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A behavioral testing method was demonstrated to be applicable to the study of detrimental drug effects on complex behavior in rats. The method required the subject (S) to respond in a certain sequence to four identical response sites spaced 90° apart within a cylindrical test compartment. After each S was shaped to perform its one particular sequence within this quadrilaterally symmetrical environment, and its performance was brought to a stable level, drug effects were then studied on a battery of such Ss whose sequential response habits were representative of a continuum of sequence complexity. Experiments with a drug which induces hallucinatory and confusional states in man showed that the method yields in the rat quantitative measures of detrimental behavioral effects in terms of dose‐response and dose‐time relationships in addition to providing an estimate of the interactive effect between drug dose and behavioral complexity. It was found that for a given magnitude of behavioral detriment, drug dose and behavioral complexity of sequence were inversely related. That is, a S required to perform a simple sequence needed a larger drug dose to interfere with its habit a unit amount than did a S with a more complex one; or, expressed another way, a given drug dose had a greater behavioral effect the more complex the sequence. Finally, an empirical ranking of response sequences along a functional behavioral complexity dimension was presented.

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A system designed for use in complex operant conditioning experiments is described. Some of its key features are: (a) plugboards that permit the experimenter to change either from one program to another or from one analysis to another in less than a minute, (b) timesharing of permanently‐wired, electronic logic components, (c) recordings suitable for automatic analyses. Included are flow diagrams of the system and sample logic diagrams for programming experiments and for analyzing data.

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A technique is presented utilizing a titration schedule to measure performance decrement as a function of continuing heavy muscular exertion. A treadmill is equipped with a reversible motor controlling the velocity control of the treadmill itself. This provides a constant acceleration of the treadmill unless a subject‐controlled, spring loaded switch is depressed. If this switch is depressed, the treadmill decelerates at a constant rate. A subject is instructed to walk at maximum rate at all times, controlling the velocity of the treadmill with the switch. A performance record is obtained from a tachometer‐generator on the treadmill delivering current to a recorder.

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