Interhemispheric neural summation in the split brain with symmetrical and asymmetrical displays

Neuropsychologia
Matthew Roser, M C Corballis

Abstract

The present study, investigates interhemispheric integration in the split brain. Four split-brained, two acallosal and 14 normal subjects carried out a simple reaction time task in which they responded to stimuli presented either singly in the left visual field, singly in the right visual field, or simultaneously in both visual fields. Stimuli were white against a black background and bilateral stimuli were either symmetrical or asymmetrical around the central vertical meridian. For unilateral stimuli, the difference in response time (RT) between crossed and uncrossed hand-field combinations (crossed-uncrossed difference, or CUD) measured interhemispheric transfer time. RTs to bilateral and unilateral stimulus displays were compared to provide a measure of redundancy gain (RG). Normal subjects exhibited small CUDs and RGs. Split-brained and acallosal subjects were found to have much longer CUDs, and to show enhanced RGs which could not be explained by a probability (race) model, implying subcortical neural summation. This summation did not depend on the preservation of symmetry, suggesting that it may not occur at the retinotopically organized superior colliculus, but at another site such as the pons or reticular formation.

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Citations

Nov 9, 2007·Experimental Brain Research·Silvia Savazzi, Carlo A Marzi
Feb 12, 2008·Experimental Brain Research·N RidgwayA Sahraie
Jul 17, 2013·Experimental Brain Research·Vincenzo FlorioCarlo A Marzi
Apr 23, 2010·Neuropsychology Review·Tilman Schulte, Eva M Müller-Oehring
Mar 13, 2003·Neuropsychologia·Matthew Roser, Michael C Corballis
Nov 15, 2003·Neuropsychologia·Michael C CorballisMara Fabri
Jul 11, 2006·Journal of Experimental Psychology. Human Perception and Performance·Wolf Schwarz
Jun 14, 2003·Neuropsychology·Melodie S Barr, Michael C Corballis
Dec 15, 2005·Neuropsychology·Melodie S BarrMichael C Corballis
Dec 24, 2002·Journal of Cognitive Neuroscience·Michael C CorballisPaul M Corballis
Sep 2, 2005·Perception & Psychophysics·Matthias GondanBrigitte Röder
Mar 16, 2013·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Giovanni Berlucchi
Dec 24, 2005·Experimental Brain Research·Marco TamiettoGiuliano Geminiani
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May 19, 2009·Brain and Cognition·Samuel DesjardinsCarl Roberge
Jul 9, 2008·Neuropsychologia·Vincenzo FlorioSilvia Savazzi
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Sep 13, 2005·Brain Research. Cognitive Brain Research·Michael C CorballisTullio Manzoni
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Dec 6, 2017·Laterality·Jacques PrieurCatherine Blois-Heulin

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