Figure 2
The mediation model demonstrates that the relationship between photoperiod and anhedonia in females was mediated by whole brainstem (a), midbrain (b), pons (c) and medulla (d) and the relationship between photoperiod and low mood was meditated by whole brainstem (e), pons (g) and medulla (h), while the relationship between photoperiod and low mood was not meditated by midbrain (f). Standardized beta values are shown on the model paths. a and b included in the model show the direct effects of the relationship between photoperiod and depressive symptoms. c and c’ show the total and the indirect effects of the relationship between photoperiod and anhedonia as well as low mood without and with the mediators respectively. *p < 0.05, **p < 0.001.
