Lateralization of face processing in the human brain
Name
Sinha-2012-Lateralization.pdf
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846.49 KB
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Author(s)
Meng, Ming
Cherian, Tharian
Singal, Gaurav
Sinha, Pawan
Date Issued
January 2012
Journal
Proceedings of the Royal Society of Edinburgh Section B Biological Sciences
Publisher
Cambridge University Press
Citation
Meng, M. et al. “Lateralization of Face Processing in the Human Brain.” Proceedings of the Royal Society B: Biological Sciences 279.1735 (2012): 2052–2061. Web.
Version
Author's final manuscript
Abstract
Are visual face processing mechanisms the same in the left and right cerebral hemispheres? The possibility of such ‘duplicated processing’ seems puzzling in terms of neural resource usage, and we currently lack a precise characterization of the lateral differences in face processing. To address this need, we have undertaken a three-pronged approach. Using functional magnetic resonance imaging, we assessed cortical sensitivity to facial semblance, the modulatory effects of context and temporal response dynamics. Results on all three fronts revealed systematic hemispheric differences. We found that: (i) activation patterns in the left fusiform gyrus correlate with image-level face-semblance, while those in the right correlate with categorical face/non-face judgements. (ii) Context exerts significant excitatory/inhibitory influence in the left, but has limited effect on the right. (iii) Face-selectivity persists in the right even after activity on the left has returned to baseline. These results provide important clues regarding the functional architecture of face processing, suggesting that the left hemisphere is involved in processing ‘low-level’ face semblance, and perhaps is a precursor to categorical ‘deep’ analyses on the right.
MIT Department
Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1098/rspb.2011.1784
