had to be sliced open to get an inside view. reporter: so you lose something by taking it apart? you do. this technology called clarity is a way to see through the brain without taking it apart. reporter: with the brian fully intact scientists can study it more thoroughly. to look inside the brain like this and look at all those various pathways that we ve speculated on for years to see them actually come to life, it s it s fascinating. reporter: the process involving submerging a whole in tact brain into a solution called hydro gel that makes it easier to extract lipids or fats. by getting the unprecedented view of the human brain the doctor and his team hope it will lead to an unprecedented understanding of diseases like al timers and parkinsons.