Effects of stimulation rate on modulation detection and speech recognition by cochlear implant users.

Abstract Objective: This study investigated the effect of low to moderate electrical stimulation rates (275, 350, 500 and 900 pps/ch) on modulation detection ability of cochlear implant subjects, and the relationship between modulation detection and speech perception as a function of rate. Design: A...

Descripción completa

Detalles Bibliográficos
Publicado en:International Journal of Audiology Vol. 50; no. 2; pp. 123 - 133
Autores principales: Arora K, Vandali A, Dowell R, Dawson P
Formato: equations & formulas research tables/charts Journal Article
Publicado: Taylor & Francis Ltd Feb2011
Acceso en línea:Ver este registro en EBSCOhost
fields @attributes:
  recordID: 1
pdfLink:
plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104991633&site=ehost-live
header:
  @attributes:
    shortDbName: ccm
    uiTerm: 104991633
    longDbName: CINAHL Complete
    uiTag: AN
  controlInfo:
    bkinfo:
    dissinfo:
    jinfo:
      jid:
        14992027
        JW2
      jtl: International Journal of Audiology
      issn: 14992027
      maglogo: Y
    pubinfo:
      dt: Feb2011
      vid: 50
      iid: 2
      pid: 377
      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
    artinfo:
      ui:
        104991633
        57535354
        10.3109/14992027.2010.527860
        NLM21070121
        104991633
      ppf: 123
      ppct: 10
      formats:
        fmt:
          @attributes:
            type: P
      tig:
        atl: Effects of stimulation rate on modulation detection and speech recognition by cochlear implant users.
      aug:
        au:
          Arora K
          Vandali A
          Dowell R
          Dawson P
        affil: **Department of Otolaryngology, The University of Melbourne, Melbourne, Australia
      sug:
        subj:
          Cochlear Implant
          Speech Perception
          Human
          Experimental Studies
          Acoustics Evaluation
          Electric Stimulation
          Analysis of Covariance
          Analysis of Variance
          Repeated Measures
          Post Hoc Analysis
      ab: Abstract Objective: This study investigated the effect of low to moderate electrical stimulation rates (275, 350, 500 and 900 pps/ch) on modulation detection ability of cochlear implant subjects, and the relationship between modulation detection and speech perception as a function of rate. Design: A repeated ABCD experimental design for the four rate conditions was employed. A sinusoidally amplitude modulated acoustic signal was presented to the audio input of a research processor. Stimuli were presented at an acoustic level that produced electrical levels close to the subjects' most comfortable level (MCL) of stimulation and at an acoustic level 20 dB below this. Study Sample: Ten postlingually deaf adult users of the Nucleus CI24 cochlear implant participated. Results: Acoustic modulation detection thresholds (MDTs), averaged across the subject group, were significantly better for rates of 500 pps/ch compared to the other rates examined for stimuli presented at MCL. In addition, there was a significant relation between speech perception in noise and acoustic MDTs at MCL. Conclusions: The benefits obtained in speech perception and modulation detection as a function of rate were attributed to an increased electrical dynamic range as a function of stimulation rate, at least for rates up to 500 pps/ch. Sumario Objetivo: Este estudio investigóó el efecto de las tasas de estimulacióón elééctrica, leves a moderadas, (275, 350, 500 y 900 pps/canal) sobre la capacidad para detecctar la modulacióón por parte de sujetos con implante coclear y la relacióón entre la deteccióón de la modulacióón y la percepcióón del lenguaje como funcióón de la tasa. Diseñño: Se empleóó un diseñño experimental de ABCD repetido para las cuatro condiciones de tasa. Se presentóó una seññal acúústica de amplitud sinusoidalmente modulada en la entrada de audio de un procesador de investigacióón. Los estíímulos fueron presentados a un nivel acúústico que produjo niveles elééctricos cercanos al nivel de estimulacióón máás confortable (MCL) de los sujetos y a un nivel acúústico 20 dB por debajo de ééste. Muestra Del Estudio: Participaron diez adultos sordos post-lingüüíísticos usuarios de un implante coclear Nucleus CI24. Resultados: Los umbrales acúústicos de deteccióón de la modulacióón (MDT), promediados en todo el grupo de sujetos, fueron significativamente mejores para las tasas de 500 ppps/canal, comparado con las otras tasas examinadas para estíímulos presentados en el MCL. Ademáás, existióó una relacióón significativa entre la percepcióón del lenguaje en ruido y los MDT acúústicos en el MCL. Conclusiones: Los beneficios obtenidos en la percepcióón del lenguaje y la deteccióón de la modulacióón, como funcióón de la tasa, fueron atribuidos a un incremento de los rangos dináámicos elééctricos, como funcióón de la tasa de estimulacióón, al menos para tasas de hasta 500 pps/chanal.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
    refInfo:
    holdings:
      @attributes:
        islocal: N