The attenuation of bone-conducted stimuli across the human skull was determined in audiometric, ultrasonic, and supersonic frequency ranges (250 to 64,000 Hz). An increase in attenuation with an increase in frequency, as well as significant resonance effects, was observed. For the audiometric frequency range, bone conduction stimulation of one side of the head results in almost equal stimulation of the other side. In the ultrasonic and supersonic ranges, the contralateral side is progressively isolated.
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