Differential effects of phencyclidine and MDA on complex operant behavior in monkeys.
Pharmacology, biochemistry, and behavior September 1984 D M Thompson, J M Moerschbaecher
In one component of a multiple schedule, patas monkeys acquired a different four-response chain each session by responding sequentially on three keys in the presence of four geometric forms (learning). In the other component, the four-response chain was the same each session (performance). The response chain in each component was maintained by food presentation under a fixed-ratio schedule....