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Inverse mapping the neuronal substrates of face categorizations.
Cereb Cortex. 2009 Oct; 19(10):2428-38.CC

Abstract

Face perception is a complex process involving a network of brain structures, dynamically processing information to enable judgments about a face to be made (e.g., familiarity, identity, and expression). Here we introduce an analysis methodology that makes it possible to directly study this information processing in the brain from spatially and temporally resolved magnetoencephalographic signals. We apply our methodology to the study of 2 face categorization tasks, gender and expressiveness, and track the processing of 3 key visual features that underlie behavioral performance, over time and throughout the cortex. We find information processing correlates beginning from 90 ms following stimulus onset, where features are processed in isolation in occipital extrastriate regions. Over time, processing of successively more features and feature combinations takes place in occipitotemporal regions, with maximal information processing of visual information coinciding with the well-established face-selective M170 component at 170 ms. Later still, around 250-400 ms, cortical activity responds significantly more to task-specific features and their complex combinations. These results indicate a complex process of visual information processing during face perception with face parts processed in isolation at very early stages, and task-specific processing of combinations of features taking place within 300 ms. Crucially, our approach specifically establishes which information in the visual stimulus the brain signal is responding to and how this varies with time, cortical location, and task demands to establish a more precise tracking of information processing mechanisms in the cortex during face perception.

Authors+Show Affiliations

MRC Cognition and Brain Sciences Unit, Cambridge, UK. marie.smith@mrc-cbu.cam.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19168662

Citation

Smith, Marie L., et al. "Inverse Mapping the Neuronal Substrates of Face Categorizations." Cerebral Cortex (New York, N.Y. : 1991), vol. 19, no. 10, 2009, pp. 2428-38.
Smith ML, Fries P, Gosselin F, et al. Inverse mapping the neuronal substrates of face categorizations. Cereb Cortex. 2009;19(10):2428-38.
Smith, M. L., Fries, P., Gosselin, F., Goebel, R., & Schyns, P. G. (2009). Inverse mapping the neuronal substrates of face categorizations. Cerebral Cortex (New York, N.Y. : 1991), 19(10), 2428-38. https://doi.org/10.1093/cercor/bhn257
Smith ML, et al. Inverse Mapping the Neuronal Substrates of Face Categorizations. Cereb Cortex. 2009;19(10):2428-38. PubMed PMID: 19168662.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inverse mapping the neuronal substrates of face categorizations. AU - Smith,Marie L, AU - Fries,P, AU - Gosselin,F, AU - Goebel,R, AU - Schyns,P G, Y1 - 2009/01/23/ PY - 2009/1/27/entrez PY - 2009/1/27/pubmed PY - 2009/12/16/medline SP - 2428 EP - 38 JF - Cerebral cortex (New York, N.Y. : 1991) JO - Cereb Cortex VL - 19 IS - 10 N2 - Face perception is a complex process involving a network of brain structures, dynamically processing information to enable judgments about a face to be made (e.g., familiarity, identity, and expression). Here we introduce an analysis methodology that makes it possible to directly study this information processing in the brain from spatially and temporally resolved magnetoencephalographic signals. We apply our methodology to the study of 2 face categorization tasks, gender and expressiveness, and track the processing of 3 key visual features that underlie behavioral performance, over time and throughout the cortex. We find information processing correlates beginning from 90 ms following stimulus onset, where features are processed in isolation in occipital extrastriate regions. Over time, processing of successively more features and feature combinations takes place in occipitotemporal regions, with maximal information processing of visual information coinciding with the well-established face-selective M170 component at 170 ms. Later still, around 250-400 ms, cortical activity responds significantly more to task-specific features and their complex combinations. These results indicate a complex process of visual information processing during face perception with face parts processed in isolation at very early stages, and task-specific processing of combinations of features taking place within 300 ms. Crucially, our approach specifically establishes which information in the visual stimulus the brain signal is responding to and how this varies with time, cortical location, and task demands to establish a more precise tracking of information processing mechanisms in the cortex during face perception. SN - 1460-2199 UR - https://www.unboundmedicine.com/medline/citation/19168662/Inverse_mapping_the_neuronal_substrates_of_face_categorizations_ L2 - https://academic.oup.com/cercor/article-lookup/doi/10.1093/cercor/bhn257 DB - PRIME DP - Unbound Medicine ER -