Binaural Beats

When two tones of slightly different frequencies play — one in each ear — the brain perceives something that isn’t physically there: a third tone, pulsing at the difference between the two. That perceived pulse is called a binaural beat.

If you hear 432 Hz in your left ear and 440 Hz in your right, your brain constructs an 8 Hz beat. Not a sound you’d pick up with a microphone. Something your mind creates from the gap between two real tones.

How the brain creates a binaural beat

A structure in the brain stem called the superior olivary complex is the first processing centre to receive input from both ears at the same time. When it detects two tones that are close in frequency, it registers the difference — and that difference becomes what you perceive as the beat.

This sets off a process called entrainment: the brain’s electrical activity tends to follow the rhythm it detects, gradually synchronising toward that frequency. Researchers call this the frequency-following response. It’s the same underlying principle that makes live sound healing work — though through a very different mechanism. I’ll come back to that.

Before you try them — headphones are essential

This is the most important thing to know: binaural beats only work through headphones. Each tone needs to arrive separately — one to each ear. If you play a binaural beat recording through speakers, the two frequencies mix in the air before they reach you, and the effect disappears entirely. What you’d hear at that point would be a monaural beat (or just two notes played together) — not a binaural one.

That distinction matters more than it might seem, and it shapes a lot of how I think about recorded sound versus live sound healing.

The alpha state

At 8 Hz, binaural beats sit in the alpha brainwave range — a brain wave frequency most people associate with that quiet, open space between alert and drowsy. Not asleep. Not sharply focused. Somewhere in between, where the mind settles without switching off.

In the alpha state, most people notice a few things:

• A quieting of mental chatter — thoughts slow, and stop competing for attention
• Physical ease — as if the body has remembered how to let go of the tension it’s been holding
• A gentle lift in mood — not euphoria, but a kind of steady, calm positivity
• Openness to creative thought — that “aha” feeling that arrives when you stop forcing an answer

These effects aren’t guaranteed — individual responses to binaural beats vary considerably, and the research is still developing. But alpha entrainment is among the most studied areas in brainwave science, and the general pattern holds across a wide range of people.

Binaural beats and live sound healing — the difference

When I play my crystal bowls in a session, something similar is happening — but the mechanism is entirely different.

The bowls create monaural beats: two real frequencies meeting in the same physical space, interfering with each other at the acoustic level. The beat isn’t constructed by your brain — it exists in the air. You don’t just hear it. You feel it move through your body, your chest, the floor beneath you. And because it’s physically present in the room, it reaches everyone lying there at the same time.

Binaural beats are intimate and individual — a solo experience, constructed by your own nervous system, delivered through headphones. A live sound bath is communal and felt. Both can guide the brain toward the same alpha frequency. But they are quite different experiences, and I’d encourage you to try both.

If you’d like to read more about how monaural beats work in a live session, I’ve written about it here: Monaural Beats →

Hear a binaural beat for yourself

If you’d like to know what one actually sounds like, the team at myNoise have built a beautiful free generator that lets you explore the full range of binaural frequencies. The 8 Hz Alpha preset is a good starting point — it’s relaxed, simple, and close to the frequency range I work with in my sessions.

Try the myNoise Binaural Beat Generator →
(Select “8 Hz • Alpha | Relaxed” — and put your headphones in first.)

If you’re curious what a live sound bath feels like by comparison — no headphones, no screen, just resonance in a warm room — you’re welcome to come and find out.

What to expect during a sound bath →