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Two conditioned lick suppression experiments with rats used feature-negative training (A-footshock trials intermixed with nonreinforced XA presentations) to analyze the role of the number of XA compound presentations and the temporal relationship of the elements within the compound (simultaneous or serial) as determinants of the resulting behavioral control. Second-order conditioning (i.e., excitatory behavioral control by X) was observed to decline as the number of XA compound trials was increased. This decline was more rapid if X and A were presented simultaneously, as opposed to serially (i.e., X before A; Experiment 1). Conditioned inhibition to X, as assessed by a summation test (Experiment 1) and a retardation test (Experiment 2), increased with the number of XA trials and did so more quickly for simultaneous than for serial pairings of X and A. The results help to clarify previously discrepant findings regarding factors that promote excitation versus inhibition with this protocol.

Trial number and compound stimuli temporal relationship as joint determinants of second-order conditioning and conditioned inhibition