No idea about audio frequencies close to hearing, but I'm pretty sure it's commo... | Hacker News

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pixl97 4 months ago | parent | context | favorite | on: My smart sleep mask broadcasts users' brainwaves t...

No idea about audio frequencies close to hearing, but I'm pretty sure it's common to manipulate the brain with ultrasonic frequencies these days.

SilentM68 4 months ago [–]

Yeah, I'm sure that technology has existed for decades. Common folks just not allowed to know about it. It's "for our own good!" sarcastically speaking :(

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