Dr. Spencer Reid : [voiceover] "Men are not prisoners of fate, but prisoners of their own minds." ~~ Franklin D. Roosevelt
Derek Morgan : He said his parents had been replaced.
Emily Prentiss : He just sounds delusional.
Dr. Spencer Reid : You know, he might have Capgras syndrome. It's a delusional disorder in which one believes that their friends and loved ones have been replaced by imposters.
Derek Morgan : Sort of like Invasion of the Body Snatchers.
Dr. Spencer Reid : It typically involves only one sense, such as sight. Basically, the neural connection between the visual cortex and the emotional center of the brain becomes severed, so that looking at a loved one doesn't elicit the same emotional response one would expect.
Aaron Hotchner : So, you think they're an imposter.
Dr. Spencer Reid : And the interesting thing is that the auditory connection remains intact, so that if they were to hear a loved one speak and not see them, they'd think that they were real.