THE EFFECTS OF DOUBLE-ALTERNATION SCHEDULES OF SHOCK INTENSITY UPON PATTERNING OF SUPPRESSION OF LICKING IN RATS WITH SPECIAL REFERENCE TO CUE-UTILIZATION

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Thirsty rats were run in a water-drinking situation in which brief shocks of two different intensities were given with a fixed-time 40-sec schedule and in a double-alternation (DA) pattern of shock intensity, without any signal in Experiment I and with two different kinds of signal during the shock-shock interval in Experiment II. The three groups in Experiment II differed regarding the relationship of the signal with shock intensities. In Group SA, tone and light were presented in single-alternation and in Group R they were presented in a random order. In all the above groups there was no evidence of DA patterning of the suppression in licking to correspond with the variation in shock intensity. Only in Group DA, in which the two modalities of signal corresponded with the two respective shock intensities, was a DA patterning of suppression observed. There was clear evidence in all groups that the strong shock had an immediate burst-inducing function. In Experiment III the possibility that rats would predict forthcoming events on the basis of shock-cues was pursued but the results turned out to be negative.
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