Fig. 5.

Selected behaviors observed every 30 s during 2-min periods both before and after discrimination sessions, prior to (day 0–control), and after morphine discontinuation. Each data point represents the average (±SEM) number of times that a sign was observed (maximum possible score=8). For clarity, each point summarizes data over 3 days for each monkey (±SEM). Abscissa: days since last injection. See Fig. 2 for other details