Efeitos da radiação acústica na obtenção dos limiares ósseos

Matos, Renata das Merces Bastos de; Valle, Silvania de Paula; Dias, Anna Marcella Neves; Momensohn-Santos, Teresa Maria; Leite, Isabel Cristina Gonçalves

doi:10.1590/s1808-86942010000500020

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…9,11 One reason for this could be the variability of bone conduction thresholds obtained via mastoid placement of the bone conductor during manual PTA as a result of acoustic radiation which could result in better than actual BC thresholds. 22,23 Another factor influencing the differences found between BC thresholds obtained via the two methods is the forehead placement of the bone conductor in AMTAS as compared to the ipsilateral mastoid placement of the bone conductor in conventional PTA. Various studies have shown that the two placement methods result in differences in the bone conduction thresholds obtained.…”

Section: Questionmentioning

confidence: 99%

A pilot study to validate AMTAS in a specialist outpatient clinic at a public restructured hospital in Singapore

Hui

Chua

Kamath

et al. 2023

Proceedings of Singapore Healthcare

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Background The prevalence of age-related hearing loss is expected to increase with the ageing population in Singapore resulting in increased demand for pure tone audiometry (PTA). One way of meeting the increased demand for PTA is the Automated Method of Testing Auditory Sensitivity (AMTAS). Nonetheless, before AMTAS may be implemented, it is important to validate its results by comparing them against those of conventional PTA for the diverse Singaporean population. Methods 100 participants were recruited from the Otorhinolaryngology clinic at a public hospital. PTA was conducted for participants via the conventional method and AMTAS. The hearing thresholds obtained via the two methods were then compared. A feedback questionnaire on the use of AMTAS was also completed by all participants. Results Air and bone conduction threshold results from 80 participants were analysed. The absolute mean difference in air conduction thresholds obtained via the two methods ranged from 3.30 to 9.62 dB. The absolute mean difference in bone conduction thresholds obtained via the two methods ranged from 8.16 to 9.38 dB. Most participants indicated that the machine was easy to use. Other feedback collected indicated that the AMTAS testing environment was noisy and that testing was fast. Conclusion This study finds that despite differences in hearing thresholds obtained via AMTAS and manual PTA, these differences are within the acceptable 10 dB test-retest variation. Nonetheless, existing issues related to the AMTAS software and noise levels in the testing environment will need to be addressed before it can be used in the clinic.

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Section: Questionmentioning

confidence: 99%

A pilot study to validate AMTAS in a specialist outpatient clinic at a public restructured hospital in Singapore

Hui

Chua

Kamath

et al. 2023

Proceedings of Singapore Healthcare

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Touch and Hearing Mediate Osseoperception

Clemente

Hȧkansson

Cipriani

et al. 2017

Sci Rep

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Osseoperception is the sensation arising from the mechanical stimulation of a bone-anchored prosthesis. Here we show that not only touch, but also hearing is involved in this phenomenon. Using mechanical vibrations ranging from 0.1 to 6 kHz, we performed four psychophysical measures (perception threshold, sensation discrimination, frequency discrimination and reaction time) on 12 upper and lower limb amputees and found that subjects: consistently reported perceiving a sound when the stimulus was delivered at frequencies equal to or above 400 Hz; were able to discriminate frequency differences between stimuli delivered at high stimulation frequencies (~1500 Hz); improved their reaction time for bimodal stimuli (i.e. when both vibration and sound were perceived). Our results demonstrate that osseoperception is a multisensory perception, which can explain the improved environment perception of bone-anchored prosthesis users. This phenomenon might be exploited in novel prosthetic devices to enhance their control, thus ultimately improving the amputees’ quality of life.

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Effects of Stimulation Position and Frequency Band on Auditory Spatial Perception with Bilateral Bone Conduction

Wang

Sang

et al. 2022

Trends in Hearing

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Virtual sound localization tests were conducted to examine the effects of stimulation position (mastoid, condyle, supra-auricular, temple, and bone-anchored hearing aid implant position) and frequency band (low frequency, high frequency, and broadband) on bone-conduction (BC) horizontal localization. Non-individualized head-related transfer functions were used to reproduce virtual sound through bilateral BC transducers. Subjective experiments showed that stimulation at the mastoid gave the best performance while the temple gave the worst performance in localization. Stimulation at the mastoid and condyle did not differ significantly from that using air-conduction (AC) headphones in localization accuracy. However, binaural reproduction at all BC stimulation positions led to similar levels of front-back confusion (FBC), which were also comparable to that with AC headphones. Binaural BC reproduction with high-frequency stimulation led to significantly higher localization accuracy than with low-frequency stimulation. When transcranial attenuation (TA) was measured, the attenuation became larger at the condyle and mastoid, and increased at high frequencies. The experiments imply that larger TAs may improve localization accuracy but do not improve FBC. The present study indicates that the BC stimulation at the mastoid and condyle can effectively convey spatial information, especially with high-frequency stimulation.

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Efeitos da radiação acústica na obtenção dos limiares ósseos

Cited by 4 publications

References 5 publications

A pilot study to validate AMTAS in a specialist outpatient clinic at a public restructured hospital in Singapore

A pilot study to validate AMTAS in a specialist outpatient clinic at a public restructured hospital in Singapore

Touch and Hearing Mediate Osseoperception

Effects of Stimulation Position and Frequency Band on Auditory Spatial Perception with Bilateral Bone Conduction

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