Accuracy (i.e., percentage of trials with a correct nonmatching response) after treatment with vehicle, a FAAH inhibitor (URB597, URB694, AM3506, PF-04457845, or ARN14633) or an MGL inhibitor (JZL184). Data represent mean (± s.e.m.) accuracy as a function of dose and delay value. Dashed lines in all figures indicate the expected level if responses were completely random (i.e., chance level). Points outside the gray bands have Bonferroni-corrected 95% confidence intervals that do not include 50%.