PMID: 9534001Apr 16, 1998Paper

Ipsilateral neglect: reversal of bias or exaggerated cross-over phenomenon?

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
J C AdairK M Heilman

Abstract

When right brain injury produces contralesional neglect (CN), patients typically misbisect lines to the right. However, others demonstrate so-called "ipsilateral neglect" (IN) with misbisection to the left of midpoint. Paradoxically, most patients with CN also demonstrate a 'cross-over' phenomenon whereby they misbisect short lines to the left. It is not known whether patients with IN actually have a contralesional bias opposite the ipsilesional bias observed with CN, or if their performance reflects an exaggerated cross-over. These alternatives can be distinguished by power function analysis which evaluates the relationship between magnitude of perception and stimulus magnitude. Using line bisection tasks to derive a power function, an IN patient showed a reduced exponent (beta = 0.841), falling outside 95% confidence intervals (CI) for controls but within the CI for CN patients. The IN patient showed a greatly increased constant (K = 7.82), extending outside the CI for both controls and CN patients. The results suggest that the anomalous leftward misbisection with IN is associated with an exaggerated cross-over point and not simply reversal of spatial bias.

Citations

Sep 27, 2006·Neurocase·Valeria DragoKenneth M Heilman
Jul 3, 2013·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Kwang-Dong ChoiEun-Joo Kim
Jun 28, 2000·Neuropsychologia·A ChatterjeeJ Calhoun
Aug 31, 2001·Neuropsychologia·R Ricci, A Chatterjee
Nov 4, 2000·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·D L NaK M Heilman
Jul 21, 2004·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Dario GrossiLuigi Trojano
Jun 16, 2015·Journal of the International Neuropsychological Society : JINS·Glen R FinneyKenneth M Heilman
Nov 9, 2005·Brain Research. Cognitive Brain Research·Robert D McIntoshA David Milner

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