Abstract
Ultrasonic vibration generates a sensation of sound via bone conduction; the phenomenon is called bone‐conducted ultrasonic (BCU) hearing. Complex sounds also can be perceived by an amplitude‐modulated BCU (AM‐BCU). In this study, to investigate whether listeners can use an interaural time difference (ITD) in the amplitude envelope and an intensity difference (IID) as cues for lateralization, difference limens for an ITD (ITDL) and an IID (IIDL) for AM‐BCU were evaluated. Thirty‐kHz sine waves modulated by low‐passed noises with cutoff frequencies of 250, 500, 1000, 2000, and 4000 Hz were used as the AM‐BCU stimuli. ITDLs and IIDLs for air‐conducted (AC) low‐passed noises which correspond to modulator of the AM‐BCU were also evaluated. Both ITDLs and IIDLs for AM‐BCU were observed; AM‐BCU was larger in ITDL and smaller in IIDL than AC. The results suggest that it is possible to lateralize AM‐BCU using ITD in the envelope and/or IID; however, IID is a more effective cue than ITD.
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