Atypical cortical responses underlie poor speech perception in children using cochlear implants

Gordon, Karen A.; Tanaka, Sho; Papsin, Blake C.

doi:10.1097/00001756-200512190-00015

Cited by 50 publications

(38 citation statements)

References 23 publications

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“…In those studies, the time of device use and aspects related to the family and auditory rehabilitation are shown to have an impact on the benefits obtained through cochlear implants (24)(25)(26)(27) . Previous studies have described the correlation between the P1 component and an individual's performance in tests of auditory abilities, characterizing this component as a predictor of the development of speech auditory perception (16)(17)(18)28,29) . In this study, there was significant improvement in the individuals' auditory abilities with the use of cochlear implants, assessed through the IT-MAIS questionnaire (Table 3), but no significant correlation with the latency and amplitude of the P1 component (Table 4).…”

Section: Discussionmentioning

confidence: 99%

“…Children who receive cochlear implants after the sensitive period can present abnormal cortical auditory responses, even after many years of auditory stimulation (9,14,15) . Moreover, individuals with poorer speech perception present atypical records concerning these potentials (16)(17)(18) , thus reflecting abnormal or immature patterns in cortical activity (16) . Therefore, by studying the maturational process of the auditory system, with a focus on CAEP in children who received cochlear implants, it is possible to obtain important information that can aid in understanding the differences in the speech perception development observed among users of cochlear implants, and, consequently, reflect upon the process of referring individuals to this implantation, especially with regard to a child's age at the time of the procedure.…”

Section: Introductionmentioning

confidence: 99%

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Identification of risk groups for oropharyngeal dysphagia in hospitalized patients in a university hospital

Bassi

Furkim

Silva

et al. 2014

CoDAS

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Purpose: To identify risk groups for oropharyngeal dysphagia in hospitalized patients in a university hospital. Methods: The study was design as an exploratory cross-sectional with quantitative data analysis. The researched population consisted of 32 patients admitted to the medical clinic at the university hospital. Patient history data were collected, followed by a universal swallowing screening which included functional feeding assessment, to observe clinical signs and symptoms of dysphagia, and assessment of nutritional status through anthropometric data and laboratory tests. Results: Of the total sample, the majority of patients was male over 60 years. The most common comorbidities related to patients with signs and symptoms of dysphagia were chronic obstructive pulmonary disease, systemic arterial hypertension, congestive heart failure, diabetes mellitus and acute myocardial infarction. The food consistency that showed higher presence of clinical signs of aspiration was pudding and the predominant sign was wet voice. Conclusion: There is a high incidence of risk for oropharyngeal dysphagia in hospitalized patients and an even higher rate of hospitalized patients with nutritional deficits or already malnourished. Hospitalized patients with respiratory diseases, chronic obstructive pulmonary disease, congestive heart failure and patients with xerostomia were indicated as risk group for oropharyngeal dysphagia.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of risk groups for oropharyngeal dysphagia in hospitalized patients in a university hospital

Bassi

Furkim

Silva

et al. 2014

CoDAS

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“…It is imperative to note that, the N1-P2 CAEP is not without imperfections and limitations (most important is its inapplicability to infants), but it is a valuable component of the audiologist's toolbox. Its success in hearing threshold estimation lies in the use of appropriate test parameters, efficient procedure, and rigorous interpretation [12]. Hence, a judicious application of this advanced technological research tool is necessary for optimal evaluation of suspected cases of central auditory processing disorder and for objective evaluation of Cochlear implant candidacy and long term outcomes with cochlear implantation.…”

