The Efficacy of Cognitive-Communicative Intervention in Subjective Cognitive Decline: A Systematic Review and Meta-Analysis

Purpose: Subjective cognitive decline (SCD) is a risk factor for mild cognitive impairment and Alzheimer’s disease, highlighting the need for identifying and ranking effective cognitivecommunication interventions.Methods: Databases were searched since 2005 to identify randomized controlled trials evaluating interventions for SCD. I reviewed systematically twenty researches and proposed the evidence based data, including their effect sizes using a meta-analysis method. Outcome measures included the domains of 12 cognitions and three communications.Results: The main findings were as follows. Firstly, intervention programs were designed diversely in a session or mode. Their main domains were general cognition, memory, language, etc. Secondly, the average effect size of cognitive-communication interventions was significant. Thirdly, most cognitive domains like processing speed, memory, working memory, and executive function were very effective and significant in the results of treatment. Lastly, naming and comprehension in communication had the significant effect sizes.Conclusion: These results provide evidence-based information to support cognitive-communication intervention for individuals with SCD. Given this, it is possible to facilitate the preventive interventions for SCD in clinical settings, warranting further research into effective elements of their approaches.