Zack is likely to have suffered damage to the "frontal lobe" of his cortex.
The frontal lobe is the piece of the cerebrum that controls vital psychological abilities in people, for example, emotional articulation, critical thinking, memory, dialect, judgment, and sexual conduct etc. It is, in simple words, the "control board" of our identity and our capacity to express ourselves. Hurting this could change the personality as in this case can be seen.
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Answer :

Answer:

Frontal lobe and limbic system

Explanation:

Beyond the damage of Zack's frontal lobe itself, subsequent investigations could be seen to be possible that there has been a damage to pathways between the frontal lobe and other brain structures, including the limbic system. With connections between the planning functions of the frontal lobe and the emotional processes of the limbic system severed, Zack had difficulty controlling his emotional impulses.

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