If your corpus collosum were severed, could your right postcentral gyrus know what your left hand was doing ? why or why not

No.

This is because your corpus collosum is the brand of nerve fibers that join the two hemisphere of your brain, if it was severed, your post central gyrus would not know what your left hand was doing because the corpus collosum is part of the connection that helps your brain register the information.

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