The effect of goals and vision on movements: a case study of optic ataxia and limb apraxia

Brain and Cognition
Elisabetta AmbronRaffaella I Rumiati

Abstract

Normally we can perform a variety of goal-directed movements effortlessly. However, damage to the parietal cortex may dramatically reduce this ability, giving rise to optic ataxia and limb apraxia. Patients with optic ataxia show clear misreaches towards targets when presented in the peripheral visual field, whereas limb apraxia refers to the inability to use common tools or to imitate simple gestures. In the present paper we describe the case of a left-brain damaged patient, who presented both symptoms. We systematically investigated both spatial and temporal parameters of his movements, when asked to reach and grasp common objects to move (Experiment 1) or to use them (Experiment 2), presented either in the central or peripheral visual field. Different movement parameters changed in relation to the goal of the task (grasp to move vs. grasp to use), reflecting a normal modulation of the movement to accomplish tasks with different goals. On the other hand, grip aperture appeared to be more affected from both task goal and viewing condition, with a specific decrement observed when CF was asked to use objects presented peripherally. On the contrary, a neat effect of the viewing condition was observed in the spatial distribution o...Continue Reading

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Citations

Jul 15, 2015·Neuropsychologia·Vonne van Polanen, Marco Davare
Aug 4, 2016·Neuroscience and Biobehavioral Reviews·Katrin SakreidaFerdinand Binkofski

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