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

Ruiter, Anke M. De; Debruyne, Joke; Chenault, Michelene N.; Francart, Tom; Brokx, J.P.L.

doi:10.1097/aud.0000000000000162

Cited by 20 publications

(17 citation statements)

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“…The temporal envelope is even more important for CI users because the CI cannot extract adequate spectral information due to a limited number of frequency channels (Shannon et al, 1995;Fu, 2002), whereas low frequency temporal information is relatively well delivered through the CI. Since behavioral studies have shown that the ability to detect temporal variations has a strong correlation with speech perception (Won et al, 2011;De Ruiter et al, 2015), there has been an effort to measure how the brain processes temporal variations using auditory-evoked responses such as the ASSR and the mismatch negativity response. Using EASSRs to AM pulse trains of 4 and 40 Hz, Luke et al (2015) found that the EASSR amplitudes at 40 Hz were related to the AM detection thresholds in five CI users and suggested the clinical significance of EASSR as an objective measure of site-specific temporal sensitivity for CIs.…”

Section: Am Change As a Paradigm To Assess Cortical Temporal Processimentioning

confidence: 99%

“…Compared with normal-hearing (NH) individuals, the TMTF of CI users has a higher overall AM threshold that is more pronounced at higher frequencies resulting in a lower frequency TMTF filter cutoff and subsequently this property is associated with reduced speech perception ability (Won et al, 2011). The ability to detect high-frequency AM (50-300 Hz) is correlated to speech perception in CI users including tone (Luo et al, 2008), consonants (Cazals et al, 1994), and word recognition (Won et al, 2011) and phonemes (De Ruiter et al, 2015). Recently, low frequency AM rate discrimination at 4 Hz shortly after CI activation time was shown to be a predictor of speech perception at 6 months post-activation (Erb et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Change Responses to Amplitude Modulation in Cochlear Implant Users: Relationships to Speech Perception

Han

Dimitrijevic

2020

Front. Neurosci.

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Objectives: The ability to understand speech is highly variable in people with cochlear implants (CIs) and to date, there are no objective measures that identify the root of this discrepancy. However, behavioral measures of temporal processing such as the temporal modulation transfer function (TMTF) has previously found to be related to vowel and consonant identification in CI users. The acoustic change complex (ACC) is a cortical auditory-evoked potential response that can be elicited by a "change" in an ongoing stimulus. In this study, the ACC elicited by amplitude modulation (AM) change was related to measures of speech perception as well as the amplitude detection threshold in CI users.Methods: Ten CI users (mean age: 50 years old) participated in this study. All subjects participated in behavioral tests that included both speech and amplitude modulation detection to obtain a TMTF. CI users were categorized as "good" (n = 6) or "poor" (n = 4) based on their speech-in noise score (<50%). 64-channel electroencephalographic recordings were conducted while CI users passively listened to AM change sounds that were presented in a free field setting. The AM change stimulus was white noise with four different AM rates (4, 40, 100, and 300 Hz). Results:Behavioral results show that AM detection thresholds in CI users were higher compared to the normal-hearing (NH) group for all AM rates. The electrophysiological data suggest that N1 responses were significantly decreased in amplitude and their latencies were increased in CI users compared to NH controls. In addition, the N1 latencies for the poor CI performers were delayed compared to the good CI performers. The N1 latency for 40 Hz AM was correlated with various speech perception measures.Conclusion: Our data suggest that the ACC to AM change provides an objective index of speech perception abilities that can be used to explain some of the variation in speech perception observed among CI users.

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Section: Am Change As a Paradigm To Assess Cortical Temporal Processimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic Change Responses to Amplitude Modulation in Cochlear Implant Users: Relationships to Speech Perception

Han

Dimitrijevic

2020

Front. Neurosci.

