Diagnosing Cochlear Dead Regions in Children

Malicka, Alicja N.; Munro, Kevin J.; Baker, Richard J.

doi:10.1097/aud.0b013e3181c34ccb

Cited by 17 publications

(23 citation statements)

References 51 publications

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“…The tone will not be detected at its usual place on the basilar membrane but at an adjacent place where the IHCs are functioning more effectively. [2,3] The extent of a DR can be defined in 2 manners: Either by distance along the basilar membrane, described by the characteristic frequencies related to this place (e.g., a DR extending from 4000 to 10 000 Hz), or by the characteristic frequency (CF) of IHCs or neurons adjacent to the DR. [2] The presence of a DR can result in several problems such as abnormal pitch perception, [4] rapid loudness growth, [5] and distorted perception of pure tones. [6] In order to diagnose cochlear DRs, the Threshold Equalizing Noise (TEN) test was developed.…”

Section: Introductionmentioning

confidence: 99%

No cochlear dead regions detected in non-pulsatile tinnitus patients: An assessment with the threshold equalizing noise (sound pressure level) test

Gilles¹,

Ridder

Heyning³

2013

Noise Health

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One of the hypotheses on the etiology of non-pulsatile tinnitus in normal or hearing impaired patients is the existence of sharp edged cochlear dead regions (DR) flanking normal functioning hair cells. The lack of inhibition of DR on the neighboring neurons may lead to hyperactivity. Currently the Threshold Equalizing Noise test (TEN test) is the reference test to clinically assess cochlear DR. To identify cochlear DR in patients with non-pulsatile tinnitus with and without hearing loss using the TEN (sound pressure level)-test. Data were obtained from adult patients with non-pulsatile tinnitus visiting the Tinnitus Clinic of the University Hospital Antwerp. The TEN (SPL)-test was performed to assess the presence of cochlear DR for test frequencies ranging from 0.5 to 8 kHz. A total of 55 ears of 33 subjects (15 male; 18 female) with non-pulsatile tinnitus were included in the study. Subjects were divided into subgroups based on the audiometric configuration of hearing loss: Flat configuration (N = 23), high-frequency gently sloping (N = 10) and high-frequency steeply sloping (N = 22). In forty-eight ears there was no evidence of cochlear DR. In seven ears the results were inconclusive. This occurred in patients with high-frequency steeply sloping audiogram configurations. The present study does not support the TEN (SPL) test as a reliable tool for the detection of cochlear DR in a tinnitus population.

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Section: Introductionmentioning

confidence: 99%

No cochlear dead regions detected in non-pulsatile tinnitus patients: An assessment with the threshold equalizing noise (sound pressure level) test

Gilles¹,

Ridder

Heyning³

2013

Noise Health

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“…However, this discrepancy could be reduced if a version of the TEN test with a wider range of signal frequencies were used. At present is seems reasonable to recommend that the TEN test is used as an initial screening tool, and to get a rough estimate of the value of f e , and the SWPTC test is used to confirm the diagnosis and to obtain a more accurate estimate of f e (Malicka et al, 2010; Moore and Malicka, 2013). …”

Section: Discussionmentioning

confidence: 99%

Cochlear Dead Regions Constrain the Benefit of Combining Acoustic Stimulation With Electric Stimulation

et al. 2014

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Objective The aims of this study were to (i) detect the presence and edge frequency (fe) of a cochlear dead region in the ear with residual acoustic hearing for bimodal cochlear implant (CI) users, and (ii) determine whether amplification based on the presence or absence of a dead region would improve speech understanding and sound quality. Design Twenty two listeners with a CI in one ear and residual acoustic hearing in the non-implanted ear were tested. Eleven listeners had a cochlear dead region in the acoustic-hearing ear and eleven did not. Dead regions were assessed with the threshold equalizing noise (TEN) and the sweeping noise, psychophysical tuning curve (SWPTC) tests. Speech understanding was assessed with monosyllabic words and the AzBio sentences at +10 dB signal-to-noise ratio. Speech and music quality judgments were obtained with the Judgment of Sound Quality questionnaire. Results For this population, using shifted tips of the PTCs as a basis for diagnosis, the TEN had high sensitivity (0.91) and poor specificity (0.55). The value of fe was lower when estimated with the SWPTC test than with the TEN test. For the listeners with cochlear dead regions, speech understanding, speech quality and music quality were best when no amplification was applied for frequencies within the dead region. For listeners without dead regions, speech understanding was best with full-bandwidth amplification and was reduced when amplification was not applied when the audiometric threshold exceeded 80 dB HL. Conclusion Our data suggest that, to improve bimodal benefit for listeners who combine electric and acoustic stimulation, audiologists should routinely test for the presence of cochlear dead regions and determine amplification bandwidth accordingly.

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“…Several investigators used the fast-PTC paradigm with a gated-noise (GN) instead of the swept-noise (SN) masker (Malicka et al, 2009, 2010; Robinson et al, 2007). In this method the masker is pulsed on and off synchronously with the signal, while the masker center frequency changes from block to block in discrete frequency steps.…”

Section: Introductionmentioning

confidence: 99%

“…The GN-PTC method primarily uses an amplitude modulated tone (Malicka et al, 2009, 2010) which is not a standard procedure in PTC measurements. Amplitude modulation is assumed to decrease the risk of beat detection (Malicka et al, 2009) which may arise due to temporal interaction between the masker and the signal.…”

Section: Introductionmentioning

confidence: 99%

“…That study did not reveal significant differences between the PTCs measured with an unmodulated pure-tone signal and with a signal modulated at either a rate of 81 Hz or 88 Hz, for 1000 and 2000 Hz signal frequencies respectively. However, these results could not be directly generalized to the PTC obtained with the fast methods, since in the GN-PTC approach the 8 Hz AM rate was routinely used independently of the signal frequency (Malicka et al, 2009, 2010). …”

Section: Introductionmentioning

confidence: 99%

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Time-efficient measures of auditory frequency selectivity

Charaziak

Souza

Siegel

2011

International Journal of Audiology

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Objective The objective of this study was to compare two recently proposed methods for fast measurements of psychophysical tuning curves (fast-PTCs) in terms of resulting tuning curve features and training effects. Design Fast-PTCs with swept-noise (SN) and gated-noise (GN) maskers were measured at signal frequencies of 500, 1000, 2000 and 4000 Hz. The effect of amplitude modulating the signal in the GN condition was evaluated. Two PTC runs were obtained for each condition to assess training effects. Study Sample Eight normally-hearing young adults participated in the study. Results The SN and GN methods resulted in similar estimates of frequency selectivity when training effects were considered. Amplitude modulating the tone in the GN method reduced the effect of training. On average, SN-PTCs were most repeatable compared to the two other methods and they were not affected by training. Estimation of the shift in the PTC tip frequency was not affected by the measurement method or training effects. Fast-PTC methods resulted in similar estimates of tuning as compared to published notched-noise data. Conclusions The SN method and the GN procedure with amplitude modulated signals allowed for time-efficient estimation of frequency selectivity that was unaffected by training.

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Diagnosing Cochlear Dead Regions in Children

Cited by 17 publications

References 51 publications

No cochlear dead regions detected in non-pulsatile tinnitus patients: An assessment with the threshold equalizing noise (sound pressure level) test

No cochlear dead regions detected in non-pulsatile tinnitus patients: An assessment with the threshold equalizing noise (sound pressure level) test

Cochlear Dead Regions Constrain the Benefit of Combining Acoustic Stimulation With Electric Stimulation

Time-efficient measures of auditory frequency selectivity

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