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Department of Neurology, College of Medicine, University of Florida, and the Research Service, Veterans Administration Medical Center, Gainesville, FL. Dr. Kooistra is now in private practice in Spartanburg, SC.
Patients with hemispatial neglect fail to cancel lines distributed on one side of a piece of paper. This defect is thought to be induced by a deficit in the neuronal systems that mediate attention, intention, and exploration toward and in the hemispace contralateral to the lesion. However, an alternate (but not mutually exclusive) interpretation is that the patients are either strongly attracted to or impaired in disengaging from the stimuli occupying the other, non-neglected hemispace. We tested ten patients with neglect on two versions of a cancellation test. In the control test they cancelled lines by drawing over them, and in the experimental test they erased lines. There were significantly more omissions in the drawing-over task than in the erasing task. The improved performance when lines were cancelled by removal instead of by marking them suggests that hemispatial neglect is influenced by the presence of stimuli in the non-neglected hemispace.
Address correspondence and reprint requests to Dr. Mark, Department of Neurology, University of Maryland School of Medicine and Hospital, 22 South Greene Street, Baltimore, MD 21201.
Presented in part at the thirty-ninth annual meeting of the American Academy of Neurology, New York, NY, April 1987.
Supported by the Medical Research Service of the Veterans Administration.
Received June 24, 1987. Accepted for publication in final form December 21, 1987.
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