Cochlear implanted children present vocal parameters within normal standards

A meta-analysis of expressive prosody in cochlear implant users

INTRODUCTION

Prosody is used to express indexical (identifying the talker), linguistic (e.g., question intonation, lexical stress), pragmatic (e.g., contrastive stress, sarcasm), and emotional/affective functions. It is manifested through changes in fundamental frequency (f0), intensity, and duration. F0 and intensity are degraded when perceived through a cochlear implant (CI). The purpose of this meta-analysis is to compare expressive prosody in speech produced by CI users versus normal hearing peers.

METHODS

A systematic search of the literature found 25 articles that met all inclusion criteria. These articles were assessed for quality, and data pertaining to the expression of f0, intensity, and duration, as well as classification accuracy and appropriateness ratings from normal hearing listeners, were extracted and meta-analyzed using random effects models.

RESULTS

The articles included in the meta-analysis were generally of acceptable or high quality. Meta-analyses revealed significant differences between individuals with CIs vs. normal hearing on all measures except mean f0, mean intensity, and rhythm. Effect sizes were generally medium to large. There was significant heterogeneity across studies, but little evidence of publication bias.

CONCLUSIONS

CI users speak with less variable f0, smaller f0 contours, more variable intensity, a slower speech rate, and reduced final lengthening at syntactic boundaries. These acoustic differences are reflected in significantly poorer ratings of speech produced by CI users compared to their normal hearing peers, as assessed by groups of normal hearing listeners. Because atypical expressive prosody is associated with negative outcomes, clinicians should consider targeting prosody when working with individuals who use CIs.

Voice acoustic characteristics of children with late-onset cochlear implantation: Correlation to auditory performance

OBJECTIVES

To study the voice acoustic parameters of congenitally deaf children with delayed access to sounds due to late-onset cochlear implantation and to correlate their voice characteristics with their auditory performance.

METHODS

The study included 84 children: a control group consisting of 50 children with normal hearing and normal speech development; and a study group consisting of 34 paediatric cochlear implant (CI) recipients who had suffered profound hearing loss since birth. According to speech recognition scores and pure-tone thresholds, the study group was further subdivided into two subgroups: 24 children with excellent auditory performance and 10 children with fair auditory performance. The mean age at the time of implantation was 3.6 years for excellent auditory performance group and 3.2 years for fair auditory performance group. Voice acoustic analysis was conducted on all study participants.

RESULTS

Analysis of voice acoustic parameters revealed a statistically significant delay in both study groups in comparison to the control group. However, there was no statistically significant difference between the two study groups.

DISCUSSION

Interestingly, in both excellent and fair performance study groups, the gap in comparison to normal hearing children was still present. While late-implanted children performed better on segmental perception (e.g. word recognition), suprasegmental perception (e.g. as demonstrated by objective acoustic voice analysis) did not progress to the same extent.

CONCLUSION

On the suprasegmental speech performance level, objective acoustic voice measurements demonstrated a significant delay in the suprasegmental speech performance of children with late-onset CI, even those with excellent auditory performance.

Voice Parameters in Children With Cochlear Implants: A Systematic Review and Meta-Analysis

INTRODUCTION

An intact auditory system is essential for the development and maintenance of voice quality and speech prosody. On the contrary hearing loss affects the adjustments and appropriate use of organs involved in speech and voice production. Spectro-acoustic voice parameters have been evaluated in Cochlear Implant (CI) users, and the authors of previous systematic reviews on the topic concluded that fundamental frequency (F0) seemed preliminarily the most reliable parameter to evaluate voice alterations in adult CI users. The main aim of this systematic review and meta-analysis was to clarify the vocal parameters and prosodic alterations of speech in pediatric CI users.

MATERIALS AND METHODS

The protocol of the systematic review was registered on the PROSPERO database, International prospective register of systematic reviews. We conducted a search of the English literature published in the period between January 1, 2005 and April 1, 2022 on the Pubmed and Scopus databases. A meta-analysis was conducted to compare the values of voice acoustic parameters in CI users and non-hearing-impaired controls. The analysis was conducted using the standardized mean difference as the outcome measure. A random-effects model was fitted to the data.

