Instinct (1999)

Genre: Drama
Starring: Anthony Hopkins, Cuba Gooding, Jr., George Dzundza, Donald Sutherland, and Maura Tierney
Tagline: One man's mind is another man's mystery.

Plot: When a noted anthropologist who left society to live in the jungle is imprisoned for murder, it's up to young psychiatrist to get through to him.

http://www.imdb.com/title/tt0128278/
http://en.wikipedia.org/wiki/Instinct_(film)