Fig. 5.  Drug effect on the recognition of previously encoded material. Subjects learned two lists of 16 words before receiving drug: a primary list was strongly learned through four repetitions, and a secondary list more weakly learned through only a single repetition. Later, during the drug infusion, subjects performed forced-choice tasks to test recognition of the learned words. (A ) The results for probed recognition of the primary list, and (B ) the results for the secondary list. One-way analysis of variance was performed on each of the four-word list:drug level combinations to evaluate the effect of drug. There was no significant effect of any drug on the recognition of either strongly or weakly learned words. Error bars  represent SEM. DEX = dexmedetomidine; MIDAZ = midazolam; PLAC = placebo; PROP = propofol; THP = thiopental.