What is bilateral audio and how does it reduce anxiety?

Bilateral audio uses sounds that move from left to right in a slow, rhythmic pattern, alternately activating each hemisphere of the brain. This is based on the same principle as EMDR (Eye Movement Desensitisation and Reprocessing), a therapy recommended by the World Health Organisation for PTSD. Research on bilateral auditory stimulation found that it reduced physiological markers of stress and increased parasympathetic activity.

Do I need headphones for the Unwind feature?

Yes, headphones are recommended for the full bilateral effect. Bilateral stimulation works by playing alternating sounds in each ear, and binaural beats require slightly different frequencies in each ear to create the perceived third tone that encourages relaxation.

What are binaural beats?

Binaural beats occur when two tones of slightly different frequencies are played in separate ears. The brain perceives a third tone at the difference between the two frequencies. A systematic review found evidence for reduced anxiety in clinical populations, with theta-frequency beats (4 to 7 Hz) showing the most consistent effects on relaxation and stress reduction.

Free EMDR Bilateral Audio App for Anxiety | Binaural Beats

Free EMDR-Style Bilateral Audio — Binaural Beats for Anxiety and Stress

A core feature in MoodFire, the free anxiety and wellbeing app for iOS and Android.

Some kinds of stress don’t respond to thinking your way out. The tension sits in your body. Your nervous system stays revved even when there’s nothing obviously wrong. You feel wound up but can’t point to a specific thought causing it.

MoodFire’s Unwind feature is designed for exactly this. Ten calming audio tracks that use EMDR-style bilateral stimulation and binaural beats to gently engage both hemispheres of the brain, helping you process stress and settle into deeper calm.

How Unwind works

Put on headphones and press play. Gentle sounds move from left to right in a slow, rhythmic pattern. This bilateral auditory stimulation alternately activates each hemisphere of the brain while the calming soundscape gives your attention somewhere safe to rest.

Some tracks incorporate binaural beats, where slightly different frequencies are played in each ear, creating a perceived third tone that encourages specific brainwave states associated with relaxation.

The science behind bilateral stimulation

Bilateral stimulation is a core component of Eye Movement Desensitisation and Reprocessing (EMDR), a therapy developed for processing traumatic memories and now widely used for anxiety. The World Health Organisation recommends EMDR as a treatment for PTSD [1], and a comprehensive meta-analysis found it effective for reducing symptoms of anxiety, depression, and subjective distress [2].

While MoodFire’s Unwind feature is not a replacement for clinical EMDR therapy, it draws on the same principle: alternating bilateral stimulation appears to reduce emotional arousal and facilitate a shift from high-alert states to calmer processing [3]. Research on bilateral auditory stimulation specifically found that it reduced physiological markers of stress and increased parasympathetic activity [4].

What binaural beats do

Binaural beats occur when two tones of slightly different frequencies are played in separate ears. The brain perceives a third tone at the difference between the two frequencies. Research suggests that certain binaural beat frequencies can influence brainwave patterns.

A systematic review of binaural beat research found evidence for reduced anxiety in clinical populations, with theta-frequency beats (4–7 Hz) showing the most consistent effects on relaxation and stress reduction [5]. A separate study found that binaural beats in the alpha range (8–13 Hz) were associated with reduced state anxiety and improved mood [6].

When to use Unwind

Before sleep. If your mind won’t settle at night, bilateral audio gives your brain a gentle focus point that doesn’t require active effort. It’s less demanding than meditation and works well as a wind-down routine.

After a stressful event. When your body is still carrying tension from something that happened hours ago, Unwind helps process the residual arousal without requiring you to think through it.

During a break. Ten minutes with headphones and a bilateral audio track can serve as a nervous system reset during a busy day.

Pairs well with

Breathing exercises — start with Breathe to calm your body, then transition into Unwind for deeper relaxation.
Grounding technique — if bilateral audio alone isn’t enough, pair it with Ground’s sensory technique.
Mood tracking — check in before and after using Unwind to track its impact on your mood over time.

Free, private, and headphone-ready

All ten Unwind tracks are completely free with no paywall. MoodFire is available on iOS and Android. Headphones are recommended for the full bilateral effect.