Regression

Regression therapy focuses very specifically on past events and how they influence the way we behave in the present day. This is particularly relevant to those trying to overcome childhood abuse. Still, it can also apply to people who were subject to any abuse in relationships in the past.

This type of therapy involves hypnosis, which psychotherapists and hypnotherapists alike have researched. The need for hypnosis typically surrounds the fact that many practitioners believe that the subconscious mind can repress trauma if it was inflicted at an age before the mind could figure out how to process it. So the practitioners are typically trying to drum up memories through hypnosis.

Source: https://www.verywellmind.com/what-is-regression-therapy-5194495