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Handedness concordance and intelligence discrepancies in identical twins.
MedLine Citation:
PMID:  14591415     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine if the discrepancy in measured intelligence between identical twins concordant for handedness differed measureably from the discrepancy between identical twins discordant for handedness. If handed concordant and discordant twins did differ in terms of the between twin discrepancy in measured intelligence, then one could infer that congenital factors had caused dissociation of handedness and measured intelligence within a twin set. This finding would support Nagylaki and Levy's contention that the found discordance rates for handedness in identical twins is a function of "pathogenic" congenital factors disrupting the genetically determined handedness pattern. More generally, this finding would also support Satz's model with respect to pathological shifts in handedness due to brain insult either in utero or perinatally. However, in the current study, eight sets of identical twins were examined and no evidence was found to support these hypotheses. Instead, in one set where there was a marked discrepancy in measured intelligence, handedness could not be determined precisely for the twin with the lower intelligence quotient.
Authors:
C M Clark; H Klonoff; J S Tyhurst
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists     Volume:  1     ISSN:  0887-6177     ISO Abbreviation:  Arch Clin Neuropsychol     Publication Date:  1986  
Date Detail:
Created Date:  2003-10-31     Completed Date:  2004-01-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9004255     Medline TA:  Arch Clin Neuropsychol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  351-6     Citation Subset:  -    
Affiliation:
Department of Psychiatry, University of British Columbia, Vancouver, Canada.
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