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Amplitude spectrum EEG signal evidence for the dissociation of motor and perceptual spatial working memory in the human brain.
MedLine Citation:
PMID:  24281356     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study investigated the question whether spatial working memory related to movement plans (motor working memory) and spatial working memory related to spatial attention and perceptual processes (perceptual spatial working memory) share the same neurophysiological substrate or there is evidence for separate motor and perceptual working memory streams of processing. Towards this aim, ten healthy human subjects performed delayed responses to visual targets presented at different spatial locations. Two tasks were attained, one in which the spatial location of the target was the goal for a pointing movement and one in which the spatial location of the target was used for a perceptual (yes or no) change detection. Each task involved two conditions: a memory condition in which the target remained visible only for the first 250 ms of the delay period and a delay condition in which the target location remained visible throughout the delay period. The amplitude spectrum analysis of the EEG revealed that the alpha (8-12 Hz) band signal was smaller, while the beta (13-30 Hz) and gamma (30-45 Hz) band signals were larger in the memory compared to the non-memory condition. The alpha band signal difference was confined to the frontal midline area; the beta band signal difference extended over the right hemisphere and midline central area, and the gamma band signal difference was confined to the right occipitoparietal area. Importantly, both in beta and gamma bands, we observed a significant increase in the movement-related compared to the perceptual-related memory-specific amplitude spectrum signal in the central midline area. This result provides clear evidence for the dissociation of motor and perceptual spatial working memory.
Authors:
Nikolaos Smyrnis; Foteini Protopapa; Evangelos Tsoukas; Allison Balogh; Constantinos I Siettos; Ioannis Evdokimidis
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-11-27
Journal Detail:
Title:  Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale     Volume:  -     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Cognition and Action Group, Neurology Department, Aeginition Hospital, National and Kapodistrian University of Athens, Athens, Greece, smyrnis@med.uoa.gr.
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