CNN Anderson Cooper 360 March 19, 2013 05:46:00
>> why did you put the camera in the washer? >> i don't have memory of that. i don't know why i would do that. >> reporter: and defense lawyers are hoping this psychologist, a defense witness, will convince jurors arias isn't faking this. >> it appears as if she suffers from dissociative amnesia. >> reporter: the doctor says that is something that happens after severe trauma such as a killing. the acute stress that follows sends a surge of chemicals to the brain that block the brain from storing any memories. >> the more intense the crime or intense the distress, the more complete the amnesia ...