Abstract
Musical rehabilitation has been used in clinical and nonclinical contexts to improve postimplantation auditory processing in implanted individuals. This systematic review aimed to evaluate the efficacy of music rehabilitation in controlled experimental and quasi-experimental studies on cochlear implant (CI) user speech and music perception. PubMed/MEDLINE, EMBASE, Web of Science, PsycARTICLES, and PsycINFO databases through July 2022. Controlled experimental trials and prospective studies were included if they compared pretest and posttest data and excluded hearing aid-only users. Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were then used to extract data from 11 included studies with a total of 206 pediatric and adult participants. Interventions included group music therapy, melodic contour identification training, auditory-motor instruction, or structured digital music training. Studies used heterogeneous outcome measures evaluating speech and music perception. Risk of bias was assessed using the National Heart, Lung, and Blood Institute Quality Assessment Tool. A total of 735 studies were screened, and 11 met the inclusion criteria. Six trials reported both speech and music outcomes, whereas five reported only music perception outcomes after the intervention relative to control. For music perception outcomes, significant findings included improvements in melodic contour identification (five studies, p < 0.05), timbre recognition (three studies, p < 0.05), and song appraisal (three studies, p < 0.05) in their respective trials. For speech prosody outcomes, only vocal emotion identification demonstrated significant improvements (two studies, p < 0.05). Music rehabilitation improves performance on multiple measures of music perception, as well as tone-based characteristics of speech (i.e., emotional prosody). This suggests that rehabilitation may facilitate improvements in the discrimination of spectrally complex signals.
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