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Regular split-brain patients still have some remaining connection between the hemispheres, but would it be possible for their hemispheres to fall asleep independent of the other? What about when not just the corpus callosum but also the anterior and posterior commissures are not functioning for interhemispheral communication?

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Fascinating question! Welcome to cogsci.SE. – Nick Stauner Mar 21 '14 at 17:41

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