| Brain potentials and integration of external and internal features into face representations. | |
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MedLine Citation:
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PMID: 18295921 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this ERP study we analyzed how different orders of presentation of external and internal features influence the integration of facial components into face gestalts. Participants carried out a face-feature matching task in which, in each trial, external (E) and internal (I) facial features were presented separately and in sequence, followed by a complete unfamiliar face (matching or mismatching). For the E-I group of participants the order of presentation was external features, internal features and then the complete face. The I-E group viewed the internal features first. Mismatch effects in complete faces were more conspicuous and lasted from about 300 to 600 ms with the order E-I, while those with the order I-E were scarcely observable, and significant only from 450 to 470 ms. The external features tended to elicit a larger P150, while the N170 was preferentially associated with the internal ones. A P360, probably indicating stimulus relevance, was present in both groups for external features, while it was associated with internal features only in the I-E group. These results suggest that in the E-I order the binding of facial features into a single face representation occurs according to a stepwise process which facilitates the integration. In turn, in the I-E order the processing related to the two sets of features appears more dissociated and is of a more componential nature. Moreover, we propose that the external features may be especially relevant for object categorization, while internal features would be more closely related to subsequent configural mechanisms. |
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Authors:
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Ela I Olivares; Jaime Iglesias |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2008-01-26 |
Journal Detail:
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Title: International journal of psychophysiology : official journal of the International Organization of Psychophysiology Volume: 68 ISSN: 0167-8760 ISO Abbreviation: Int J Psychophysiol Publication Date: 2008 Apr |
Date Detail:
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Created Date: 2008-03-18 Completed Date: 2008-06-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8406214 Medline TA: Int J Psychophysiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 59-69 Citation Subset: IM |
Affiliation:
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Biological Psychology and Health Department, Psychology Faculty, Autónoma University of Madrid, Spain. ela.olivares@uam.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cerebral Cortex / physiology* Discrimination (Psychology) / physiology* Evoked Potentials / physiology* Face* Female Field Dependence-Independence Humans Male Pattern Recognition, Visual / physiology* Reaction Time / physiology Recognition (Psychology) / physiology* Reference Values |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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