EMDR Treatment is based on the theory of adaptive information processing (AIP), which posits that traumatic events are not properly processed in the brain when they happen and that the memories of them are stored differently than normal ones, which is why they can continue to affect you long after the trauma has passed.
Memories of normal events are stored and networked in a way that connects and integrates them with related emotions and other retained information to help you make sense of your experience. Traumatic events, on the other hand, do not get networked correctly and are stored in a dysfunctional, often fragmented way, separated from other memories rather than merged with them.
Because of this disconnect, sights, sounds, and smells that bear any perceived connection or similarity to the original trauma trigger the improperly stored memories and the mind accesses them in a distorted, overpowering way that elicits all the same emotions and physical sensations as the original experience did. The past becomes the present, and the memory of it is reinforced as you continue to relive the event repeatedly.
The goal of EMDR treatment
The goal of EMDR treatment is to help you reprocess the improperly stored traumatic memories so you can heal from their effects. Using bilateral stimulation, your brain is enabled to create new connections, unblock the fragmented memories, and integrate them into its larger memory bank, thus reducing their vividness and decreasing the intensity of the emotions associated with them.