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This manual is dedicated to my late father. Arthur Snapper Sr. Who provided both moral and financial support to all of my efforts.

one recommended by Siegel et al (1971). FOe AL programs are then written to analyze the sorted data in the primary data files on magnetic tape. The results may be stored in files on magnetic tape, printed on the Teletype, or displayed on the oscilloscope. REFERENCES Dyckman, H. L., & Church. R. M. The TIICIE system for interactive control of independent experiments. Computers in the psychology laboratory.

The probabilities of aversive stimulus presentation given the occurrence or the nonocurrence of a lever-press response were manipulated independently. These manipulations generated a variety of schedules of uncued aversive stimulation. Ten rhesus monkeys were divided into 5 groups, each group receiving a different sequence of the 2 probabilities and thereby a different sequence of electric shock presentation schedules ranging between avoidance and punishment. The schedules generated in this manner provided systematic control both of the amount of response facilitation that occurred when response-produced shocks were first introduced following avoidance training and of the postfacilitation response rate decline. Additionally, when the probability of shock presentation following a response was less than that for not responding, scalloped response patterns occurred; when the relative shock probabilities were reversed, bipeak response patterns were observed.

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