Research has revealed interhemispheric specialization for different forms of memory (Korsakova & Mikadze, 1982; Simernitskaya, 1978) as well as greater vulnerability of the right hemisphere to cerebral pathology and lower compensating capabilities (Vasserman & Lassan, 1989). The right hemisphere was proved slower in information processing than the left one (Krotkova, Karaseva, Moskovichyute, 1982) and less able to regulate and accelerate mental activity (Homskaya, Efimova, Budyka, & Enikolopova, 1997). It was also shown that each hemisphere is specific for different types of reasoning such as empirical or logical reasoning as well as for intensity and stability of human emotions, and there are unilaterally and bilaterally realized functions, or a competence of each hemisphere (Homskaya & Batova, 1998; Meerson & Dobrovolskaya, 1998). Each mental activity is realized through the interaction of both hemispheres, each making a specific contribution. New evidence proves that interhemispheric differences can be revealed both on cortical and subcortical levels. Cognitive defects specific for the left hemisphere are more evident in cortical lesions, whereas subdominant syndromes appear predominantly after subcortical lesions of the right hemisphere (Moskovichyute, 1998).
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