Document Detail


Neural responses related to point-light walker perception: a magnetoencephalographic study.
MedLine Citation:
PMID:  18930697     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: The aim of this study is to extract magnetoencephalographic responses relating to the processing of point-light walker (PLW). METHODS: To attenuate neural activities in the lower visual areas, we presented a scrambled-PLW as a first stimulus and then either an upright- or inverted-PLW/scrambled-PLW as a second stimulus. Each point of the scrambled-PLW stimulus had the same velocity vector as the points of the PLW stimulus, but points were interchanged randomly. RESULTS: The peak neuromagnetic response to the first stimulus was observed at around 250ms after stimulus onset, whereas the peak latency in response to second stimulus was around 350ms after stimulus onset. The peak amplitude induced by the PLW stimulus was significantly larger than that by the scrambled-PLW during the second stimulus. Moreover, the signal source of the responses to the PLW was estimated to lie in the occipitotemporal region, more anterior than the source of the response to the first stimulus. CONCLUSIONS: These findings indicate that the response to the first stimulus reflects general motion processing, while responses to the second stimuli are involved in PLW processing. SIGNIFICANCE: This is the first evidence to specify a single neuromagnetic response to a PLW stimulus.
Authors:
Masahiro Hirai; Yoshiki Kaneoke; Hiroki Nakata; Ryusuke Kakigi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-18
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  119     ISSN:  1872-8952     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-28     Completed Date:  2009-04-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  2775-84     Citation Subset:  IM    
Affiliation:
Department of Integrative Physiology, National Institute for Physiological Sciences, 38 Nishigonaka, Myoudaiji, Okazaki, 444-8585, Japan; Japan Society for the Promotion of Science (JSPS), Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Brain / anatomy & histology,  physiology*
Brain Mapping*
Female
Functional Laterality
Humans
Magnetic Resonance Imaging / methods
Magnetoencephalography*
Male
Photic Stimulation / methods
Reaction Time / physiology
Visual Fields / physiology
Visual Perception / physiology*
Walkers*

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


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