[Associative XXXX : role of the left hemisphere in visual perception (author's transl)].

@entity1 @entity227 @entity132 @entity1833 @entity2026 @entity2414 @entity1054
@entity227 following ischaemic accidents of the left posterior cerebral artery is often associated with @entity2026 , @entity2414 , @entity132 and elements of visuoverbal disconnection, with the result that some authors reject the notion of @entity227 . By using a relatively simple examination procedure it is, however, possible to clearly differentiate the various disturbances, as shown by the case of a right-handed 66-year-old @entity1 in whom this type of vascular accident occurred. Neither the reduced intellectual capacities nor the @entity2414 can explain the differences observed in the treatment of visual stimuli, which was very disturbed, and the normal treatment of other types of stimulus. @entity1833 are not sufficient to prevent correct discrimination, as all tests of matching object, images, colours, and graphic signs were successfully accomplished. Identification was disturbed however: the @entity1 could not show the use of objects presented visually, and this disorder is related to the visual characteristics of the stimuli, which excludes a simple visuogestural disconnection; results of tests of classifying types of object images, colours, and graphic signs were markedly abnormal. Naming of these stimuli was also affected, even when they were correctly identified; this results from the visuoverbal disconnection associated with the @entity1054 , but it is insufficient to account for it, as the @entity1 could correctly use objects that had been wrongly named, but could not use those that had been poorly identified. This case, therefore, has enabled a @entity227 to be isolated independently from a discrimination problem, and visuoverbal or visuogestural disconnections. It is the significance of ths stimulus that is disturbed. In contrast, functional or categorical classification is respected in right temporo-occipital lesions. It is the individuality of a stimulus within a physical category which is disturbed.
