Peripheral perception mechanism of ultrasonic hearing

Nishimura, Tadashi; Okayasu, Tadao; Uratani, Yuka; Fukuda, Fumi; Saito, Osamu; Hosoi, Hiroshi

doi:10.1016/j.heares.2011.01.004

Cited by 24 publications

(17 citation statements)

References 31 publications

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“…In contrast to ACAS, the outer hair cells do not function in ultrasonic perception (Nishimura et al, 2011;Okayasu et al, 2013). Ultrasound broadly excites the cochlear basal turn, and the range of the excitation is not obviously changed depending on the frequency Table 1 Numeral word list.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, they are masked by ACAS maskers. In contrast, direct ultrasonic stimulation is not easily masked by ACAS maskers, because BCU is not masked by sounds below 8 kHz (Nishimura et al, 2011). By evaluating the change in the intelligibility of speech-modulated BCU by masking, the contribution of demodulation and direct ultrasonic stimulation can be established.…”

Section: Introductionmentioning

confidence: 99%

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An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound

et al. 2014

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“…The mechanisms for detection of BC ultrasound was not completely clarified and several possible explanations have been provided, such as demodulation due to non-linearities in the skull bone (Haeff et al, 1963) or non-linear processing in the cochlea (Nishimura et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Loudness functions with air and bone conduction stimulation in normal-hearing subjects using a categorical loudness scaling procedure

Stenfelt

Zeitooni

2013

Hearing Research

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Loudness functions with air and bone conduction stimulation in normal-hearing subjects using a categorical loudness scaling procedure, 2013, Hearing Research, (301) AbstractIn a previous study (Stenfelt et al., 2002) a loudness balance test between bone conducted (BC) sound and air conducted (AC) sound was performed at frequencies between 0.25 and 4 kHz and at levels corresponding to 30 to 80 dB HL. The main outcome of that study was that for maintaining equal loudness, the level increase of sound with BC stimulation was less than that of AC stimulation with a ratio between 0.8 and 0.93 dB/dB. However, because it was shown that AC and BC tone cancellation was independent of the stimulation level, the loudness level difference did not originate in differences in basilar membrane stimulation. Therefore, it was speculated that the result could be due to the loudness estimation procedure. To investigate this further, another loudness estimation method (adaptive categorical loudness scaling) was here employed in 20 normal-hearing subjects.The loudness of a low-frequency and a high-frequency noise burst was estimated using the adaptive categorical loudness scaling technique when the stimulation was bilaterally by AC or BC. The sounds where rated on an 11-point scale between inaudible and too loud. The total dynamic range for these sounds was over 80 dB when presented by AC (between inaudible and too loud) and the loudness functions were similar for the low and the high-frequency stimulation. When the stimulation was by BC the loudness functions were steeper and the ratios between the slopes of the AC and BC loudness functions were 0.88 for the low-frequency sound and 0.92 for the high-frequency sound.These results were almost equal to the previous published results using the equal loudness estimation procedure, and it was unlikely that the outcome stems from the loudness estimation procedure itself. One possible mechanism for the result was loudness integration of multi-sensory input. However, no conclusive evidence for such a mechanism could be given by the present study.Keywords: Bone conduction, loudness, categorical loudness scaling, multi-sensory integration.3 Highlights• The loudness function was steeper when stimulation was by BC than by AC• The difference between the loudness function slopes was greatest at low frequencies• The average ratios between AC and BC loudness function slopes were between 0.88 and 0.92• The difference between the AC and BC loudness functions were found at both low and high intensities.

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“…Based on these research results, bone-conducted ultrasound hearing aids for most profoundly hearing impaired people have been developed (Nakagawa et al, 2006), however, most of the investigations of speech intelligibility (Okamoto et al, 2006;Kagomiya and Nakagawa, 2010) and the perception mechanism of bone-conducted ultrasound (Nishimura et al, 2003;Nishimura et al, 2011) are currently limited to normal hearing. This study carried out long-term training for two profoundly hearing impaired persons using BCUHAs.…”

Section: Introductionmentioning

confidence: 99%

Speech intelligibility of hearing impaired participants in long-term training of bone-conducted ultrasonic hearing aid

Matsui

Shimokura

Nishimura

et al. 2013

The Journal of the Acoustical Society of America

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Bone-conducted ultrasonic hearing aid (BCUHA) system is the unique device to provide the auditory sensation to profoundly hearing impaired persons without any surgical operations. To clarify effects of a long-term hearing training with this device, two deaf participants engaged the BCUHA training for more than 9 months. They were trained to use BCUHA through repetition of sentences read aloud, free conversation and singing, and then they participated in word recognition tests and monosyllable identification tests. Both participants showed that they could recognize words above chance using auditory sensation only provided by BCUHA if alternatives or context were presented to them. In addition, it was observed that monosyllable intelligibility score with both of auditory and visual cue had much increased with the days of training than the score with the auditory only cue and that with the visual only cue. The result suggests that the long-term training with BCUHA achieves efficient integration of the auditory and the visual cue of speech such as cochlear implant users showed in previous studies.

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Peripheral perception mechanism of ultrasonic hearing

Cited by 24 publications

References 31 publications

An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound

An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound

Loudness functions with air and bone conduction stimulation in normal-hearing subjects using a categorical loudness scaling procedure

Speech intelligibility of hearing impaired participants in long-term training of bone-conducted ultrasonic hearing aid

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