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Optic ataxia represents a spatial impairment of visually guided reaching following bilateral or unilateral damage to the posterior parietal cortex that is independent of purely motor or visual deficits. Research to date has focused on reaching actions performed with the upper limbs but has neglected to explore whether or not optic ataxia affects the lower limbs, that is, whether it is effector-specific...
Optic ataxia is defined as a spatial impairment of visually guided reaching, but it is typically accompanied by other visuomotor difficulties, notably a failure to scale the handgrip appropriately while reaching to grasp an object. This impaired grasping might reflect a primary visuomotor deficit, or it might be a secondary effect arising from the spatial uncertainty associated with poor reaching...
Optic ataxic patients have deficits in the visual control of manual reaching and grasping. It has been established previously that these deficits in target-directed behaviour improve following a delay in response. Recently it has been demonstrated that optic ataxic patients also have deficits in taking potential obstacles into account during reaching. The present study was therefore designed to test...
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