Fig. 3
Mediation results. (A) and (B) show the mediating effect of FC between ACC and right superior LOC, and (C) and (D) show the mediating effect of FC between left SMG and left putamen. In (A) and (C), depressive symptoms (CDI-2: SR total score) is the causal variable (X) and smartphone overuse (SM-scale) is the outcome variable (Y); the opposite is shown in (B) and (D). FC was included as a mediator (M) in all. Path a: X-M relationship; path b: M-Y relationship after adjusting for X; path ab: indirect effect of X on Y through M; path c’: direct effect of the X-Y relationship controlling for M; and path c: combined total direct and indirect effect. ACC: anterior cingulate cortex, R.sLOC: right superior lateral occipital cortex, L.SMG: left supramarginal gyrus, L.PUT: left putamen. *** p < .001, ** p < .01, * p < .05.
