Document Detail

The effect of response competition on functional hemispheric asymmetries for global/local processing.
MedLine Citation:
PMID:  12519026     Owner:  NLM     Status:  MEDLINE    
It is widely assumed that the cerebral hemispheres differ in their capacity for processing the global and local levels of hierarchical stimuli. However, corresponding visual-field (VF) effects in response time studies did not show up under all circumstances. In the present article the role of response conflict between the levels for the occurrence of these effects is investigated. Three experiments with hierarchical letters are reported, in which the absolute and/or the relative interference between the stimulus levels was varied. It turned out that VF effects occurred only for conflicting stimuli and only when there was at least a certain amount of absolute interference, whereas variations of the relative interference had no effect in this respect. These results suggest that there is a qualitative relationship between interference and VF effects. A possible explanation is provided by the assumption that the hemispheres are functionally equivalent with respect to early stimulus representations, whereas they differ in their efficiency for integrating letter identity and stimulus level.
Ronald Hübner; Peter Malinowski
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception & psychophysics     Volume:  64     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2003-01-09     Completed Date:  2003-02-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1290-300     Citation Subset:  IM    
Universität Konstanz, Fachbereich Psychologie, Konstanz, Germany.
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MeSH Terms
Brain / physiology*
Functional Laterality / physiology*
Random Allocation
Reaction Time
Visual Fields / physiology
Visual Perception / physiology*

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