Document Detail

Vibrotactile stimulus order effects in somatosensory cortical areas of rhesus monkeys.
MedLine Citation:
PMID:  9875549     Owner:  NLM     Status:  MEDLINE    
This study demonstrated effects of stimulus order on single-cell responses in the macaque primary and secondary somatosensory and 7b cortical areas. As part of a study of tactile attention, two monkeys (Macaca mulatta) received similar constant amplitude, sinusoidal tactile vibration patterns (125 Hz) at two glabrous skin, hand locations. The stimuli started asynchronously with offsets of 150 or 300 ms. In cells with bilateral receptive fields and increased firing to a stimulus, we observed an average lowering of 30% in the firing rates to the contralateral stimulus when preceded by stimulation of the ipsilateral hand. Some cells with only contralateral receptive fields showed similar depressed responses to a contralateral stimulus when preceded by an ipsilateral stimulus. Stimulus order effects were more prominent during dual stimulation of the receptive field on one hand. In six cells whose background activity was inhibited by the first stimulus, higher rates appeared at the onset of the second stimulus. These results suggest a possible substrate for psychophysical findings of stimulus masking in which a preceding stimulus depresses detection thresholds. The spatial and temporal characteristics of in-field inhibitory mechanisms best account for the observed stimulus order effects.
H Burton; R J Sinclair; K Whang
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Somatosensory & motor research     Volume:  15     ISSN:  0899-0220     ISO Abbreviation:  Somatosens Mot Res     Publication Date:  1998  
Date Detail:
Created Date:  1999-03-23     Completed Date:  1999-03-23     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8904127     Medline TA:  Somatosens Mot Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  316-24     Citation Subset:  IM    
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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MeSH Terms
Attention / physiology*
Functional Laterality / physiology
Linear Models
Macaca mulatta
Physical Stimulation
Somatosensory Cortex / physiology*
Touch / physiology*
Ulna / physiology
Grant Support

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