Abstract

With the discovery that surgical separation of the cerebral hemispheres produces two independent and differently abled cognitive spheres, Gazzaniga, Bogen, and Sperry (1962) launched a revolution in the field of psychology: the study of human laterality. More than thirty-five years later, the scientific progeny of Roger Sperry continue to study split-brain patients in order to solve some of the many mysteries confronting cognitive neuroscience today. Historically, split-brain studies catalyzed research on hemispheric differences in neurologicall y intact subjects. More recently, the bisected brain has served as the proving ground for various models of complex cognitive processes. What lessons have been learned from splitbrain patients? How does research on split-brain patients converge with other methodologies, including the advances in neuroimaging gaining prominence in the field?

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