RESULTS

A total of 1334 articles were initially evaluated using title and abstract screening. After applying inclusion/exclusion criteria, 20 articles were considered suitable for this review. The age of the cases ranged between 25 and 132 months at examination. The most studied parameters were F0, Jitter, Shimmer and Harmonics-to-Noise Ratio (HNR); other parameters were seldom reported. A total of 11 studies were included in the meta-analysis of F0, with the majority of estimates being positive (75%); the estimated average standardized mean difference based on the random-effects model was 0.3033 (95% CI: 0.0605 to 0.5462; P = 0.0144). For Jitter (0.2229; 95% CI: -0.1862 to 0.7986; P = 0.2229) and shimmer (0.2540; 95% CI: -0.1404 to 0.6485; P = 0.2068) there was a trend toward positive values without reaching statistical significance.

DISCUSSION AND CONCLUSIONS

This meta-analysis confirmed that higher F0 values have been observed in the pediatric population of CI users compared to age-matched normal hearing volunteers, whereas the parameters of voice noise were not significantly different between cases and controls. Prosodic aspects of language need further investigations. In longitudinal contexts, prolonged auditory experience with CI has brought voice parameters closer to the norm. Following the available evidence, we stress the utility of inclusion of vocal acoustic analysis in the clinical evaluation and follow-up of CI patients to optimize the rehabilitation process of pediatric patients with hearing loss.

Subjective Voice Handicap and Vocal Tract Discomfort in Patients With Cochlear Implant

OBJECTIVES

Changes in the auditory system, for example due to hearing impairment, can cause changes in breathing, phonation, and articulation. Aim of this study was to provide first data on subjective Voice Handicap and Vocal Tract Discomfort in subjects with hearing impairment and cochlear implant (CI) after initial fitting.

STUDY DESIGN

Prospective cross-sectional study METHODS: A total of 111 participants (57 female and 54 male) between 20 and 85 years of age (mean = 58.21, SD = 14.96) were recruited between October 2019 and March 2020 from the Clinic of Otorhinolaryngology at Medical University of Hannover. Participants were tested after initial CI fitting, six weeks after implantation, using the German version of the VTD (Vocal Tract Discomfort) Scale and VHI (9i) (Voice Handicap Index) as well as speech comprehension tests and a specifically developed questionnaire evaluating data concerning voice usage and other influential factors. Statistics included descriptive analysis, group comparisons (t-Test), Pearson correlation coefficient between VTD Scale and VHI, and hearing status.

RESULTS

Patients with CI did show low scores in VTD Scale and VHI-9i (VTD mean = 7.85 [SD = 10.4]; VHI-9i mean = 4.04 [SD = 5.77]). We found neither a correlation between any of the speech comprehension tests and the VTD Scale nor the VHI-9i. Further, we could show no correlation between subjective Voice Handicap and/or Vocal Tract Discomfort and age or the kind of treatment.

CONCLUSION

Patients included in this study did not show more subjective Voice Handicap or Vocal Tract Discomfort than normal hearing peers. Scores of VTD Scale and VHI-9i did not depend on the duration of hearing loss, speech comprehension, kind of treatment or age.

Acoustic and Aerodynamic Analyses of the Voice of Prelingually Deaf Young Men After Cochlear Implantation

OBJECTIVE

The purpose of this study was to characterize the acoustic and aerodynamics of the voice of young men with prelingual deafness after cochlear implantation (CI) to provide a theoretical basis for their rehabilitation after CI.

METHODS

The CI group included 17 young men with prelingual deafness who implanted cochlear at 18-24 years old. The control group included 17 normally hearing young men at the same age. The 10-item Voice Handicap Index, acoustic parameters, and aerodynamic parameters were evaluated.

