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In any event, I seem to remember from health classes somewhere that information crosses from one side of the brain to the other through the a bundle of connecting nerves. Which is what they shred when a lobotomy is done. Though I cannot recall what that structure was called, nor was I able to find exactly what I was looking for in a quick look on the web.

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You mean the corpus callosum? It's very very unlikely that the corpus callosum would be damaged in a lobotomy because it's centrally located while lobotomies were really more of a 'poke the brain and see what happens' affairs so they tended to deal with exterior parts of the brain.