>> larry: we're back with our panel, dr. drew pinsky, cara santa maria, dr. amen, brain imaging specialist and psychologist dr. george pratt. what did you make of that study they're doing about that obesity study? >> i think it's very interesting and psychiatrist and neurosurgeons are starting to work together again and planting these electrodes in the brain using imaging for things like resistant depression, obsessive compulsive disorder and morbidly obese. it's exciting and going to be much better than the psycho surgery, in the 1940s and '50s. >> larry: what do you think of it, cara? >> i think it's really interesting. and i think where probably the research is limited is the problem of knowing why certain people eat, or certain people