yes this is a therapy technique used with people with DID. short version it's a way to access trauma memories while remaining grounded (non dissociated) at the same time. its done over the course of short classes called phases. each phase is done for only a few sessions. the first part is where you and the therapist just talk about non triggering things like just like you would any other therapist where a therapist asks you about your history of mental problems, what you want to accomplish, setting goals and the therapist assesses / decides whether you are ready to begin working together, how open and willing you are to work on your trauma issues. the next part is making sure you know how to use grounding tools like breathing, relaxation, visualizations/imagery/... then in the third part of this you pick a trauma memory then while using the tools to remain grounded you and the therapist talk about that trauma memory. in this part sometimes people are asked to do something physical like a repeating movements with your eyes and hands or hold a stimulating object that either vibrates or lights up. this goes on for about 3-6 sessions then you have the closure session where you are asked to keep a daily journal for a week, then for the last session you report back to the therapist on how that week went. and thats the end of the process.

by the end of the process you no longer get triggered by that memory and you know how to remain grounded / non dissociated when encountering a trigger.