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September 26, 2021

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Hi Brian,

This is David from Team Mendi. First of all, I want to thank you for being a Mendi user and for taking the time to share your experiences and thoughts about the device.

I can assure you that Mendi’s measurement of your blood oxygenation in your PFC isn’t random. Our device has been validated by researchers to outperform hardware devices costing $20K+. Mendi is bringing this advanced technology into a consumer-grade hardware device for the first time and we have made significant improvements to the overall design to accommodate this.

You are right in that, just like with fNIRS-based lab equipment, Mendi is sensitive to external light sources. During research and in neurofeedback clinics, they often put layers of “bandage” around their headsets to shield it from external light.

We currently recommend users to practice in a dimly lit or dark room to increase the ability for the device to read your blood flow correctly, simply because this will make it easier for you to learn how to control the movement of the ball. It’s also important not to move around too much, particularly your eyebrows, which are very close to the Mendi device and can therefore accidentally move the device and confuse it.

The good news is that we are hard at work to fix this, and I’m extremely excited about the new signal processing algorithm that the team has been developing. The next release that we’re scheduling in the next month has a 40% quicker response from detected PFC activity to the movement of the ball on the screen, as well as making it work well with a wider range of bright conditions (including certain LED lights) that can otherwise interfere with the signal.

And that’s just the starting point. Over the next several months, we’ll be rolling out a number of important enhancements to further strengthen the environmental resilience of Mendi, as in, its ability to handle scenarios that have traditionally been well outside of scope for high-tech fNIRS-based neurofeedback training, such as the ability to use it in a brightly lit room, outdoors, or even when moving around.

We’re very humbled by the fact that users are reporting life-changing results from consistent training with Mendi - but we are not surprised, because we know from existing science that the brain is becoming healthier with each session as your neural pathways are strengthened.

We’re also excited to release the next phase of Mendi, which will combine goal-based neurofeedback brain training with behavioural science. This is what we call the Mendi Brain Health model, which is rooted in the most recent neuroscience as a product of our collaboration with top scientists. It’s something that has never been done before.

At the same time, this doesn’t distract us from the important work to ship the best neurofeedback-based brain training product on the market, including all the improvements I mentioned above - but we believe that the introduction of Mendi’s full brain health model will shift the focus a little bit from the in-game session scores to the long-term improvements we’re making on your brain health.

Again, thank you for being a Mendi user and for your candid feedback about your journey with it so far!

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