Hemispheric integration and differences in perception of a line-motion illusion in the divided brain

Neuropsychologia
M C CorballisPaul M Corballis

Abstract

Five people lacking the corpus callosum (two callosotomized, three with agenesis of the corpus callosum) and neurologically normal subjects were shown vertical lines that appeared instantaneously between pairs of rectangles in one or other visual field. When one of the rectangles flashed prior to the presentation of the line, and the line was in the same visual field, all subjects perceived the line as spreading from the flashed rectangle to the other. Normal subjects and one of the callosotomized subjects showed a slight but significant right visual-field advantage, perhaps reflecting a left-hemispheric superiority in processing rapid temporal events. The illusion was also induced when the line and the flash were in opposite visual fields in one of the callosotomized, one of the acallosal subjects, and about half of the normal subjects, implying interhemispheric integration even in the absence of the corpus callosum.

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Citations

Nov 11, 2003·Brain and Cognition·Paul M Corballis
Apr 19, 2006·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·P VolpeM Gentile
Feb 3, 2009·Prenatal Diagnosis·P VolpeG Rembouskos
Feb 16, 2006·Brain Research·Behrad NoudoostHossein Esteky
Dec 19, 2009·Neuropsychologia·Eva M Müller-OehringEdith V Sullivan
Dec 9, 2009·Neuropsychologia·Arwen Markwick, Michael C Corballis
Oct 13, 2009·Perception·Charles A CollinJulie-Anne Séguin

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