Visuospatial working memory deficits and visual pursuit impairments are not directly related in schizophrenia.

Détails

ID Serval
serval:BIB_E310FF73BA93
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Visuospatial working memory deficits and visual pursuit impairments are not directly related in schizophrenia.
Périodique
Australian and New Zealand Journal of Psychiatry
Auteur(s)
Cocchi L., Bosisio F., Carter O., Wood S.J., Berchtold A., Conus P., Orita A., Debbané M., Schenk F.
ISSN
1440-1614[electronic]
Statut éditorial
Publié
Date de publication
2009
Peer-reviewed
Oui
Volume
43
Numéro
8
Pages
766-774
Langue
anglais
Notes
Publication types: Journal Article
Résumé
OBJECTIVE: Patients with schizophrenia show deficits in visuospatial working memory and visual pursuit processes. It is currently unclear, however, whether both impairments are related to a common neuropathological origin. The purpose of the present study was therefore to examine the possible relations between the encoding and the discrimination of dynamic visuospatial stimuli in schizophrenia. METHOD: Sixteen outpatients with schizophrenia and 16 control subjects were asked to encode complex disc displacements presented on a screen. After a delay, participants had to identify the previously presented disc trajectory from a choice of six static linear paths, among which were five incorrect paths. The precision of visual pursuit eye movements during the initial presentation of the dynamic stimulus was assessed. The fixations and scanning time in definite regions of the six paths presented during the discrimination phase were investigated. RESULTS: In comparison with controls, patients showed poorer task performance, reduced pursuit accuracy during incorrect trials and less time scanning the correct stimulus or the incorrect paths approximating its global structure. Patients also spent less time scanning the leftmost portion of the correct path even when making a correct choice. The accuracy of visual pursuit and head movements, however, was not correlated with task performance. CONCLUSIONS: The present study provides direct support for the hypothesis that active integration of visuospatial information within working memory is deficient in schizophrenia. In contrast, a general impairment of oculomotor mechanisms involved in smooth pursuit did not appear to be directly related to lower visuospatial working memory performance in schizophrenia.
Pubmed
Web of science
Création de la notice
17/08/2009 14:28
Dernière modification de la notice
20/08/2019 17:06
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