The forest plot of the random-effects meta-analysis on the mean DURATION of performance on the last vs. the first mCST trial (A) and after vs. before the session break on all experimental days (B). Positive effect sizes (Hedges' g represented as boxes on the plot) indicate a slower while negative effect sizes indicate a faster duration of performance on the last vs. the first mCST trial or after vs. before the break. The 95%C.I. of some effect sizes (the horizontal lines through the boxes) overlapped with zero. The mean weighted effect sizes g (the centre of each diamond in A and B) were medium (A) and small (B) and their 95%C.I. (the edges of the diamonds) did not overlap with zero. Therefore, the mean overall effect sizes show that participants performed the task faster in the long-term (last vs. first mCST trial; A) and short-term (after vs. before the break within each session; B). The relative weights indicate that the study 2 in A and B had the highest contribution to the computation of the mean weighted effect sizes.