Performance of younger and older adults in lateralized right and left hemisphere asymmetry tasks supports the HAROLD model

Détails

ID Serval
serval:BIB_16C4BA3B68E3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Performance of younger and older adults in lateralized right and left hemisphere asymmetry tasks supports the HAROLD model
Périodique
Laterality
Auteur(s)
Collins K., Mohr C.
ISSN
1357-650X
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
18
Numéro
4
Pages
491-512
Langue
anglais
Résumé
The population of industrialized societies has increased tremendously over the last century, raising the question on how an enhanced age affects cognition. The relevance of two models of healthy aging are contrasted in the present study that both target the functioning of the two cerebral hemispheres. The right hemi-aging 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 (lateralized lexical decisions) and a right (sex decisions on chimeric faces) hemisphere advantage. Results indicated that lateralized 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
Mots-clé
Ageing, Hemispheric asymmetry, Laterality, Right hemi-ageing model, RHAM, Chimeric faces, Lexical decisions, Perceptual bias
Création de la notice
20/08/2012 19:54
Dernière modification de la notice
20/08/2019 13:46
Données d'usage