RESULTS

For the acoustic parameters, the F0, SDF0, and Jitter of the CI group were higher than those of the Control group, and these differences were statistically significant. Additionally, The difference in mean shimmer and mean NHR values between the CI group and the Control group was not statistically significant For the aerodynamic parameters, the subglottal pressure and aerodynamic power of the CI group were significantly higher than those of the Control group, whereas the MPT was significantly shorter.

DISCUSSION

Due to excessive stress on the laryngeal muscle and limited pneumo-phono-articulatory coordination, the young men in the CI group had a thin voice and poor voice control and muscle coordination, and they exhibited excessive laryngeal resistance. We propose that after CI, in addition to regular hearing and speech rehabilitation, voice training is also extremely important for prelingually deaf young men.

Voz de crianças e adolescentes deficientes auditivos e pares ouvintes: influência da percepção auditiva da fala na produção vocal

RESUMO Objetivo: Comparar os resultados acústicos e perceptivo-auditivos da voz de crianças e adolescentes deficientes auditivos com pares ouvintes e correlacionar estes resultados com o relato dos pais em relação à percepção auditiva da fala. Método: Os participantes foram divididos em dois grupos: grupo I, 20 crianças e adolescentes deficientes auditivos, e grupo II, 20 crianças e adolescentes ouvintes. Foi realizada análise acústica da vogal /a/ e avaliação perceptivo-uditiva da vogal /a/ e da fala. A percepção auditiva do GI foi avaliada utilizando a Escala de Integração Auditiva Significativa para Crianças Pequenas e a Escala de Integração Auditiva Significativa, com adaptação para participantes adolescentes. Os resultados acústicos e perceptivo-auditivos da voz de GI e GII foram comparados e, para o GI, estes resultados foram correlacionados com o desempenho na percepção auditiva. Resultados: Os grupos I e II apresentaram resultados similares, diferenciando-se estatisticamente nos parâmetros variação da frequência fundamental (vF0) e variação da amplitude (vAm) da vogal /a/ e ressonância da fala. Houve correlação negativa entre o desempenho na percepção auditiva com os parâmetros de jitter, vF0 e grau geral da vogal /a/. Conclusão: A qualidade vocal do GI foi semelhante em praticamente todos os parâmetros vocais analisados a dos seus pares ouvintes (G2). A percepção auditiva influenciou os parâmetros jitter, vF0 e grau geral do impacto da voz, em que crianças e adolescentes deficientes auditivos que apresentaram maiores escores para a percepção auditiva também foram capazes de manter a emissão vocal mais equilibrada.

Development and validation of the protocol for the evaluation of voice in patients with hearing impairment (PEV-SHI)

Introduction

The voice of individuals with hearing impairment has been widely described, and can be compromised in all levels of the phonatory system.

Objective

To develop and validate an instrument for evaluating the voice of this population.

Methods

The instrument underwent the validation steps suggested by the Scientific Advisory Committee of the Medical Outcomes Trust. The study sample consisted of seventy-eight Brazilian people with cochlear implants (experimental group) and 78 individuals with normal hearing (control group), divided in groups by age range — children from 3 to 5 years; children from 6 to 10 years and adults from 18 to 46 years. The study sample participated in a voice recording of the sustained vowel /a/, connected speech and spontaneous conversation, in which three voice specialists rated using the proposed instrument. It consists of visual-analog scales of suprasegmental aspects, respiratory-phonatory coordination, resonance, phonation, additional parameters and general vocal perception.

Results

Evaluation by an expert committee and a pilot test established content validity. Reliability measures showed excellent test-retest reproducibility for the majority of the parameters. Analysis with the ROC curve showed that perceptual evaluation with the sustained vowel did not strongly differentiate individuals with cochlear implants from those with normal hearing, and the parameter “speech rate” did not differentiate the groups at all. For the connected speech and spontaneous conversation, the majority of the parameters differentiated the experimental group from the control group with an area under the curve ≥0.7. The cutoff values with maximum specificity and sensitivity were 30.5 for mild, 49.0 for moderate and 69.5 for intense deviation.

