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Rats were trained in a two-lever situation. Conventional free operant avoidance was programmed on one lever; on the other, time-out could be produced on a fixed-interval schedule. When the stimulus paired with time-out could be produced on a second-order schedule on the time-out lever, it maintained responding if time-out was conditional on its production, but not otherwise. The time-out stimulus was shown to have no intrinsic reinforcing properties.

Secondary reinforcement based upon time out from avoidance