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I keep hearing similar high pitched sounds in Tokyo in front of some stores as well, so the statement that only people up to 25 years old can hear it sounds inc

I keep hearing similar high pitched sounds in Tokyo in front of some stores as well, so the statement that only people up to 25 years old can hear it sounds incorrect. The Mosquito youth repellent has even won an Ig Nobel prize: https://www.theguardian.com/uk/2006/oct/06/science.highereducation https://www.theguardian.com/uk/2006/oct/06/science.higheredu... I think this fits the general trend of making urban architecture more and more hostile to the public.

CamJN 7y ago
Ultrasonic jewelry cleaning baths, these sonic youth deterrents, and a few other super high pitched sounds give me instant splitting headaches and I'm 28. Strangely I have terrible hearing otherwise and have to ask people to repeat themselves a lot.
- projct 7y ago
  I was in a similar position for years and got a hearing test. Turns out I have a sensory processing disorder that I got help for.
GuiA 7y ago
I’ve been told the ones in Tokyo are to repel rats and other (non human) pests, but no clue how legit that is.