A patient with left hemisphere dominance underwent a complete cerebral commissurotomy. During a study the patient...

A patient with left hemisphere dominance underwent a complete cerebral commissurotomy. During a study the patient was fitted with special contact lenses so that light would only be seen from the left visual field. The patient was briefly shown a picture of a watermelon. The patient was then asked what they saw in the picture. Finally, the patient was shown several objects including a watermelon and other fruit and was prompted to point to the object they saw previously in the picture. How will the patient respond on these tasks?

Group of answer choices

They will be able to describe what they saw but they will not be able to accurately point with their dominant hand

They will be able to describe what they saw but they will not be able to accurately point with their nondominant hand

They will not be able to describe what they saw but they will be able to accurately point with their dominant hand

They will not be able to describe what they saw but they will be able to accurately point with their nondominant hand

Expert Solution

Answer: They will not able to describe what they saw but they will be able to accurately point with there non dominant hand.

Explanation:Complete cerebral commissurotomy is also known as split brain. It is a surgical procedure which splits the right and left hemisphere of brain. Corpus callosum is the structure which joins both right and left hemisphere. In this surgery opening of corpus callosum occurs so the communication between the right and left hemisphere is lost.

In this question the person is left hemisphere dominant so the person is right handed because the left hemisphere control the right half of the body. If the person see the watermelon in his left visual field the patient will not able to describe because the left visual field process the information and send it to the right hemisphere of brain. The major speech centers are located in the left hemisphere so they will not able to describe. Due to the lack of communication between right and left hemisphere they will not able to describe.

The person will able to point the water melon using the non dominant hand because the right motor cortex of right hemisphere controls the movement of left side of the body. The information seen in the left visual field is send to the right hemisphere so it controls the movement in left half of the body. So using his left hand (non dominant hand) to point the watermelon.

Sydney Mullin answered 1 year ago

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