Anisometry of space representation in unilateral neglect: Empirical test of a former hypothesis

Consciousness and Cognition 8 (4):577-584 (1999)
Abstract
When left-neglect patients are required to extend horizontal segments to double their original length, relative left overextension is frequently observed. Less frequently, relative left underextension may also be found. It was hypothesized that this contrast could depend on the degree of horizontal anisometry of the medium for the representation of spatial properties. The present paper reports an experiment conducted in order to test that hypothesis, on the basis of which left overextension should be larger with shorter than with longer segments and with segments lying in the right rather than in the left hemispace. Although supportive, the results unveiled unexpected complications: the expected effect of line length was found only in neglect patients with frontal damage, while the expected effect of side of presentation was found only in neglect patients without frontal damage.
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Anna Berti (2002). Unconscious Processing in Neglect. In Hans-Otto Karnath, David Milner & Giuseppe Vallar (eds.), The Cognitive and Neural Bases of Spatial Neglect. Oxford University Press. 313-326.
E. Bisiach (1993). Mental Representation in Unilateral Neglect and Related Disorders. Quarterly Journal of Experimental Psychology 46 (3):435-461.
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