Fig. 1.

(A) Box plots depicting time to lapse in the fixed reward and de-escalating version of the paradigm. The horizontal line in the middle of each box represents the median value, whereas the bottom and top borders represent the 25^th and 75^th percentile values respectively. There were no significant differences in mean time to lapse (t(15) = 0.26, p = 0.80) or in the proportion of individuals who lapsed (Fisher's Exact Test p = 0.64) between paradigm versions. (B) Kaplan-Meier curves demonstrating that the rate of lapse was not significantly different by paradigm version (log-rank Χ² = 0.07, p = 0.79).