man put a patch over his eyes in purpose to pose blind and then started wearing "echolocator" to learn how to become a bathe put on a hat which comes attached with a device that turns ultrasound into human hearable rangethen the device sends ultrasound and also receives it when a ultrasoundwave bounces from an obstacle back to the deviceeventhough human doesnt hear ultrasound itself the device turns the same waveform into human hearable range>it became possible to retrain human brain, when blindsided, to navigate with ultrasound as long as you were able to hear the ultrasound, which naturally wuld be impossible without a device that tunes ultrasound into a hearable frequency in realtimeit takes 10 weeks to train properly but then its like riding a bike>it still needs to send ultrasound waves becouse only those will bounce back to create echolocation effect, you will know if you are 1 meter away from an obstacle or farther, or closernormal hearing range DOES NOT produce echolocation effectultrasound is 20 000 Hz+ often around 30 000 Hz>bats use 33 000 Hzsome humans can naturally hear 20 500 Hz altough rare, normal upper limit is exactly 20 000https://doi.org/10.1371/journal.pone.0252330
>>539556683That’s Sarah’s boy! Glad to hear the Covid missed him.
>>539556683Bretty cool
