St. Louis (KSDK) - Sandusky's lawyers laid out the key to their defense Tuesday.
Around 2 p.m. a psychologist told the jury Sandusky has "histrionic personality disorder" which can cause inappropriate sexual behavior and erratic emotions.
Dr. Randi Mozenter, a psychologist on staff at Barnes-Jewish Hospital, joined us live via Google Plus to give us some background on exactly what this is.
Click the video player above to watch the interview.
KSDK