EMDR, often a shorter term therapy, was developed to resolve symptoms resulting from disturbing and traumatic life experiences. It is a very specific technique requiring certified training and is particularly used in the treatment of PTSD.
EMDR is thought to imitate the psychological state that we enter when in rapid eye movement (REM) sleep. Studies show that when in REM sleep we are able to make new associations between things very rapidly. EMDR is designed to tap into this high-speed processing mode that we all have, helping the brain to process the unresolved memories and make them less distressing. It has been shown to be very effective.