Diminished hedonic capacity in social activities as a mediator of the link between dysfunctional behavioral activation system and depressive symptoms.

"Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest."

"The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This study was supported by grants from the Natural Science Foundation of Shanghai [21ZR1421000], the National Natural Science Foundation of China [32171084], The Changning Youth Nursing Personnel Development Program of the Health and Health Commission [20214Q011], Research grant of Changning Health Committee [20214Y028] and Research grant of Changning Mental Health Center [202109; 2022Y04]. These funding agents had no role in the study design; collection, analysis, and interpretation of the data; or writing of the manuscript."