Integrative parietal cortex processes: neurological and psychiatric aspects.

Handedness is generally considered to be an important variable in neuropsychological studies of cerebral organization. Although the precise relationship between handedness and brain organization has yet to be specified, the assertion that left-handers are somehow different is rarely questioned. The present paper has two main goals. The first is to review the evidence that handedness and other lateral preference variables are, in fact, related to cerebral organization. The second is to examine the way in which handedness is measured, in order to see which measures of lateral preference are most likely to be related to functional brain lateralization.

Handedness and Cerebral Organization: Data from Clinical and Normal Populations

Left-handed and right-handed aphasics with left hemisphere lesions compared on nonverbal performance measures.

We report 20 cases of right unilateral spatial neglect caused by lesions in the left cerebral hemisphere. Differences in neuropsychological symptoms and lesions sites are discussed in connection with handedness. Of the right-handed patients, 6 had severe aphasia, 4 had Gerstmann's syndrome, and 1 had pure agraphia, but unilateral spatial neglect in these cases disappeared after a number of months. Six of the non-right-handed patients had moderate-to-severe aphasia, while the other 3 cases had no aphasia at all. Eight of the 9 cases in this group continued to have right unilateral spatial neglect for more than 6 months. Lesion site as determined by CT differed as to hemisphere, but all fell into the common area previously mentioned in connection with such disorders: i.e., the temporal, parietal and occipital lobes.

A study of right unilateral spatial neglect in left hemispheric lesions: the difference between right-handed and non-right-handed post-stroke patients.

This paper is concerned with what abnormal handedness in Pervasive Developmental Disorders (PDD) reveals about the presence, lateralization, and severity of cerebral dysfunction in this population. From previous work, it was predicted that left-handedness would be elevated in the sample and that mixed-handedness subjects should be more impaired than those with established hand dominance. A battery of cognitive and motor tests were administered to a group of PDD children with autistic symptoms, and performance was compared for the left-handed, right-handed, and mixedpreference children. It was found that left-handers tended to do better than right-handers on all cognitive measures, while the mixed-preference children tended to be the lowest on all cognitive measures. No differences were found on motor measures. An extension of the Satz (1972) model, assuming early brain damage, was developed to explain the superiority of the left-handed children; an alternative explanation assuming anomalous lateralization patterns in the natural left-handers was also suggested.

Handedness and cognitive functions in pervasive developmental disorders.

Visuospatial performance in left-handed patients with unilateral brain lesions

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Visuospatial performance in left-handed patients with unilateral brain lesions