How EMDR works is still being discovered, and the proposed mechanisms are not mutually exclusive.

EMDR Eye Movement Desensitization and Reprocessing: a trauma therapy in which the patient recalls a memory while moving their eyes from side to side. Recommended as a first-line PTSD treatment; whether the eye movements themselves do anything is still argued about.

Psychotherapy Treatment by conversation between a therapist and a patient, and the arguments about what in it actually does the work.

Trauma What overwhelming experience leaves behind, and whether it is stored in the body, the memory, or the loop between them.