Bilateral Stimulation Research-backed

Audio Bilateral Stimulation

Alternating left/right stereo tones for auditory BLS. Requires headphones. Adjustable speed, tone, volume.

This is a reference tool, not a replacement for EMDR therapy. EMDR must be delivered by a trained clinician. If you are using these tools outside of therapy and become distressed, stop, ground yourself, and contact a mental health professional.

Before you start

Headphones required — stereo separation is what makes this bilateral.
Not recommended for home use without clinician supervision.

Open in fullscreen

🎧 Headphones required — stereo separation is what makes this bilateral.

Speed (Hz) 1.0 Passes / set 24 Tone (Hz) 440 Volume 30%

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This tool uses motion by design. If that's uncomfortable, consider the butterfly-hug or visual BLS tool instead.

Clinical sources

Shapiro, F. (2018). Eye Movement Desensitization and Reprocessing (EMDR) Therapy: Basic Principles, Protocols, and Procedures, 3rd ed. Guilford Press.

What this is

Alternating left/right stereo tones delivered via the Web Audio API. Used when eye movements are contraindicated or the client prefers auditory BLS.

When to use it

When eye movements are not tolerated (e.g., severely activated clients, photophobia, visual impairment).
As an alternative modality during long desensitization sessions to reduce eye fatigue.

Clinical notes

Uses hard-panned stereo (full left/full right) for clear bilateral separation. Default frequency 440 Hz. Starting the tool requires a user gesture due to browser autoplay policy — clients will see a “Start” button that must be tapped before sound plays.