EPPP Psychology

Category - Biological Bases of Behavior

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Severe, treatment-resistant epilepsy is sometimes treated with surgery resulting in split-brain. Which part of the brain is surgically altered?

The frontal lobes
The corpus callosum
The hypothalamus
The left hemisphere

Explanation

Answer: B - Split-brain results from severing the corpus callosum, which connects the right and left hemispheres. Following this surgery, the two hemispheres can no longer communicate. A classic study of split-brain patients flashed the letters “HE” in the left visual field and the letters “ART” in the right visual field. Patients were able to verbalize “ART” since it registered in the left hemisphere, but could not verbalize the word (HEART).

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