Hemispatial and directional performance biases in motor neglect.

Abstract:

:Motivationally responsive motor deficits may occur in isolation or as part of more general neglect syndromes. We describe three patients with two discrete syndromes of isolated motor neglect, differentiated primarily by their performance in motor tasks enacted within or toward the contralesional hemispace. The lesions in our patients likely disrupted attentional interactions with two separable sensorimotor processing subsystems. Physiologic data support the existence of a parietal-lateral premotor circuit that processes information encoded in spatial coordinates referenced to the extrapersonal environment and of a basal ganglionic-mesial premotor circuit that processes information mostly encoded in egocentric skeletomotor coordinates. The correlation of ischemic lesions resulting in hemispatial and directional biases in motor neglect with disruption of known physiologic subsystems may provide the basis for rational cognitive rehabilitation of these higher-order motor deficits. These observations are supported by recent PET studies that document the presence of specific attentional-motoric interactions within discrete processing components of a distributed sensorimotor attentional network.

journal_name

Neurology

journal_title

Neurology

authors

Simon ES,Hegarty AM,Mehler MF

doi

10.1212/wnl.45.3.525

subject

Has Abstract

pub_date

1995-03-01 00:00:00

pages

525-31

issue

3 Pt 1

eissn

0028-3878

issn

1526-632X

journal_volume

45

pub_type

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