Split

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Splitting is the process of the brain forming new headmates through external stress, usually breaking up an existing headmate into multiple (although the origins of some splits may be unknown). Anything can cause a split — violence, school stress, intrapersonal drama, abuse, flashbacks, etc. — and splits can cause one, two, five, or ten headmates from one event. A "split" may refer to the new headmate themself too.

Related Terms
Splitting is primarily seen in adaptive and/or traumagenic systems. It's different than walk-ins, because they come from outside of the system, and created headmates (like thoughtforms) are not usually considered splits either.