Mixed Part

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Mixed Parts (MPs) are headmates that cannot be defined as ANPs or EPs but instead a combination of both. MPs may lean more heavily towards either ANP or EP, and systems with MPs may still have headmates that fit neatly into the dichotomy of ANP and EP.

Examples of MPs include
 * trauma holders who are mature and rational, and may have full access to the memories surrounding their trauma
 * "neutral" headmates that struggle with intense emotions and PTSD symptoms and have some awareness of trauma, usually accompanied by emotional amnesia

Some associate MPs with trauma that bled over into daily life and therefore prevented a clear distinction between ANPs and EPs.

Many systems rebuke this label for any number of reasons (including the "parts" terminology), and it should only be used for the purposes of self-identification, not the classification of others.

History
ANP, EP, and other ideas of Structural Dissociation come from Charles Samual Myers, a psychologist who worked with soldiers during World War One. He put the "shell shock" (now PTSD) into the scientific lexicon in the early 1900s and described it in the context of dissociation. Later, researchers Ellert Nijenhuis, Onno van der Hart, & Kathy Steele proposed the theory of Structural Dissociation in 2004 by incorporating Myers' terminology into more modern understandings of dissociation and child development.

Related Terms
Apparently Normal Parts are defined by their ability to appear "normal" to the outerworld, with avoidance of any reminders of trauma.

Emotional Parts are defined by their trauma responses, and are usually described somewhat as trauma holders.