Comment by titzer

One could argue that people don't "hear" anything but the electrical signals transmitted from their ears to their brain. If an ultrasonic signal causes someone to perceive a noise--any noise, even if waveform-translated from the original, but in a predictable fashion, isn't it "hearing"? E.g. if we set up a chime that went "bing bong" every time the cat went through the cat door, after a while wouldn't it be appropriate to ask your roommate, "Did you hear the cat come in?"