When I set out to build Mind Focus I started from a well-known principle in neuroscience:

The brain tends to synchronise its activity with external rhythmic stimuli.

If something emits a pulse at a certain frequency, repeatedly and consistently, the brainwave patterns are entrained towards that frequency.

This is known as brainwave synchronisation or brainwave entrainment and has been studied for decades.

Following this principle, isochronic tones are sound pulses that switch on and off at a precise frequency, at a rhythm that the ear processes and that, if maintained long enough, begins to influence the brain’s activation patterns.

Pure auditory and brain physiology, nothing mystical, nothing pseudoscientific.

The history starts earlier than you’d think

It’s been known for a long time that auditory rhythms influence the brain and its waves, but for isochronic tones specifically we have to go back to everyone’s favourite decade (if they didn’t actually live through it, of course): the 80s.

The foundational work on isochronic tones arrived in 1981, when Manns, Miralles and Adrian applied them to patients with bruxism and myofascial pain.

The result was that rhythmic auditory pulses significantly reduced muscle tension and increased mobility.

The brain was listening to the rhythm and, moreover, using it.

How isochronic tones are processed in the brain

Here lies the key difference from binaural beats, their better-known cousins in this field.

Those beats work like this: you put on headphones and your left ear receives a tone of, let’s say, 200 Hz, while the right receives a different one at 215 Hz, for example.

And here’s the key: the brain (not the ear) creates the difference (in this case, 15 Hz) as an auditory illusion.

So the pulse exists in the central nervous system of the listener, but the sound as such doesn’t exist nor is it generated externally.

Isochronic tones, however, work differently.

The pulse in this case is in the sound itself, and the ear (specifically, the peripheral auditory system, the cochlea) processes it directly. In this case the brain doesn’t need to create anything or use any tricks to generate the stimulus, because it already arrives fully formed.

And this has measurable effects.

Schwarz and Taylor (2005) compared the steady-state responses of both types using EEG and found that monaural beats (which share this peripheral mechanism with isochronic tones) consistently produced cortical responses of greater amplitude.

The signal arrives with more force because it doesn’t have to be reconstructed.

On the other hand, Draganova et al. (2008), using high-precision magnetoencephalography, confirmed this: monaural beats at 40 Hz generated significantly greater steady-state responses than binaural beats.

Chaieb et al. (2015) quantified those differences in their review: the amplitude of auditory steady-state responses with monaural stimulation, such as isochronic tones, is approximately five times greater than with binaural beats.

What the most recent studies say

Now, let’s make something clear: research on isochronic tones is more limited than that on binaural beats, but the most recent studies are the most precise.

Dos Anjos et al. published in 2024 a direct comparison with EEG in 28 participants and this is what they found.

The isochronic tone derivatives produced significantly greater changes in brainwave power than the beats.

And something also very interesting with isochronic tones. These changes did not disappear when the session ended, but persisted for several minutes afterwards.

The randomised clinical trial by Aparecido-Kanzler et al. (2023) did something few studies in the field do: to directly measure with EEG whether the tones create what they’re supposed to create, and then see whether that translates into something real for people, or whether the numbers are too weak to make a dent in reality.

Fortunately for us, the answer to both questions was positive.

Daily 20-minute sessions over three weeks confirmed increases in alpha waves in the temporoparietal region, and participants reported improvements in anxiety, stress, depression and sleep quality.

On the other hand, Dimas Ilham et al. (2025) recruited 60 secondary school students in Jakarta. Those who used isochronic tones “improved their concentration significantly and effectively” compared to the control group.

That peak of effectiveness occurred at Gamma frequencies, which are those used in Mind Focus’s Ultrafocus mode.

Which frequencies do what

Brainwave ranges correspond to different mental states, and this is the practical foundation of all of it:

• Gamma (~40 Hz): High-demand cognitive processing, active working memory, solving complex problems…
• Beta (14–30 Hz): Active attention, alertness, ideal for ordinary focused work.
• SMR (~12–14 Hz): Calm sustained attention, without overactivation, ideal for long work sessions.
• Alpha (8–12 Hz): Attentive relaxation, creativity, calm concentration.
• Theta (4–8 Hz): Deep meditative states, rest.

The frequencies are not arbitrary and each Mind Focus mode uses the ones corresponding to the state it seeks to induce, also using an intelligent ramp system, adaptation to the time of day, session duration, and so on.

As we can see, there is nothing mysterious or esoteric in any of this, and I am one of the most sceptical people I know.

That’s why Mind Focus is built on proven mechanisms and data that show real results.