Experimental Analysis of the Mechanism of Hearing under Water

Figure 2

Bar graphs showing the air-underwater intensity differences in dB which elicited threshold in normal participants and which induced vibrations of skull bone at the 4 stimulus frequencies. Since the intensities delivered under water to the skull at 0.5, 2.0, and 4.0 kHz even at the maximum output of the audiometer did not induce skull vibrations, the maximal output was used in the calculation of the intensity differences for skull vibration, with an upward pointing arrow, to indicate that the intensity differences at these frequencies were even greater. For 1.0 kHz, the intensity used in this calculation is that which induced skull vibrations.