Abstract
Aversive thresholds were measured in five cats by means of the methods of titration and constant stimuli, using two intertrial intervals (15 and 3 sec). The data show that at the 3-sec intertrial interval, the aversive thresholds are significantly higher than those for the 15-sec intertrial interval only for the method of constant stimuli and not for titration. There was a significant Method by Intertrial Interval interaction effect. The results are interpreted in terms of the combined effects of conditional aversiveness and magnitude of reinforcement (duration of time-out from shock) and the differential sensitivity of the two methods to these variables.
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