Why Can Some People Recall Every Day Of Their Lives? Brain Scans Offer Clues : Shots - Health Blog : NPR

People with extraordinary autobiographical memories also tend to have obsessive tendencies, researchers are learning. Brain scans reveal structural differences in the brains of these people, including a larger-than-normal caudate, a brain area linked to OCD.

http://www.npr.org/blogs/health/2012/08/20/158779474/why-can-some-people-recall-every-day-of-their-lives-brain-scans-offer-clues