In the split-brain operation, the is severed, which is the primary communication pathway between the two hemispheres.

Corpus callosum.

Explanation:

Corpus callosum is the nerve bundle connection between the left hemisphere and right hemisphere of the brain. The corpus callosum perform important function like balancing of arousal and tactile localization.

The split brain surgery may be defined as the way of the removal or the treatment of the epilesy from the brain. The corpus callosum is severed during the surgery. The two hemisphere of the brain is not able to exchange the information properly.

Thus, the answer is corpus callosum.

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Explanation:

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