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“…It is known that CI listeners can make considerable use of AMs to assist with speech recognition (Shannon et al, 1995), as evidenced by some remarkable early studies that showed implant recipients could obtain a degree of speech understanding with only a single channel device (Tyler, 1988;Rosen et al, 1989;Rosen, 1992). This demonstrates that a large proportion of the information necessary for successful speech recognition is associated with the modulating envelope of speech signals (De Ruiter et al, 2015;Dimitrijevic et al, 2016;Han and Dimitrijevic, 2020). Therefore, it is plausible that poor speech performance amongst CI users could result from inadequate transmission of the AM signal from the CI to the brain.…”

Section: Introductionmentioning

confidence: 99%

The Benefit of Cross-Modal Reorganization on Speech Perception in Pediatric Cochlear Implant Recipients Revealed Using Functional Near-Infrared Spectroscopy

Mushtaq

Wiggins

Kitterick

et al. 2020

Front. Hum. Neurosci.

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Cochlear implants (CIs) are the most successful treatment for severe-to-profound deafness in children. However, speech outcomes with a CI often lag behind those of normally-hearing children. Some authors have attributed these deficits to the takeover of the auditory temporal cortex by vision following deafness, which has prompted some clinicians to discourage the rehabilitation of pediatric CI recipients using visual speech. We studied this cross-modal activity in the temporal cortex, along with responses to auditory speech and non-speech stimuli, in experienced CI users and normallyhearing controls of school-age, using functional near-infrared spectroscopy. Strikingly, CI users displayed significantly greater cortical responses to visual speech, compared with controls. Importantly, in the same regions, the processing of auditory speech, compared with non-speech stimuli, did not significantly differ between the groups. This suggests that visual and auditory speech are processed synergistically in the temporal cortex of children with CIs, and they should be encouraged, rather than discouraged, to use visual speech.

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“…If the child chooses a wrong pictured word that has the correct stress pattern, it still scores a point in stress perception. While the MTS is a commonly used tool for the evaluation of speech perception and employed also nowadays with adult CI users (e.g., De Ruiter et al, 2015 ), one problem of the test is that it confounds stress pattern perception with the number of syllables in the case of the monosyllables. Another problem is that it can be only performed with children old enough to understand the task and point at the correct picture and who have already acquired a certain set of vocabulary.…”

Section: Introductionmentioning

confidence: 99%

The Perception of Stress Pattern in Young Cochlear Implanted Children: An EEG Study

et al. 2016

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Children with sensorineural hearing loss may (re)gain hearing with a cochlear implant—a device that transforms sounds into electric pulses and bypasses the dysfunctioning inner ear by stimulating the auditory nerve directly with an electrode array. Many implanted children master the acquisition of spoken language successfully, yet we still have little knowledge of the actual input they receive with the implant and specifically which language sensitive cues they hear. This would be important however, both for understanding the flexibility of the auditory system when presented with stimuli after a (life-) long phase of deprivation and for planning therapeutic intervention. In rhythmic languages the general stress pattern conveys important information about word boundaries. Infant language acquisition relies on such cues and can be severely hampered when this information is missing, as seen for dyslexic children and children with specific language impairment. Here we ask whether children with a cochlear implant perceive differences in stress patterns during their language acquisition phase and if they do, whether it is present directly following implant stimulation or if and how much time is needed for the auditory system to adapt to the new sensory modality. We performed a longitudinal ERP study, testing in bimonthly intervals the stress pattern perception of 17 young hearing impaired children (age range: 9–50 months; mean: 22 months) during their first 6 months of implant use. An additional session before the implantation served as control baseline. During a session they passively listened to an oddball paradigm featuring the disyllable “baba,” which was stressed either on the first or second syllable (trochaic vs. iambic stress pattern). A group of age-matched normal hearing children participated as controls. Our results show, that within the first 6 months of implant use the implanted children develop a negative mismatch response for iambic but not for trochaic deviants, thus showing the same result as the normal hearing controls. Even congenitally deaf children show the same developing pattern. We therefore conclude (a) that young implanted children have early access to stress pattern information and (b) that they develop ERP responses similar to those of normal hearing children.

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

Cited by 20 publications

References 37 publications

Acoustic Change Responses to Amplitude Modulation in Cochlear Implant Users: Relationships to Speech Perception

Acoustic Change Responses to Amplitude Modulation in Cochlear Implant Users: Relationships to Speech Perception

The Benefit of Cross-Modal Reorganization on Speech Perception in Pediatric Cochlear Implant Recipients Revealed Using Functional Near-Infrared Spectroscopy

The Perception of Stress Pattern in Young Cochlear Implanted Children: An EEG Study

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