have you looked a at their brains? >> i have looked at the neuropsychological -- sensory disabilities. blindness, defenseness, paralysis and then later turned to abusing drugs, this was kind of my field of research when i was younger and so i would look more at -- >> larry: you were younger? >> when i was in my undergrad and i would like at the neuropsychological outcomes. i was doing more behavioral testing using their own measures so i wasn't actually technically looking at their brains, but we were trying to make inferences about their brains based on their behavior. >> larry: blindness is caused from the brain? >> blindness is a pretty complicated pathway that's both .