After a head injury, 15-year-old jack started having temper tantrums. most likely his was injured

I believe the answer your looking for is the "frontal" lobe, though this is if you just want the lobe of the brain. The frontal lobe is responsible for giving the traits that define our personality and who we are are. If you want to be specific though it is, I think the "Amydalga" is the more specific answer

Make a decision because you before you make a decision you have to know what it’s about and do reasearch