Conclusions

The protocol for the evaluation of voice in subjects with hearing impairment, PEV-SHI, is a reliable and useful tool for assessing the particularities of the voice of individuals with hearing impairment treated with cochlear implants and can be used in research and clinical settings to standardize evaluation and facilitate information exchange among services.

Voice symptoms and handicap in adults with cochlear implants

ABSTRACT Purpose: to investigate the presence of vocal symptoms and handicap in adults with cochlear implants, and verify the correlation with their self-perception of the voice quality. Methods: twenty-seven adults of both genders, with cochlear implants, in the age range of 19 to 57 years participated. The participants answered the self-assessment protocols Voice Handicap Index and Voice Symptom Scale. Furthermore, the participants answered an additional question about how they rated their voices. Results: for the Voice Handicap Index, the average score was 28.74, in total, and the average score for the Voice Symptom Scale was 29.22, in total. The correlation between the scores of the Voice Handicap Index and the self-perception of the voice showed that the worse the perception, the more handicap in every domain of the protocol. For the Voice Symptoms Scale, the results showed that there is a positive and moderate correlation between the self-perception of the voice and the total scores as well as for the impairment and emotional subscales. Conclusion: this study verified the presence of handicap and symptoms related to voice, mainly, regarding physical, functional and limitation aspects for the adults with cochlear implants. There is a positive and moderate correlation between the score of the protocols applied and self-evaluation of the vocal quality of the participants.

Prosody perception and production by children with cochlear implants

The perception and production of emotional and linguistic (focus) prosody were compared in children with cochlear implants (CI) and normally hearing (NH) peers. Thirteen CI and thirteen hearing-age-matched school-aged NH children were tested, as baseline, on non-verbal emotion understanding, non-word repetition, and stimulus identification and naming. Main tests were verbal emotion discrimination, verbal focus position discrimination, acted emotion production, and focus production. Productions were evaluated by NH adult Dutch listeners. All scores between groups were comparable, except a lower score for the CI group for non-word repetition. Emotional prosody perception and production scores correlated weakly for CI children but were uncorrelated for NH children. In general, hearing age weakly predicted emotion production but not perception. Non-verbal emotional (but not linguistic) understanding predicted CI children's (but not controls') emotion perception and production. In conclusion, increasing time in sound might facilitate vocal emotional expression, possibly requiring independently maturing emotion perception skills.

The Acoustic Characteristics of the Voice in Cochlear-Implanted Children: A Longitudinal Study

OBJECTIVE

The purpose of this study was to characterize changes in the voice and vowel articulation of prelingually deaf children after cochlear implantation.

METHODS

In this study, the patient group included 30 prelingually deaf children who underwent unilateral cochlear implantation at 4-6 years of age. The control group included normally hearing children of the same age. All deaf children had follow-ups before cochlear implantation and at 1, 3, 6, 12, and 24 months after implantation. The acoustic parameters, aerodynamic parameters, and vowel formants were measured in the patient group and compared with those of the control group.

RESULTS

All acoustic parameters, aerodynamic parameters, and vowel formants differed significantly between normally hearing children and prelingually deaf children. For prelingually deaf children, all of the above parameters gradually decreased after cochlear implantation. Furthermore, the acoustic parameters Jitter and Shimmer were significantly reduced as early as 6 months, whereas the fundamental frequency, the standard deviation of fundamental frequency, estimated subglottal pressure, aF1, iF2, and uF2 were significantly altered 12 months after implantation. However, statistically significant differences in these parameters were not observed between 12 and 24 months after cochlear implantation.

CONCLUSION

After cochlear implantation, prelingually deaf children established auditory feedback and improved voice control and vowel production.

Objective Voice Analysis of Pediatric Cochlear Implant Recipients and Comparison With Hearing Aids Users and Hearing Controls

OBJECTIVES

Phonation is influenced by hearing as a feedback mechanism. The purpose of the present study was to compare selected acoustic parameters in children using cochlear implants (CIs), those using hearing aids (HA), and their normal-hearing (NH) peers.

