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Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect (2000)
- stephengillie 12y agoI'm not sure how related this is, but I used to get bad headaches from the ultrasonic sensors on my self-driving RC car project. I always wondered if others were affected, and how that impacted other ultrasonic-based projects.
- s_baby 12y agoI had the same problem with my computer fan.
- underwater 12y agoI worked on a project where I used ~20kHz tones to transmit data between devices. I also got headaches.
- rd108 12y agoApparently the high frequency alone did not effect brain activity unless coupled to audible or "low frequency" sounds. I wonder if the two frequencies interact to form beat frequencies or complex wave superpositions in the audible range. That would jive with this description of the Japanese researchers' instrument: "Traditional gamelan music of Bali Island, Indonesia, a natural sound source containing the richest amount of high frequencies with a conspicuously fluctuating structure, was chosen as the sound source for all experiments." Alpha brainwaves, which were seen when both high and low frequencies were combined, correlate with being "relaxed and alert". Interesting findings.
- seanp2k2 12y agoWelp, I guess here's your evidence for 24/192 audio being not-useless.
- droidist2 12y agoOhh, beat me to it. Nice.