Speech Recognition and Cognitive Skills in Bimodal Cochlear Implant Users

Author:

Hua Håkan12,Johansson Björn3,Magnusson Lennart3,Lyxell Björn12,Ellis Rachel J.12

Affiliation:

1. Linnaeus Centre HEAD, Swedish Institute for Disability Research, Linköping, Sweden

2. Department of Behavioural Sciences and Learning, Linköping University, Sweden

3. Department of Audiology, Sahlgrenska University Hospital, Gothenburg, Sweden

Abstract

Purpose To examine the relation between speech recognition and cognitive skills in bimodal cochlear implant (CI) and hearing aid users. Method Seventeen bimodal CI users (28–74 years) were recruited to the study. Speech recognition tests were carried out in quiet and in noise. The cognitive tests employed included the Reading Span Test and the Trail Making Test (Daneman & Carpenter, 1980; Reitan, 1958, 1992), measuring working memory capacity and processing speed and executive functioning, respectively. Data were analyzed using paired-sample t tests, Pearson correlations, and partial correlations controlling for age. Results The results indicate that performance on some cognitive tests predicts speech recognition and that bimodal listening generates a significant improvement in speech in quiet compared to unilateral CI listening. However, the current results also suggest that bimodal listening requires different cognitive skills than does unimodal CI listening. This is likely to relate to the relative difficulty of having to integrate 2 different signals and then map the integrated signal to representations stored in the long-term memory. Conclusions Even though participants obtained speech recognition benefit from bimodal listening, the results suggest that processing bimodal stimuli involves different cognitive skills than does unimodal conditions in quiet. Thus, clinically, it is important to consider this when assessing treatment outcomes.

Publisher

American Speech Language Hearing Association

Subject

Speech and Hearing,Linguistics and Language,Language and Linguistics

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