Evaluation of performance in the cognitive probabilistic learning tasks revealed that cannabis-dependent subjects and controls did not differ in their overall accuracy in the training phase (t = 0.15, p = 0.88) or during the testing session for reaction time (t = 0.075, p = 0.94). There was also no significant group difference for accuracy on either Choose A or Avoid B pairs (t = 0.066, p = 0.95, and t = 0.28, p = 0.78, respectively). On the stop-signal Go/NoGo task, the two groups also showed similar overall accuracy (t = 0.22, p = 0.83) and their SSRT did not differ significantly (t = 1.23, p = 0.22).
