ADHD is a condition that affects the brain and is characterized by certain patterns of functioning within particular structures in the brain. With the help of extensive research, neuropsychologists have developed a series of tests that assess the functioning of each part of your brain, so we can determine exactly where something is going wrong. These neuropsychological assessment measures involve many questions and tasks that help your psychologist understand your brain's patterns. So, if you have been wondering: “What exactly is the definition of a psychological assessment and what does it entail?” I’m going to break that down for you here.