I think the brain is a dynamic system in which some parts control or suppress other parts. And if perhaps one has damage in one of the controlling or suppressing areas, then you may have the emergence or eruption of something, whether it is a seizure, a criminal trait - - or even a sudden musical passion.
Oliver SacksIt is easy to recollect the good things of life, the times when one's heart rejoices and expands, when everything is enfolded in kindness and love; it is easy to recollect the fineness of life-how noble one was, how generous one felt, what courage one showed in the face of adversity.
Oliver Sacks