Document Detail


Performance of younger and older adults in lateralised right and left hemisphere asymmetry tasks supports the HAROLD model.
MedLine Citation:
PMID:  23030582     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The population of industrialised societies has increased tremendously over the last century, raising the question of how an enhanced age affects cognition. The relevance of two models of healthy ageing are contrasted in the present study that both target the functioning of the two cerebral hemispheres. The right hemi-ageing model (RHAM) assumes that functions of the right hemisphere decline before those of the left hemisphere. The Hemispheric Asymmetry Reduction in Older Adults (HAROLD) model suggests that the contralateral hemisphere supports the normally superior hemisphere in a given task resulting in a reduced hemispheric asymmetry overall. In a mixed design 20 younger and 20 older adults performed both a task assessing a left (lateralised lexical decisions) and a right (sex decisions on chimeric faces) hemisphere advantage. Results indicated that lateralised performance in both tasks was attenuated in older as compared to younger adults, in particular in men. These observations support the HAROLD model. Future studies should investigate whether this reduced functional hemispheric asymmetry in older age results from compensatory processes or from a process of de-differentiation.
Authors:
Kevin Collins; Christine Mohr
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-3
Journal Detail:
Title:  Laterality     Volume:  -     ISSN:  1464-0678     ISO Abbreviation:  Laterality     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9609064     Medline TA:  Laterality     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Institute of Psychology , University of Lausanne , Lausanne , Switzerland.
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