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

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		pixl97 65 days 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 65 days 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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