An Investigation of Hemispatial Neglect Using the Landmark Task

• Published in: Brain and cognition Vol. 27; no. 1; pp. 59 - 78
• Main Authors: Harvey, M., Milner, A.D., Roberts, R.C.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.02.1995; Elsevier
• Subjects: Aged; Attention; Brain Damage, Chronic - diagnosis; Brain Damage, Chronic - psychology; Brain Mapping; Cerebrovascular Disorders - diagnosis; Cerebrovascular Disorders - psychology; Dominance, Cerebral; Epistemology. Philosophy of science. Theory of knowledge; Female; Functional Laterality; Hemianopsia - diagnosis; Hemianopsia - psychology; Hemiplegia - diagnosis; Hemiplegia - psychology; Humans; Male; Middle Aged; Neuropsychological Tests; Orientation; Philosophy; Psychomotor Performance; Reference Values; Line; Perception; Neuropsychology; Vision; Middle
• ISSN: 0278-2626; 1090-2147
• DOI: 10.1006/brcg.1995.1004

The ′Landmark Task" is designed to tease apart two major factors in determining line bisection errors in spatial neglect: one whose general nature is perceptual, the other whose nature is motor. On critical test trials, the subject is required to point to whichever end of a mid-transected line is judged as nearer to the transection. Seven out of eight neglect patients pointed consistently to the left end of such lines. Thus their misjudgments were made in the direction opposite to any putative ′directional hypokinesia." One patient, however, pointed predominantly rightward on these test trials. Normal controls and unilateral stroke patients were also tested on the Landmark Task. Cueing of one end of a line led to a relative perceptual overestimation of that half of the line in all of these groups. (C) Academic Press, Inc.