METHODS

The participants were 15 children using CI (mean age: 72 months), 15 children using HA (mean age: 74 months), and 15 NH children (mean age: 77 months). The vowel /a/ was produced to measure perturbation and mean fundamental frequency. The six Persian vowels in /C_bVC_d/ were obtained to extract vowel duration. Data were analyzed by one-way analysis of variance.

RESULTS

Results revealed a statistically significant difference between the NH group and the HA group regarding fundamental frequency (F_2,51 = 3.443, P < 0.05), jitter local (F_2,51 = 1.629, P < 0.05), jitter local absolute (F_2,51 = 6.519, P < 0.001), jitter rap (F_2,51 = 7.151, P < 0.001), jitter ppq5 (F_2,51 = 5.894, P < 0.001), shimmer local (%) (F_2,51 = 8.070, P < 0.001), shimmer local (dB) (F_2,51 = 3.884, P < 0.05), shimmer apq3 (F_2,51 = 4.926, P < 0.05), shimmer apq5 (F_2,51 = 8.442, P < 0.001), and harmonic-to-noise ratio (F_2,51 = 4.117, P < 0.001). The mean values of the duration of all six vowels were significantly greater in children with CI and HA than in NH children (P < 0.001).

CONCLUSION

It seems that after 8 months of using CI, auditory control of voice production would be enabled. Furthermore, children with hearing impairment potentially regard vowel sound duration as a distinguishing feature, whereas in NH speakers, the duration has the least effect in vowel identification.

The effect of age of cochlear implantation on vocal characteristics in children

Background

Early cochlear implantation aids auditory feedback and supports better communication and self-monitoring of the voice. The objective of this study was to determine whether the age of cochlear implantation has an impact on vocal development in children implanted before age 4.

Method and procedures

The study consisted of 19 participants in total. All implant recipients (experimental group) were 3–5 years post-implantation, including four prelingual (0–2 years) and five perilingual (2–4 years) implant recipients. The control group consisted of 10 children whose hearing was within normal limits between the ages 3–6 years and 10 months, which was compared to the experimental group. Established paediatric norms were used for additional comparison. A questionnaire was used to gather information from each of the participant’s caregivers to determine whether other personal and contextual factors had an impact on voice production. An acoustic analysis was conducted for each participant using the Multi-Dimensional Voice Program of the Computerized Speech Lab.

Results

When the experimental group and the control group were compared, similar results were yielded for fundamental frequency and short-term perturbation (jitter and shimmer). More variability was noted in long-term frequency and amplitude measures, with significantly higher differences, and therefore further outside the norms, in the prelingual group when compared to the perilingual and control groups.

Conclusion

In this study, age of implantation did not impact vocal characteristics. Further research should include larger sample sizes, with participants that are age and gender matched.

Hearing performance and voice acoustics of cochlear implanted children

INTRODUCTION

The voice of hearing-impaired individuals has been described extensively, and exhibits abnormalities in quality, articulation and resonance. Having an understanding of the aspects that may have an impact on voice characteristics of cochlear implant users is important for users and for professionals in this field.

OBJECTIVE

To verify the existence of correlation between age, time of device use, voice detection threshold, hearing category score and language category score with acoustic data of voices of cochlear implanted children.

METHODS

Retrospective study. Fifty-one children ranging in age from 3 years to 5 years and 11 months who unilaterally used cochlear implants participated. Acoustic analysis of the sustained vowel/a/, sequential speech and spontaneous speech was performed. The results were correlated with demographic data and hearing test results.

RESULTS

Children with worse voice detection threshold showed higher frequency in the sustained vowel (p≤0.001) and in the spontaneous speech (p≤0.005).

CONCLUSION

There was a correlation between the voice detection threshold and the frequency values of the sustained vowel and spontaneous speech of the studied population.