Description:It's hard to tell how seven year old Tsunami feels about life behind bars at Malaysia's National Zoo, but scientists believe the answer may lie in her eyes. They're testing their theory with technology and painstaking analysis in a study lef by neuroscientist Dr Neil Mennie from the University of Nottingham. "What I'm trying to do here is to see how the orangutans use their vision in conjunction with their everyday actions."(2:33)