Document Detail

Estimation of interhemispheric dynamics from simple unimanual reaction time to extrafoveal stimuli.
MedLine Citation:
PMID:  1306109     Owner:  NLM     Status:  MEDLINE    
This essay reviews research on interhemispheric transfer time derived from simple unimanual reaction time to hemitachistoscopically presented visual stimuli. Part 1 reviews major theoretical themes including (a) the significance of the eccentricity effect on interhemispheric transfer time in the context of proposed underlying neurohistological constraints; (b) the significance of gender differences in interhemispheric transfer time and findings in dyslexics and left-handers in the context of a fetal brain testosterone model; and (c) the significance of complexity effects on interhemispheric transfer time in a context of "dynamic" vs. "hard-wired" concepts of the underlying interhemispheric communication systems. Part 2 consists of a meta-analysis of 49 published behavioral experiments, in view of drawing a portrait of the best set of experimental conditions apt to produce salient, reliable, and statistically significant measures of interhemispheric transfer time, namely (a) index rather than thumb response, (b) low rather than high target luminance, (c) short rather than prolonged target display, and (d) very eccentric rather than near-foveal stimulus location. Part 3 proposes a theoretical model of interhemispheric transfer time, postulating the measurable existence of fast and slow interhemispheric channels. The proposed mechanism's evolutionary adaptive value, the neurophysiological evidence in its support, and favorable functional evidence from studies of callosotomized patients are then presented followed by proposals for critical experimental tests of the model.
C M Braun
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Neuropsychology review     Volume:  3     ISSN:  1040-7308     ISO Abbreviation:  Neuropsychol Rev     Publication Date:  1992 Dec 
Date Detail:
Created Date:  1993-07-30     Completed Date:  1993-07-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9009029     Medline TA:  Neuropsychol Rev     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  321-65     Citation Subset:  IM; S    
Laboratoire de Neurosciences Cognitives, (UQAM), Université du Québecà Montréal, Canada.
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MeSH Terms
Brain / physiology
Corpus Callosum / physiology*
Decision Making
Functional Laterality / physiology*
Reaction Time / physiology*
Sex Factors
Visual Fields
Visual Perception / physiology*

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