Abstract
Two groups of right handed, male stroke patients with lesions confined to the left (LH, n=10) or right (RH, n=10) cerebral hemisphere were tested on visual vertical judgements with isolated line stimuli and lines presented in the context of a tilted frame. The psychometric functions indicate no reduction in the precision of orientation judgements among the brain injured subjects when compared with age-matched controls ( n=6) with cardiovascular disease, but the systematic shift in perceived vertical induced by a tilted visual frame was significantly larger for RH-subjects than for LH-subjects or controls (mean illusion 6 and 3° respectively). The results are interpreted within the “two visual systems”-theory of the rod-and-frame effect and it is suggested that the right hemisphere is dominantly involved in the integration of visual and vestibular input.
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