Right Hemisphere Dominance for Certain Non-Verbal Intellectual Skills

Genetic contributions to white matter architecture revealed by diffusion tensor imaging in Williams syndrome

“…This finding suggests the presence of abnormal lateralization of white matter development in WS, with preferential right hemisphere involvement. This observation may be compatible with the deficits in visuospatial construction and social cognition in WS, functions that are normally associated with the right hemisphere (29,30). The lack of physiological asymmetry found here is also reminiscent of bilaterally symmetric abnormalities in sulcal depth reported by Van Essen et al (12) and of loss of asymmetry of the planum temporale reported by Eckert et al (31).…”

Constructional Apraxia and the Minor Hemisphere

“…Their ten tativ e conclusion is th a t bo th an " executive" or " apractic" type of the disorder (as postulated by Kleist) and a " visuoperccptive" or " spatio-agnosic" type do exist. On the other hand, even more recent studies by Piercy and Smyth (1962) and Arrigoni and De Renzi (1964) have yielded findings th a t do not su p port the validity or clinical im portance of such a distinction. There have also been a ttem p ts to infer the existence of discrete types of constructional apraxia from a stu d y of qualitative features of perform ance.…”

Hemispheric Dominance: Its Development and Relation to Speech Disorders

“…These qualitative differences in constructional performance are difficult to measure, and the production of the patients is not considered sufficient to differentiate the laterality of the lesions [Piercy and Smyth, 1962]. In right-hemi sphere damage, constructional difficulties may be related to visuoperceptual defects as matching tasks are often impaired (visuospatial agnosia).…”