Interestingly, we also observed a strong trend towards a correlation between the WCST perseverative errors T score and object perseveration ( r = −0.35, p = 0.05) and mean time spent with objects ( r = −0.39, p = 0.03), indicating that perseveration on the WCST is likely associated with perseveration in the hBPM.
Subsequent univariate ANOVAs revealed that MA-dependent participants exhibited an increase in total object interactions [ F (1,32) = 11.8, p < 0.01], time spent with objects [ F (1,32) = 11.0, p < 0.01], percent perseverative interactions [ F (1,32) = 15.9, p < 0.001], and showed a trend towards elevated object-proximal sector entries [ F (1,32) = 3.8, p = 0.057] compared to the drug-free comparison group as illustrated in Fig. 1 .