Eye movement desensitization and reprocessing (EMDR) therapy is utilized to treat Post Traumatic Stress Disorder (PTSD). Multiple studies have shown that it can reduce the emotional distress caused from traumatic memories and experiences. EMDR replaces negative emotional reactions to difficult memories with less-charged or positive reactions or beliefs. Performing a series of back and forth, repetitive eye movements for 20-30 seconds is helpful to individuals for the changing of the damaging emotional reactions. Therapists refer to this protocol as “dual stimulation.” During the therapy, an individual stimulates the brain with back and forth eye movements (or specific sequences of tapping or musical tones). Simultaneously, the individual stimulates memories by recalling a traumatic event.