Brain, Vol. 113, No. 2, 475-486, 1990
© 1990 Oxford University Press
research-article |
DIRECTIONAL HYPOKINESIA AND HEMISPATIAL INATTENTION IN NEGLECT
1Temple University school of Medicine Philadelphia, PA 2University of Florida College of Medicine Gainesville, Florida, USA 3Veterans Administration Medical Center Gainesville, Florida, USA
Correspondence to:
Correspondence to: Dr H. B. Coslett, Department of Neurology, Temple University Hospital, 3401 N. Broad Street, Philadelphia, PA 19140, USA.
Subjects with neglect of left hemispace may err to the right when bisecting lines. This error has been attributed either to a directional hypokinesia (failure to execute movements fully in or towards the contralateral hemispace) or to a failure to attend to or represent sensory information. Four subjects with neglect were tested on a line bisection task in which these two hypotheses were differentiated by preventing direct viewing of the line and instead using a video camera and monitor, each of which could be moved independently into right or left hemispace. The performance of 2 subjects was consistent with the predictions of the directional hypokinesia hypothesis; the performance of the other 2 subjects was consistent with the attention-representation deficit hypothesis. These data suggest that both a directional hypokinesia and an attention-represeniation deficit may each be a primary determinant of neglect.
Received October 25, 1988. Revised June 2, 1989. Accepted June 9, 1989.
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