Document Detail

Comparative analyses of the role of postnatal development on the expression of play fighting.
MedLine Citation:
PMID:  10689284     Owner:  NLM     Status:  MEDLINE    
Whether it is that animals are young so that they can play, or whether it is that they play because they are young, play should be more prevalent in species that have a greater degree of postnatal development. This hypothesis is tested by comparative analyses within two mammalian orders (primates and muroid rodents) using independent contrasts. This technique can account for the relative degree of relatedness among the species. For both orders, the complexity or prevalence of play fighting is compared to the degree of prenatal development (neonatal weight/adult weight). In addition, the prevalence of play in primates is compared to prenatal brain development (neonatal brain weight/adult brain weight). Significant negative regressions show that 30% of the variance in the distribution of play in the rodents is accounted for by the degree of prenatal development of body size, and 60% of the variance in play in the primates is accounted for by prenatal brain growth. The findings are thus consistent with the prediction. Species with a greater proportion of their growth occurring postnatally play more and have more complex play than do species with more of their growth occurring prenatally.
S M Pellis; A N Iwaniuk
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Developmental psychobiology     Volume:  36     ISSN:  0012-1630     ISO Abbreviation:  Dev Psychobiol     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-04-04     Completed Date:  2000-04-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  136-47     Citation Subset:  IM    
Copyright Information:
Copyright 2000 John Wiley & Sons, Inc.
Department of Psychology and Neuroscience, University of Lethbridge, Lethbridge, Alberta, Canada T1K 3M4.
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MeSH Terms
Animals, Newborn / physiology
Behavior, Animal / physiology*
Mammals / psychology*
Regression Analysis

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

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