Role of slow temporal modulations in speech identification for cochlear implant users

Gnansia, Dan; Lazard, Diane S.; Léger, Agnès C.; Fugain, C; Lancelin, Denis; Meyer, B.; Lorenzi, Christian

doi:10.3109/14992027.2013.844367

Cited by 22 publications

(25 citation statements)

References 39 publications

(59 reference statements)

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“…Given that the attenuation rate is mainly determined by the AMDTs at higher modulation frequencies, the results of Won et al suggest that CI users with better thresholds for high modulation frequencies obtain better speech understanding scores. In a recent study by Gnansia et al (2014), sound field AMDTs measured at a low modulation frequency of 8 Hz also correlated significantly with vowel and consonant identification scores in quiet. In noise, no significant correlations were found (Gnansia et al 2014).…”

Section: Introductionmentioning

confidence: 80%

“…In a recent study by Gnansia et al (2014), sound field AMDTs measured at a low modulation frequency of 8 Hz also correlated significantly with vowel and consonant identification scores in quiet. In noise, no significant correlations were found (Gnansia et al 2014). Because in all these studies only postlingually deafened CI users were tested, it is unknown whether a correlation exists between amplitude modulation detection measures and speech performance scores for prelingually deafened CI users.…”

Section: Introductionmentioning

confidence: 80%

“…The authors hypothesize that the effect might be due to interferences from the gating, which consequently "mask" some of the modulations. More recently, there are no studies where a gated broadband noise stimulus was used in combination with modulation frequencies below 10 Hz (except for Gnansia et al (2014), but no TMTF was determined there).…”

Section: Prelingualmentioning

confidence: 97%

“…Also using electric stimulation, Luo et al (2008) found a significant correlation between AMDTs at both the 100-Hz and the 20-Hz modulation frequency and consonant recognition and sentence recognition scores but not vowel recognition scores. Recently, Gnansia et al (2014) found a significant correlation between sound field AMDTs at a modulation frequency of 8 Hz and consonant and vowel identification scores.…”

Section: The Relation Between Sensitivity To Amplitude Modulation Andmentioning

confidence: 98%

“…In most of these studies, the electrical stimulus was presented directly to one or more electrodes using computer-controlled stimulation, bypassing the clinical sound processor. Recently, however, Won et al (2011) and Gnansia et al (2014) conducted studies in which stimuli were presented 558 DE RUITER ET AL. / EAR & HEARING,VOL.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Amplitude Modulation Detection and Speech Recognition in Late-Implanted Prelingually and Postlingually Deafened Cochlear Implant Users

et al. 2015

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Prelingually deafened CI users were less sensitive to temporal modulations than postlingually deafened CI users, and the attenuation rate of their TMTF was steeper. For all CI users, subjects with better amplitude modulation detection skills tended to score better on measures of speech understanding. Significant correlations with low modulation frequencies were found only for the prelingually deafened CI users and not for the postlingually deafened CI users.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 80%

Section: Prelingualmentioning

confidence: 97%

Section: The Relation Between Sensitivity To Amplitude Modulation Andmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Amplitude Modulation Detection and Speech Recognition in Late-Implanted Prelingually and Postlingually Deafened Cochlear Implant Users

et al. 2015

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Acoustic Temporal Modulation Detection in Normal-Hearing and Cochlear Implanted Listeners: Effects of Hearing Mechanism and Development

Park

Won

Horn

et al. 2015

JARO

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Temporal modulation detection ability matures over many years after birth and may be particularly sensitive to experience during this period. Profound hearing loss during early childhood might result in greater perceptual deficits than a similar loss beginning in adulthood. We tested this idea by measuring performance in temporal modulation detection in profoundly deaf children and adults fitted with cochlear implants (CIs). At least two independent variables could constrain temporal modulation detection performance in children with CIs: altered encoding of modulation information due to the CIauditory nerve interface, and atypical development of central processing of sound information provided by CIs. The effect of altered encoding was investigated by testing subjects with one of two different hearing mechanisms (normal hearing vs. CI) and the effect of atypical development was studied by testing two different age groups. All subjects were tested for their ability to detect acoustic temporal modulations of sound amplitude. A comparison of the slope, or cutoff frequency, of the temporal modulation transfer functions (TMTFs) among the four subject groups revealed that temporal resolution was mainly constrained by hearing mechanism: normal-hearing listeners could detect smaller amplitude modulations at high modulation frequencies than CI users. In contrast, a comparison of the height of the TMTFs revealed a significant interaction between hearing mechanism and age group on overall sensitivity to temporal modulation: sensitivity was significantly poorer in children with CIs, relative to the other three groups. Results suggest that there is an agespecific vulnerability of intensity discrimination or non-sensory factors, which subsequently affects sensitivity to temporal modulation in prelingually deaf children who use CIs.

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Spectro-temporal cues enhance modulation sensitivity in cochlear implant users

2017

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Although speech understanding is highly variable amongst cochlear implants (CIs) subjects, the remarkably high speech recognition performance of many CI users is unexpected and not well understood. Numerous factors, including neural health and degradation of the spectral information in the speech signal of CIs, likely contribute to speech understanding. We studied the ability to use spectro-temporal modulations, which may be critical for speech understanding and discrimination, and hypothesize that CI users adopt a different perceptual strategy than normal-hearing (NH) individuals, whereby they rely more heavily on joint spectro-temporal cues to enhance detection of auditory cues. Modulation detection sensitivity was studied in CI users and NH subjects using broadband “ripple” stimuli that were modulated spectrally, temporally, or jointly, i.e., spectro-temporally. The spectro-temporal modulation transfer functions of CI users and NH subjects was decomposed into spectral and temporal dimensions and compared to those subjects’ spectral-only and temporal-only modulation transfer functions. In CI users, the joint spectro-temporal sensitivity was better than that predicted by spectral-only and temporal-only sensitivity, indicating a heightened spectro-temporal sensitivity. Such an enhancement through the combined integration of spectral and temporal cues was not observed in NH subjects. The unique use of spectro-temporal cues by CI patients can yield benefits for use of cues that are important for speech understanding. This finding has implications for developing sound processing strategies that may rely on joint spectro-temporal modulations to improve speech comprehension of CI users, and the findings of this study may be valuable for developing clinical assessment tools to optimize CI processor performance.

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Role of slow temporal modulations in speech identification for cochlear implant users

Abstract: Sensitivity to slow amplitude modulations is correlated with vowel and consonant perception in CI users. However, reduced sensitivity to slow modulations does not entirely explain the limited capacity of CI recipients to understand speech in noise.

Cited by 22 publications

References 39 publications

Amplitude Modulation Detection and Speech Recognition in Late-Implanted Prelingually and Postlingually Deafened Cochlear Implant Users

Amplitude Modulation Detection and Speech Recognition in Late-Implanted Prelingually and Postlingually Deafened Cochlear Implant Users

Acoustic Temporal Modulation Detection in Normal-Hearing and Cochlear Implanted Listeners: Effects of Hearing Mechanism and Development

Spectro-temporal cues enhance modulation sensitivity in cochlear implant users

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