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Loudness Growth Functions and EABR Characteristics in Digisonic Cochlear Implantees.

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Title: Loudness Growth Functions and EABR Characteristics in Digisonic Cochlear Implantees.
Authors: Gallégo, S., Garnier, S., Micheyl, C., Truy, E., Morgon, A., Collet, L.
Source: Acta Oto-Laryngologica. 4/22/99, Vol. 119 Issue 2, p234-238. 5p.
Subjects: Auditory evoked response, Cochlear implants
Abstract: Electrically evoked auditory brainstem responses (EABRs) and loudness functions were measured in 14 subjects equipped with an MXM Digisonic cochlear implant. EABRs were evoked by 75-Hz pulse trains presented on the apical electrode. Loudness functions at the same rate and at a rate more conventional for psychoacoustic measurements (300 Hz) were measured using a categorical loudness-scaling procedure. The results revealed a significant difference in the loudness functions measured at 75 and 300 Hz, loudness increasing more steeply with stimulus intensity for the latter rate. Significant correlations between EABR wave V thresholds and perceptual thresholds measured at both 75 and 300 Hz were observed. Furthermore, in 8 out of the 14 patients, EABR wave V saturated at a stimulus level corresponding precisely to the loudest bearable, i.e. “Too loud” level for the 300-Hz stimulation rate; this same level corresponded to the “Comfortable” loudness level for the 75-Hz stimulation rate. On average, an almost linear relationship was observed over the first half of the loudness range between the stimulus intensity, expressed as a pulse duration in log units, and wave V amplitude in dB. Although further investigation is required before maximum comfort levels can be predicted reliably from EABR measures in individual subjects, these results indicate new directions regarding the estimation of perceptual dynamic range limits on the basis of EABR measures in cochlear implantees. [ABSTRACT FROM AUTHOR]
Copyright of Acta Oto-Laryngologica is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Loudness Growth Functions and EABR Characteristics in Digisonic Cochlear Implantees.
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  Data: <searchLink fieldCode="AR" term="%22Gallégo%2C+S%2E%22">Gallégo, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Garnier%2C+S%2E%22">Garnier, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Micheyl%2C+C%2E%22">Micheyl, C.</searchLink><br /><searchLink fieldCode="AR" term="%22Truy%2C+E%2E%22">Truy, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Morgon%2C+A%2E%22">Morgon, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Collet%2C+L%2E%22">Collet, L.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Acta+Oto-Laryngologica%22">Acta Oto-Laryngologica</searchLink>. 4/22/99, Vol. 119 Issue 2, p234-238. 5p.
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  Data: Electrically evoked auditory brainstem responses (EABRs) and loudness functions were measured in 14 subjects equipped with an MXM Digisonic cochlear implant. EABRs were evoked by 75-Hz pulse trains presented on the apical electrode. Loudness functions at the same rate and at a rate more conventional for psychoacoustic measurements (300 Hz) were measured using a categorical loudness-scaling procedure. The results revealed a significant difference in the loudness functions measured at 75 and 300 Hz, loudness increasing more steeply with stimulus intensity for the latter rate. Significant correlations between EABR wave V thresholds and perceptual thresholds measured at both 75 and 300 Hz were observed. Furthermore, in 8 out of the 14 patients, EABR wave V saturated at a stimulus level corresponding precisely to the loudest bearable, i.e. “Too loud” level for the 300-Hz stimulation rate; this same level corresponded to the “Comfortable” loudness level for the 75-Hz stimulation rate. On average, an almost linear relationship was observed over the first half of the loudness range between the stimulus intensity, expressed as a pulse duration in log units, and wave V amplitude in dB. Although further investigation is required before maximum comfort levels can be predicted reliably from EABR measures in individual subjects, these results indicate new directions regarding the estimation of perceptual dynamic range limits on the basis of EABR measures in cochlear implantees. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Oto-Laryngologica is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: 4/22/99
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