Concussions, a type of traumatic brain injury, generally occur when the head either spins rapidly or accelerates quickly and then stops - like when a player tackles another player on the field. The National Football League and Congress have both held hearings on the head injuries, which can cause memory loss, confusion, nausea, blurred vision and long-term neurological effects, including symptoms of dementia, headaches and concentration problems.

A) What part of the brain would be damaged if the football player's symptoms were primarily problems with memory?

B) If after repeated blows to the head a football player has difficulty with making good judgments and decisions, and the personality changes, which part of the brain has been damaged?