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A 'split-brain' individual is a person whose corpus callosum has been surgically severed, halting direct neural communication between the right and left hemispheres. This procedure is sometimes performed as an effective treatment for severe epilepsy to control the spread of seizures. Following the surgery, the lack of interhemispheric connection leads to unique behaviors and reveals the specialized capabilities of each hemisphere.

Split-Brain Individual

An example of split-brain behavior occurs when a picture is presented exclusively to a patient's left visual field, sending the information solely to the largely nonverbal right hemisphere. Consequently, the patient is unable to verbally name the object. However, they can recreate the picture using their left hand, which is also controlled by the right hemisphere. When the more verbal left hemisphere sees the picture that the hand drew, the patient is then able to name it, demonstrating how the hemispheres communicate via external actions.

Naming an Object via External Cues in Split-Brain Patients

A patient whose brain hemispheres have been surgically separated is asked to stare at a dot in the middle of a screen. A picture of a key is briefly flashed to the patient's left visual field. What is the most likely outcome when the patient is asked to respond?

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