Damage to superior parietal cortex impairs pointing in the sagittal Plane |
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Authors: | James Danckert Lana Goldberg Carol Broderick |
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Institution: | (1) Department of Psychology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada |
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Abstract: | Neurophysiology and neuroimaging research implicates distinct regions of posterior parietal cortex for reaching versus grasping
and for completing these movements in central versus peripheral space. Typically, visuomotor tasks only examine movements
made in the frontoparallel plane. We examined a patient with a right superior parietal lesion encompassing the parietal-occipital
junction, the intraparietal sulcus and the putative human homologue of V6A on pointing tasks in the sagittal or frontoparallel
planes. The patient did not demonstrate a speed-accuracy trade-off, but did show larger times post-peak velocity for all movement
directions. Her movements in the sagittal axis were more disordered than movements in the frontoparallel plane. These data
indicate a role for superior parietal cortex in fine tuning of visually guided movements and more particularly for movements
made back towards the body.
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Keywords: | Visuomotor control Parietal lobe Optic ataxia |
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