Alternating Bilateral Stimulation (ABS) is used in conjunction with several psychotherapeutic protocols such as DNMS, EMDR and others. ABS provides stimulation to alternating sides of the body, thereby activating alternate hemispheres of the brain. This is believed to aid in the therapy process. Stimulation can consist of moving the eyes back and forth – guided by a moving hand or lights, stereophonic tones alternating from one ear to the other, or tactile stimulation (touching) alternating sides of the body, by manual tapping or tapping devices.