Question

After suffering a stroke, a patient can see objects anywhere in front of him but pays attention only to objects in his right field of vision. When asked to describe these objects, he has difficulty judging their size and distance. What part of the brain was likely damaged by the stroke?

(A) the left frontal lobe

(B) the right frontal lobe

(C) the right parietal lobe

(D) the corpus callosum

Short answer

(A)The option “the left frontal lobe” isincorrect.

(B)The option “the right frontal lobe” isincorrect.

(C)The option “the right parietal lobe” iscorrect.

(D)The option “the corpus callosum” is incorrect.

Step-by-step solution

Brain

Each brain side comprises four lobes, the left and right frontal lobe and the left and right parietal lobe. The function of the parietal lobe is to process information related to taste, touch, environment. The function of the frontal lobe is the control of voluntary movements.

Explanation of option ‘(A)’

If there is damage to the left frontal lobe, the patient may suffer from weakness, moto nerve problems, and behavioral issues. The frontal lobe can be damaged due to various reasons like stroke, trauma, dementia.

Thus, according to the symptoms, there was no damage to the left frontal lobe.

Therefore, the given option is incorrect.

Explanation of option ‘(B)’

Damage to the right frontal lobe can cause partial or complete paralysis. It may affect movement and cause paralysis on the opposite that is left side of the body. The damage to the right frontal lobe can cause trouble with speech or language.

Thus, according to the given symptoms, there was no damage to the right frontal lobe.

Therefore, the given option is incorrect.

Explanation of option ‘(C)’

If there is damage on the right parietal lobe, the person may have problems like selective visuals; that is, only the things on the right side are visible while all other things are neglected by the body. It can cause difficulty in constructing and describing things.

Thus, according to the symptoms, the stroke may have damaged the right parietal lobe of the patient.

Therefore, the given option is correct.

Explanation of option ‘(D)’

The corpus callosum connects the two cerebral hemispheres of the brain. The damage to the corpus callosum may affect cognitive and physical ability. In a few cases, it may also cause alien hand syndrome.

Thus, according to the symptoms, there was no damage to the corpus callosum.

Therefore, the given option is incorrect.