorraine, CNRS, CRAN, F-54000, Nancy, France ; CHRU-Nancy, Service de Neurologie, F-54000, Nancy, France
External co-authors :
yes
Language :
English
Title :
The contribution of color information to rapid face categorization in natural scenes.
Publication date :
01 May 2019
Journal title :
Journal of Vision
eISSN :
1534-7362
Publisher :
Association for Research in Vision and Ophthalmology Inc., United States
Volume :
19
Issue :
5
Pages :
20
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
This work was supported by Nanyang Technological University Start-Up Grant and National Fund for Scientific Research (F.R.S.-FNRS, Belgium) postdoctoral fellowship to CO (FC 2773), Academic Research Fund (AcRF, Singapore) Tier 1 Grant 2018-T1-001-069 to CO and BR, F.R.S.-FNRS doctoral grant to TLR (FC 7159), and European Research Council (ERC) grant to BR (facessvep 284025).
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