Those with this ability can see the memories that cause strong emotions in other people around them. In these memories he/she can see events, names and even the feelings and thoughts of the people involved in that particular event. For this power to work, he/she must be conversing with the person.
Todd Barstow is a "4400" who disappeared August 29, 1995. He told Alana Mareva the whereabouts of the man who killed her husband and son in a car accident.