Following a gunshot wound to his head, jack became more uninhibited, irritable, and profane. it is likely that his personality change was the result of injury to his:
a. parietal lobe.
b. temporal lobe.
c. occipital lobe.
d. frontal lobe.
e. endocrine system.

d.Frontal lobe.

Explanation:

Frontal lobe :

This is our brain portion that controls important human mental abilities like the expression of emotion, solving problems, memory, judgment, language, and sexual behavior. Essentially, this is our personality's "control panel" and our ability to interact.

The capacity of a person to make good choices and weigh consequences is often impaired after a frontal lobe injury. Frontal lobe injury can result in increased irritability, which can include a change in attitude and an inability to control behavior.

Total volume of cerebral cortex (human): frontal lobe = 41%; occipital lobe = 18% ; parietal lobe = 19%;temporal lobe = 22%.

Therefore the answer is d.

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