AUTHOR=Zhou Sumei , Deng Tianfang , Shao Shirong , Zeng Zhi TITLE=The multiple mediating roles of depression and grandchild care in the relationship between social participation and cognitive function among middle-aged and elderly Chinese: an empirical study based on CHARLS 2020 data JOURNAL=Frontiers in Aging Neuroscience VOLUME=Volume 17 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/aging-neuroscience/articles/10.3389/fnagi.2025.1549615 DOI=10.3389/fnagi.2025.1549615 ISSN=1663-4365