The concept of parts work is rooted in various theories (Theory of Structural Dissociation, Internal Family Systems (IFS), and Ego State Therapy) to explain the knee-jerk reactions that ventilate emotions that are “stuck” in trauma time. As Sarah Jenkins LPC has written, “Often, we “reject” our emotions, or other aspects of the traumas, because it feels too risky or too dangerous to fully realize them at the time of the experiences.” Please continue reading here for further information on the Theory of Structural Dissociation and how it can be explained by the Pixar movie, Inside Out.