Interesting technology, and of course transcranial ultrasound has been around for a while. But ultrasound even at low doses, does stimulate neurons in the brain, and so until we have more data I would be careful about applying it to the entire brain or portions thereof. transcranial focused ultrasound, which has been studied and shows great potential in medical or therapeutic domains, is highly precise, and even then we see that it can have adverse neuropsychological effects depending on the area stimulated, frequency, used, duration, and natural variance between individuals.