AOL.com Video - You've Got Oliver Sacks

VIDEO:Entertainment

You've Got Oliver Sacks

Description:Neurologist Oliver Sacks discusses the complex phenomenon of hallucinations in the human brain. Though it sounds frightening and maybe a bit hard to believe, Dr. Sacks explains that over half of mourners often gain the ability to see or feel their dead loved ones. Far from scary, he says it's a very common condition. (1:37)

Source: You've Got

Tags: youve got , bereavement hallucinations , ghosts , hallucinations