Document Detail

Inverted handwriting posture in left handers is related to familial sinistrality incidence.
MedLine Citation:
PMID:  2612177     Owner:  NLM     Status:  MEDLINE    
McKeever (1979) reported that left handers who wrote with an inverted handwriting posture (IHP) had a higher incidence of left handedness in their families than did left handers who wrote with a non-inverted handwriting posture (NHP). Parlow and Kinsbourne (1981), however, failed to find a relationship between handwriting posture (HWP) and positive familial sinistrality (FS+). McKeever had classified his left handed subjects according to whether they had several, one, or no left handers among their first degree relatives and biologically-related second degree relatives. Parlow and Kinsbourne classified subjects as FS- or FS+ on the basis of first degree relatives and did not inquire about the handedness of second degree relatives. In the present study, handedness for writing of all first and second degree relatives was recorded for 216 NIP and 255 IHP left handers. Results showed a significant association of HWP and FS factors when second degree relatives were considered, but not when second degree relative handedness was ignored. The relationship was strongest within the maternal family line, where the proportion of left handers was more than twice as high for the IHP as for the NHP group. These findings suggest that HWP may well be of some importance for a complete understanding of the cerebral organization of left handers.
W F McKeever; P P VanEys
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cortex; a journal devoted to the study of the nervous system and behavior     Volume:  25     ISSN:  0010-9452     ISO Abbreviation:  Cortex     Publication Date:  1989 Dec 
Date Detail:
Created Date:  1990-03-13     Completed Date:  1990-03-13     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0100725     Medline TA:  Cortex     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  581-9     Citation Subset:  IM    
Northern Arizona University.
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MeSH Terms
Family / psychology*
Family Characteristics
Functional Laterality*
Sex Characteristics

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

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