Severity Scaling of Unilateral Spatial Agnosia (USA) among CVA Patients with Right Hemisphere Lesions. Its Relationship to Locus of Lesions and Prognosis of USA grades.

The associations of clinical evaluation tasks of minor hemisphere symptoms, including unilateral spatial agnosia (USA), spatial agnosias and constructional apraxia, were analysed.    Subjects were 77 right hemisphere damaged patients due to CVA. They showed either left homonemous hemianopia or left visual extinction.    Three tasks, line bisection, counting marbles and finding two points, were highly associated.    Then it was acknowledged that these three tasks constitutes Guttman type scale.    Patients of severe grades, i. e. those showed left side neglect in counting marbles and in finding two points, were also showed various spatial disorders.    Intellectual decline and emotional disturbances did not highly associated with USA severity scale. About 80 % of USA patients had lesions in parietal lobe. Age, etiology and duration from onset of CVA had certain effects on prognosis of USA grades.