Figure 1.

Schematic figure of the hypothesized autoregressive, cross-lagged models. Thick paths with arrows in one direction, such as a (PDS_t → WAI_t+1; t refers to the respective treatment session and t+1 to 2 sessions later) and b (WAI_t → PDS_t+1) indicate cross-lagged effects, paths c (WAI_t → WAI_t+1) and d (PDS_t → PDS_t+1), indicate autoregressive effects; thin paths with arrows in both directions represent correlations at the same session (PDS_t ↔ WAI_t).