Fig. 6.

Time-related recognition performance. This graph demonstrates the lack of retention of successfully acquired material in the high performer groups over the time interval from encoding during drug administration to recognition testing, 3-4 h later at the end of the study day. Participants who were more deeply sedated during drug effect (low performers) never encoded the stimuli during drug effect and thus had little change in retention over time. D = dexmedetomidine; P = propofol; Plac = placebo; T = thiopental.