And while ultrasound can cause many of the symptoms reported, there’s no evidence that it can cause mild brain injury.
“I know of no acoustic effect that can cause concussion symptoms,” Dr. Altmann said. “Sound going through the air cannot shake your head.”
There lives within me a small and twisted person who is happy to see the myth of the "Brown Note" return. Matryoshka style, theres a smaller and more twisted person within the first that wishes someone's finally figured it out. Perhaps if Theremin were still alive?