Answer:
Neuropsychology
Explanation:
Neuropsychology is the field of study in which the activities of the brain and how these activities influence a person's behavior is studied. And, also, the effect of injuries and brain damages on a person's behavior is studied.
A person who studies the relationship between the brain and behavior is a neuropsychologist. He is a specialist who studies our complex brain system. And they focus on studying the cognitive function and behavior of a person whose brain is damaged or injured.
So, the correct answer is Neuropsychology.