Document Detail

Postural effects on manual reaching laterality in squirrel monkeys (Saimiri sciureus) and cotton-top tamarins (Saguinus oedipus).
MedLine Citation:
PMID:  8112050     Owner:  NLM     Status:  MEDLINE    
Squirrel monkeys (Saimiri sciureus) and cotton-top tamarins (Saguinus oedipus) made unimanual food reaches from either a horizontal, quadrupedal posture or a vertical, clinging posture. No population-level handedness occurred in either species. However, in both species, directional lateral preferences weakly expressed for reaching from the stable quadrupedal posture were intensified in the vertical cling posture. This phenomenon, which we designate as soft handedness, may have been an evolutionary precursor to population-level handedness. Right or left turning by the squirrel monkeys before reaching closely predicted use of the right or left hand. However, the magnitude of the association decreased in the more highly lateralized vertical cling condition. This result suggests that as lateral hand preference increases, hand use may become increasingly independent of constraints from prior behavioral and environmental influences.
L S Roney; J E King
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of comparative psychology (Washington, D.C. : 1983)     Volume:  107     ISSN:  0735-7036     ISO Abbreviation:  J Comp Psychol     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-03-31     Completed Date:  1994-03-31     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8309850     Medline TA:  J Comp Psychol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  380-5     Citation Subset:  IM    
Department of Psychology, University of Arizona, Tucson 85721.
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MeSH Terms
Functional Laterality*
Postural Balance
Psychomotor Performance*
Saguinus / psychology*
Saimiri / psychology*
Social Environment

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