Is it possible to have a split personality without either knowing of the other personality's existence?

Question

Is it possible to have a split personality without either knowing of the other personality's existence?

Answer 1

The term "split personality" is misleading.  The disorder is actually called Multiple Personality Disorder.  It would be possible for some of the personalities not to realize the others existed.

MPD is usually the result of severe childhood trauma, most likely involving sexual abuse.  The abused child forms another "person" because they cannot deal with what is happening to them.  One symptom that there might exist another personality in this case would be periods of time that the person has no memory of.

Not all psychologists or psychiatrists believe the MPD exists and it remains a controversial diagnosis.

Answer 2

well usually split personalities are created to protect the host or actual person from any more physical or mental pain so the alternate usually know about the host whereas the host doesnt know about the alternate. when it comes to both not knowing about eachother, i believe could be possible, not probable, but possible.