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Abstract
This research investigated the efficacy of brainwave (audio) entrainment by means of isochronic tones in the Schumann resonance frequency (7.83 Hz), to better understand if their use might mitigate or eliminate symptoms associated with Generalized Anxiety Disorder (GAD). Entrainment is the rhythmic matching of neurons, or oscillators, with an external stimulus and is found throughout nature (Granada & Herzel, 2009). In the United States anxiety disorders are the most common mental illness, with more than 6.8 million adults experiencing symptoms of GAD. When combined, all types of anxiety disorder affect some 40 million adults, or 18% of the population (National Institute of Mental Health, 2014). Audio entrainment as isochronic tones is an effective, low cost treatment with apparently few to no side effects that requires no special training or expertise and can be used whenever and wherever needed.
Twenty participants listened to masked isochronic tones in the Schumann resonance frequency during the 15-day single-group interrupted time-series trial (Creswell, 2009). Data was collected before and after the intervention using the State-Trait Anxiety Inventory (STAI), Beck Anxiety Inventory (BAI), and Perceived Stress Scale (PSS) assessments. Participants also completed a daily log and end-of-study questionnaire.
Baseline and post-study data from the STAI, BAI, and PSS were assessed using a combination of descriptive statistics and the Wilcoxon Signed Rank test. Results indicated significantly improved scores post-treatment on all three measures. Daily log responses were subjected to descriptive statistics, which suggested that both anxiety and mood were improved post-study. Finally, data suggested that the effects of the isochronic tones tended to last 2-3 hours after the treatment recording had ended.
This research demonstrated that isochronic tones in the Schumann resonance frequency may have a positive influence on anxiety and mood. The nature of isochronic tones as a non- prescription, non-invasive, and non-addictive mind-body approach may render them attractive as either an adjunct or stand-alone treatment for anxiety. To learn of their potential, larger studies in more controlled environments will be needed.
