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Crossover is not a consequence of neglect: A test of the orientation/estimation hypothesis

Published online by Cambridge University Press:  11 January 2002

MARK MENNEMEIER ,
ELSIE VEZEY ,
MELISSA LAMAR,  and
GEORGE JEWELL
MARK MENNEMEIER
Affiliation:
Department of Physical Medicine and Rehabilitation, University of Alabama, Birmingham, Alabama
ELSIE VEZEY
Affiliation:
Department of Psychology, University of Arizona, Tucson
MELISSA LAMAR,
Affiliation:
National Institute on Aging, Baltimore, Maryland
GEORGE JEWELL
Affiliation:
Department of Psychology, University of Alabama, Birmingham, Alabama
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Abstract

Most patients with neglect demonstrate a crossover effect on line bisection. Crossover refers to a pattern of performance in which long lines (>10 cm) are bisected ipsilateral to brain injury and short lines (<2 cm) are bisected contralateral to brain injury. Crossover bisections on short lines are of interest because they are not predicted by contemporary theories concerning neglect. However, we propose that the effect depends on two independent factors that normally influence bisection performance but are merely exaggerated in neglect—a tendency to overestimate the length of short lines and underestimate long lines and a tendency to orient attention preferentially in one spatial direction. We predicted that both patients with unilateral left and right hemisphere injury would demonstrate crossover on line bisection and that they would overestimate short lines and underestimate long lines upon direct visual inspection. Further, the 2 groups were predicted to demonstrate crossover in opposite directions owing to different lesion-induced biases in attentional orientation. Testing 5 patients with right hemisphere injury and 7 patients with left hemisphere injury confirmed each prediction. Additionally, errors in length estimation were exaggerated among patients with right hemisphere injury, most of whom had neglect. It is concluded that while crossover is accentuated in cases of neglect, it is not a consequence of neglect per se. As such, crossover bisections are not at odds with contemporary neglect theory. (JINS, 2002, 8, 107–114.)

Keywords

NeglectOrientationMagnitude estimationLine bisectionAttentionConfabulation
Type
Research Article
Information
Journal of the International Neuropsychological Society , Volume 8 , Issue 1 , January 2002 , pp. 107 - 114
Copyright
© 2002 The International Neuropsychological Society

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