EMDVR: Investigating the Affective Pathways of Bilateral Stimulation

There is growing interest in the application of EMDR therapy for those with psychosis. Despite decades of evidence to support its efficacy in treating PTSD, little is conclusively known about EMDR’s defining feature: Bilateral Stimulation (BLS). A small number previous studies have shown that BLS effects autonomic activity by increasing parasympathetic arousal. This study recruited 64 non-clinical participants to undertake a 4 minute immersive VR experience that simulated audio-verbal hallucinations. Tactile stimulation was induced by EMDR pulsers. The index group (n = 32) received bilateral stimulation (BLS). The control group (n = 32 ) received unliteral stimulation (ULS). Primary outcome measures (Heart Rate and Heart Rate Variability) were recorded using ECG. Secondary outcome measures (self-reported distress, anxiety, valance and arousal) were recorded using questionnaires. Analysis revealed that tactile BLS resulted in increased heart rate variability. Posthoc test showed decreased anxiety, distress and subjective arousal in the BLS group. These findings support the concept that BLS attenuates affective responses to negative stimuli. Furthermore, this effect appears to operate on both a physiological and psychological level.