This study has established specific ultrasound parameters in the use of low-intensity, low-frequency ultrasound stimulation (LILFUS), designed to mimic the brainwave patterns of theta and gamma oscillations observed during learning and memory processes to induce predictable and long-lasting changes in brain function.
https://www.science.org/doi/10.1126/sciadv.adk3198 (Open access)
The low intensity, low frequency is the new part…
Ultrasound stimulation has been around for a while
How was the ultrasound delivered? A fancy science probe? Can I just recreate this wave form and stick my head near a subwofer.
Ultrasound = higher frequency than human hearing
Infrasound = lower frequency than human hearing
Subwoofers have a low resonant frequency. You want a tweeter that can go well above the range of human hearing to get a speaker that can produce ultrasound.
I realized my mistake a few minutes after typing that and was hoping people would just take it as a meme I was thinking the gamma and theta frequencies but that 500khz is the actual important part that needs special tech.