Peripheral perception mechanism of ultrasonic hearing

► Ultrasonic hearing is masked by high frequency air-conducted sounds. ► Effective frequency for the masking changes, depending on the intensity. ► Maximum audible frequency is associated with the threshold of ultrasonic hearing. ► The peripheral perceptual region of ultrasonic hearing is located in the cochlea. ► Excitation by bone-conducted ultrasound fast spreads to the low frequency range.