In psychiatry:

“Dissociation is a disconnection between a person’s thoughts, memories, feelings, actions or sense of who he or she is. This is a normal process that everyone has experienced. Examples of mild, common dissociation include daydreaming, highway hypnosis or “getting lost” in a book or movie, all of which involve “losing touch” with awareness of one’s immediate surroundings.”

“Dissociation is a natural response to overwhelming experiences and sensations. Dissociation is a way our mind protects itself from complete overwhelm.”

“There is a small group of people who dissociate a lot, usually due to extreme distress and trauma. They can develop separate self-states or parts, which we are calling dissociative identities.”

“The phenomena of pathological dissociation are recurrent, jarring, involuntary intrusions into executive functioning and sense of self.

Paul F. Dell, PHD.

See also: Dissociative Identities