No one knows how any form of psychotherapy works neurobiologically or in the brain. However, we do know that when a person is very upset, their brain cannot process information as it does ordinarily. One moment becomes "frozen in time," and remembering a trauma may feel as bad as going through it the first time because the images, sounds, smells, and feelings haven’t changed. Such memories have a lasting negative effect that interferes with the way a person sees the world and the way they relate to other people.
EMDR and/or Brainspotting seem to have a direct effect on the way that the brain processes information.
Normal information processing is resumed, so following a successful EMDR/Brainspotting session, a person no longer relives the images, sounds, and feelings when the event is brought to mind. You still remember what happened, but it is less upsetting. Many types of therapy have similar goals. However, EMDR/Brainspotting appears to be similar to what occurs naturally during dreaming or REM (rapid eye movement) sleep when bi-lateral stimulation through eye movement, sound or sensation is produced. Therefore, EMDR/Brainspotting can be thought of as a physiologically based therapy that helps a person see disturbing material in a new and less distressing way.
*Information taken from www.emdria.org. For more information please go to www.emdria.org