Objectives: To conduct critical assessment of the literature on the effects of cochlear implantation on adults' cognitive abilities.
Design: PubMed, Scopus, Lilacs, Web of Science, Livivo, Cochrane, Embase, PsycInfo, and grey literature were searched. Eligibility criteria: age 18 or over with severe-to-profound bilateral hearing loss, cochlear implantation, cognitive test before and after implantation. Risk of bias was assessed using ROB, ROBINS-I and MASTARI tools. Meta-analysis was performed.
Study Sample: Out of 1830 studies, 16 met the inclusion criteria.
Results: On AlaCog test, significant improvement was found after implantation [MD = -46.64; CI95% = -69.96 to -23.33; = 71%]. No significant differences were found on the Flanker, Recall, Trail A and n-back tests ( > 0.05). For MMSE, no significance was found [MD 0.63; CI 95% = -2.19 to 3.45; = 88%]. On TMT, an overall significant effect with a 9-second decrease in processing speed post-implantation [MD = -9.43; CI95% = -15.42 to -3.44; = 0%].
Conclusion: Cognitive improvements after cochlear implantation may depend on time and the cognitive task evaluated. Well-designed studies with longer follow-up are necessary to examine whether cochlear implantation has a positive influence on cognitive abilities. Development of cognitive assessment tools to hearing-impaired individuals is needed.
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