Document Detail

Event-related potentials during digit recognition tasks.
MedLine Citation:
PMID:  9774727     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: An event-related potential (ERP) correlate of visual short-term memory (VMP) has been identified in our laboratory. This study aims to determine how stimulus load modulates recognition processing of digits. METHODS: ERPs were recorded from 117 healthy right-handed subjects during a delayed matching-to-sample paradigm, using number stimuli that were either low load (three digits long) or high load (five digits long). The bootstrap method [R. Srebro, A bootstrap method to compare the shapes of two scalp fields, Electroenceph. Clin. Neurophysiol. 100 (1996) 25-32.] was employed to evaluate the topographic features of the VMP revealed in the current source density (CSD) maps. RESULTS: Response times were significantly shorter for matching stimuli than for non-matching stimuli only for low loads; longer response times were related to higher loads compared to low loads only for matching stimuli. The high loads were related to larger ERP responses. The ERP was significantly smaller for matching than for non-matching three-digit numbers, but not for five-digit numbers. The ERP was also reduced to the test stimuli compared to sample stimuli regardless of stimulus load. Both temporal and frontal regions were involved in the recognition of the digit stimuli, and the left hemisphere was more active in the non-matching processing of digits. CONCLUSIONS: The VMP spatial pattern in addition to its amplitude is sensitive to stimulus load in the encoding process.
J Ji; B Porjesz; D Chorlian; H Begleiter
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Brain research. Cognitive brain research     Volume:  7     ISSN:  0926-6410     ISO Abbreviation:  Brain Res Cogn Brain Res     Publication Date:  1998 Oct 
Date Detail:
Created Date:  1998-12-11     Completed Date:  1998-12-11     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9214304     Medline TA:  Brain Res Cogn Brain Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  179-90     Citation Subset:  IM    
Copyright Information:
Copyright 1998 Elsevier Science B.V.
State University of New York, Health Science Center at Brooklyn, NY 11203, USA.
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MeSH Terms
Cognition / physiology*
Conditioning (Psychology)
Evoked Potentials / physiology
Memory, Short-Term / physiology*
Pattern Recognition, Visual / physiology*
Photic Stimulation
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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