I once met a man who believed he had another person, a soul, living inside of him. It brought him comfort—a psychological construct. I didn’t take it literally, but I took it seriously. I once ...

Comorbidity is when a person has more than one health condition at once. Researchers investigating the comorbidity of personality disorders have found people with certain disorders may have other ...

When you think about multiple personalities, what is the first thing that comes to your mind? For many, it is a disturbing picture of a Hollywood film highlighting a deranged and sociopathic murderer.