The influence of viewing eye on pseudoneglect magnitude

Journal of the International Neuropsychological Society : JINS
Mark E McCourtJ Butler

Abstract

Various factors influence the degree of leftward error (pseudoneglect) that typifies the performance of normal individuals in line bisection tasks. This experiment reveals that the eye through which stimuli are viewed also exerts a modulating influence on spatial attention, as indexed by significant alterations in the magnitude of pseudoneglect. Using a forced-choice tachistoscopic line bisection protocol, 24 participants (12 male; 12 female) bisected horizontally oriented lines (22.6 degrees w x 0.39 degrees h) presented to central vision in 3 conditions: left uniocular viewing (L), right uniocular viewing (R), and binocular viewing (B). Perceived line midpoint, a measure of bisection accuracy, deviated significantly leftward of veridical (p < .05) in all viewing conditions, confirming a tonic asymmetry of visuospatial attention in normal young observers. In addition, a significant influence of viewing condition was found (p < .05) where pseudoneglect was greatest in the L condition, followed by the B and R conditions, respectively. Analysis of the slopes of the psychometric functions revealed significantly greater bisection precision in the binocular versus uniocular viewing conditions (p < .05). The results are interpreted t...Continue Reading

Citations

Dec 15, 2007·Journal of the International Neuropsychological Society : JINS·Alejandra M AmengualKenneth M Heilman
Dec 10, 2015·Experimental Brain Research·Ancrêt SzpakMichael E R Nicholls
Jun 23, 2010·Brain and Cognition·Yamaya SosaMark E McCourt
Dec 23, 2008·Neuropsychologia·Peii ChenAnna M Barrett
Jun 5, 2004·Archives of Physical Medicine and Rehabilitation·Anna M BarrettKenneth M Heilman
May 17, 2006·Neuropsychologia·Janet H Bultitude, Anne M Aimola Davies
Jun 21, 2005·Brain and Cognition·Rachel M PowersKenneth M Heilman
Feb 13, 2001·Brain and Cognition·M E McCourtM Chaussee
Mar 31, 2011·Vision Research·Yamaya SosaMark E McCourt
Apr 4, 2007·Perception·I Christopher McManus, Peter Thomas

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