Section: Discussionmentioning

confidence: 99%

A Clinical Study of Cortical Auditory Evoked Potentials in Cochlear Implantees

Hossain

Raghunandhan

Kameswaran

et al. 2012

Indian J Otolaryngol Head Neck Surg

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Normal maturation of central auditory pathways is a precondition for the optimal development of speech and language skills in children. The temporal cortex gets acoustically tagged due to auditory stimulation and important changes occur in the higher auditory centers due to hearing loss of any type and degree. Cochlear implantation increases auditory sensitivity by direct electrical activation of auditory nerve fibers, enabling phonemic awareness, discrimination and identification ultimately yielding speech understanding. Early implantation stimulates a brain that has not been re-organized and will therefore be more receptive to auditory input and greater auditory capacity. Cortical potentials have enabled us to objectively study this phenomenon. To assess the outcomes of Cochlear implants on the auditory cortex by analyzing cortical auditory evoked potentials (CAEPs) in the habilitation period. This prospective clinical study was performed in 30 pre-lingual candidates with varied etiology of deafness who underwent cochlear implantation at our institute over the last 1 year. The study group had two cohorts (group-1: 0-8 years and group-2: 8-15 years) which included candidates with normal inner ear and no syndromes or handicaps. All implantees in the study group underwent CAEP testing at 6 months and 1 year post-implantation and comparison of the CAEP wave parameters (P1 amplitude, P1 latency and P1 morphology) were done between the two cohorts. In children Implanted early (group-1) there was an early onset rapid increase in P1 amplitude along with a decrease in P1 latency during the follow-up period. Significant change in the CAEP wave morphology was also notable in group-1 unlike in group-2. Candidates who experienced less than 3 years of auditory deprivation before implantation showed P1 latencies, which fell into the range of normal children within 6 months of habilitation. Children with more than 6 years of auditory deprivation, however, generally did not develop normal P1 latencies or morphology even after 1 year of habilitation. The overall outcome with CAEP was much better in group-1 as compared to group-2 and the observations were is in comparison with the existing world literature. The advent of CAEP has objectively proved beyond doubt that there is a critical age for stimulating the auditory brain via cochlear implantation. There is considerable evidence for a developmental sensitive period, during which the auditory cortex is highly plastic. If sensory input is deprived to the auditory system during this sensitive period, then the central auditory system is susceptible to large scale reorganization. Restoring input to the auditory system by Cochlear Implant at an early age can provide the stimulation necessary to preserve the auditory pathways. However, if auditory input is not restored until after this developmental period, then the cross-modal reorganized pathways may exhibits abnormal functional characteristics as observed in recorded P1 amplitude, latencies and morphologies of CAEPs.

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“…Desde que Davis (1939) descreveu que a percepção do som pode alterar o eletroencefalograma do humano ouvinte, e que estas modificações podem ser extraídas deste registro, inúmeros pesquisadores têm utilizado os potenciais evocados auditivos (PEA) para descrever a resposta do sistema auditivo frente à estimulação (SHALLOP, 1993;GROENEN et al, 1996;EGGERMONT et al, 1997;KILENY et al, 1997;OKUSA et al, 1999;SHARMA et al, 2002;PANTEV et al, 2002;BEYNON et al, 2002;SHARMA et al, 2004;SINGH et al, 2004;GILLEY et al, 2005;SHARMA et al, 2005;KELLY et al, 2005;ROMAN et al, 2005;GORDON et al, 2005;BAUER et al, 2006;DORMAN et al, 2007;GIRAUD et al, 2007;MCNEILL et al, 2007;KRAL & EGGERMONT, 2007;GILLEY et al, 2008;BROWN et al, 2008;KURNAZ et al, 2009;MCNEILL et al, 2009;MARIAM et al, 2009;JOHNSON, 2009;FRIESEN et al, 2009;HANCOCK et al, 2010;KRAL & SHARMA, 2011;ZHANG et al, 2011;CASTAÑEDA-VILLA et al, 2012).…”

Section: Lista De Ilustraçõesunclassified

“…Dentro deste contexto, estudos foram realizados durante os primeiros anos de uso do IC, e demonstraram a correlação negativa da latência e amplitude dos PEAC com o desempenho da percepção da fala nas crianças usuárias de IC (BEYNON et al, 2002;MAURER et al, 2002;SHARMA et al, 2004;GORDON et al, 2005;KELLY et al, 2005;ROMAN et al, 2005;MCNEILL et al, 2007;KURNAZ et al, 2009;MCNEILL et al, 2009).…”

Section: Lista De Ilustraçõesunclassified

Caracterização dos potenciais evocados auditivos corticais em indivíduos com longo tempo de uso do implante coclear

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Atypical cortical responses underlie poor speech perception in children using cochlear implants

Cited by 50 publications

References 23 publications

Identification of risk groups for oropharyngeal dysphagia in hospitalized patients in a university hospital

Identification of risk groups for oropharyngeal dysphagia in hospitalized patients in a university hospital

A Clinical Study of Cortical Auditory Evoked Potentials in Cochlear Implantees

Caracterização dos potenciais evocados auditivos corticais em indivíduos com longo tempo de uso do implante coclear

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