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| Research article summary (published 30 Dec 2002): |
Interhemispheric cooperation for face recognition but not for affective facial expressions.
Full Abstract
Interhemispheric cooperation can be indicated by enhanced performance when stimuli are presented to both visual fields relative to one visual field alone. This "bilateral gain" is seen for words but not pseudowords in lexical decision tasks, and has been attributed to the operation of interhemispheric cell assemblies that exist only for meaningful words with acquired cortical representations. Recently, a bilateral gain has been reported for famous but not unfamiliar faces in a face recognition task [Neuropsychologia 40 (2002) 1841]. In Experiment 1 of the present paper, participants performed familiarity decisions for faces that were presented to the left (LVF), the right (RVF), or to both visual fields (BVF). An advantage for BVF relative to both LVF and RVF stimuli was seen in reaction times (RTs) to famous faces, but this bilateral advantage was absent for unfamiliar faces. In Experiment 2, participants classified the expression (happy or neutral) of unfamiliar faces. No bilateral advantage was seen for expressions, although a right hemisphere superiority was seen in terms of higher accuracy for LVF and BVF trials relative to the RVF. Recognition of famous faces (but not of facial expressions) require access to acquired memory representations that may be instantiated via cortical cell assemblies, and it is suggested that interhemispheric cooperation depends on these acquired cortical representations.
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Author information
Author/s: Schweinberger, Stefan R (SR); Baird, Lyndsay M (LM); Blümler, Margarethe (M); Kaufmann, Jürgen M (JM); Mohr, Bettina (B);
Affiliation: Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow G12 8QQ, UK. s.schweinberger(-atsign-)psy.gla.ac.uk
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Neuropsychologia (Neuropsychologia), published in England. (Language: eng)
Reference: 2003-; vol 41 (issue 4) : pp 407-14
Dates: Created 2003/01/31; Completed 2003/04/07; Revised 2006/11/15;
PMID: 12559158, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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