Frequently asked questions

Bilateral stimulation (BLS) is the rhythmic left–right sensory input used during EMDR therapy — visual, auditory or tactile — to support processing of distressing memories.

EMDR (Eye Movement Desensitization and Reprocessing) is an evidence-based eight-phase psychotherapy for trauma, developed by Francine Shapiro and recommended for PTSD by the WHO, APA and NICE.

The leading explanation is working-memory theory: performing a dual attention task while recalling a distressing memory taxes working memory and reduces the vividness and emotionality of that memory.

Alternating stereo audio provides the dual-attention task without requiring the client to track a visual target. It is useful when eye tracking is fatiguing or when the client prefers to close their eyes.

Seven patterns: horizontal, vertical, diagonal, circular, infinity (figure-eight), pendulum and smooth random. Speed, size and audio pan depth are independently adjustable.

Yes. Online EMDR uses the same eight-phase protocol; only BLS delivery is adapted for video. Published outcomes are broadly comparable to in-person work when protocol fidelity is maintained.

Peer-reviewed studies and case series report outcomes for online EMDR broadly comparable to in-person EMDR when protocol fidelity is preserved and client selection is appropriate.

Yes. Visual and auditory BLS render on the client's own device through a browser tab, synchronised to the therapist's controls in real time.

Browser-based EMDR is online EMDR delivered entirely through a web browser — no downloads, no client accounts and no operating-system lock-in.

A modern browser, a stable internet connection, a video platform (Zoom, Teams, Doxy.me, Google Meet or SimplePractice), and a browser-based BLS tool. Headphones on the client side are recommended when using auditory BLS.

The therapist runs the session on a video platform and delivers bilateral stimulation through a browser-based tool the client opens on their own device. The eight-phase protocol is preserved.

No. Clients open a link in any modern browser — desktop, tablet or phone. No app, no account, no download.

Yes. BilateralSync runs in a browser tab alongside any video platform: Zoom, Microsoft Teams, Doxy.me, Google Meet, SimplePractice and others.

Sub-100 ms between therapist controls and the client display. Changes to speed, pattern or audio are visible/audible essentially instantly.

Yes. Visual and stereo-panned auditory BLS run in perfect sync.

Yes. No client PII is collected, sessions use unguessable codes, analytics is cookieless and anonymous. A DPA is available for clinics on request.

Yes. Free includes 1 session per calendar month with all 7 bilateral stimulation patterns, stereo audio and the full client view. It does not include unlimited sessions, saved presets or session history.