Marie-Thérèse Perenin investigated optic ataxia through visually guided arm movements in people with parietal brain lesions. The comparison asks how visual information guides an action rather than treating accurate seeing and accurate reaching as one ability. Lesion location, visual-field conditions and the movement being tested help distinguish the particular visuomotor difficulty. [ref]
Optic ataxia: a specific disruption in visuomotor mechanisms by Marie-Thérèse Perenin and others. 1988, filmed reaching and unilateral parietal-lesion comparisons
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