Bone-conducted ultrasounds (BCU) are sensed physiologically differently from normal air-conducted hearing. Bone-conducted ultrasounds do not produce a tonotopic stimulation of neurons in the brain. That is, the nerve cells are not stimulated from low to high frequencies. Other regions appear to be involved. The inner hair cells are involved and the auditory nerve brings the ultrasound signals to the brainstem, but already in the brainstem the BCU follows a different path than audible airborne frequencies.
We can sense ultrasound but not hear ultrasound in the normal sense.
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