Understanding the human body is a team effort. That's where the Yachtel group comes in.

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Welcome to Science Quickly, a Scientific American podcast series.

I'm Josh Fishman, Scientific American Senior Health Editor.

Is it possible for one person to have several completely different personalities? I've seen movies and read books that claim that this happens, but is it real?

To answer that question, today I'm joined by psychotherapist and anthropologist Rebecca Lester

from Washington University in St. Louis.

She'll tell us about a patient she worked with for many years, an amazing young

woman with 12 different parts. These parts started out fighting with one another, but eventually and

remarkably they formed a peaceful community, many selves in one body and mind.

This episode of Science Quickly contains discussions of personality disorders,

childhood trauma, and a brief mention of child abuse.

Please listen at your discretion.

Rebecca, who was Ella?

Sure. Well, Ella is, of course, a pseudonym to protect her privacy. At the time she came to see me, she was a 19-year-old college student. She was dealing with symptoms of complex post-traumatic stress disorder. So that included things like flashbacks, nightmares, bodily kinds of difficulties, and she had some disordered eating and self-harm. So she had a lot going on that she was really struggling with this trauma that she had experienced. Where did this

PTSD come from? She was very upfront about that. She endured really horrific abuse as a young child

and was very aware of that, never had forgotten

it. And that was the primary motivator of the PTSD. Yeah. But that wasn't all that was going on

with Ella. You noticed a couple of things after you'd been working with her. You told me.

...