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Interhemispheric Stroop effects in partial and complete agenesis of the corpus callosum

Published online by Cambridge University Press:  05 March 2001

WARREN S. BROWN ,
ELLEN D. THRASHER  and
LYNN K. PAUL
WARREN S. BROWN
Affiliation:
The Travis Institute for Biopsychosocial Research, Fuller Graduate School of Psychology, Pasadena, California Department of Psychiatry and Biobehavioral Sciences, and Brain Research Institute, University of California, Los Angeles, California
ELLEN D. THRASHER
Affiliation:
The Travis Institute for Biopsychosocial Research, Fuller Graduate School of Psychology, Pasadena, California
LYNN K. PAUL
Affiliation:
The Travis Institute for Biopsychosocial Research, Fuller Graduate School of Psychology, Pasadena, California
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Abstract

Previous research had demonstrated diminished interhemispheric Stroop effects in individuals with agenesis of the corpus callosum (ACC), suggesting an important role for the callosum in interhemispheric color-word and color-patch interactions. However, this outcome rested on the results of only 1 ACC participant, who had normal intelligence and a minimum of other neuropathology. In the research reported herein, the role of the corpus callosum in interhemispheric Stroop interference and facilitation was investigated in 9 individuals with complete or partial ACC and normal intelligence, and in non-ACC controls. Congruent, incongruent, or neutral stimulus pairs were presented either unilaterally (color-patch and color-word in the same visual field) or bilaterally (color-patch and color-word in different visual fields). Both unilateral and bilateral (interhemispheric) Stroop interference were found for both ACC and non-ACC groups, with no significant difference in magnitude, indicating that extracallosal pathways are sufficient for mediating this phenomenon. It is suggested that the anterior commissure is a more likely candidate for the interhemispheric transmission of the semantic information resulting in Stroop interference. (JINS, 2001, 7, 302–311.)

Keywords

Stroop interferenceAgenesis of the corpus callosumInterhemispheric interactionsAnterior commissure
Type
Research Article
Information
Journal of the International Neuropsychological Society , Volume 7 , Issue 3 , March 2001 , pp. 302 - 311
Copyright
© 2001 The International Neuropsychological Society

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