The results of Experiments 1A–C indicate that renewal of conditioned taste aversion occurs upon return to the conditioning context. However, another possibility is that the change of context unconditionally disturbed fluid intakes in general.Although we cannot completely reject this possibility, it seems quite unlikely, at least in Experiment 1C, for the following reasons. First, both contexts were equally familiar to the rats as each context had been presented once a day throughout the experiment. Thus, disinhibition of the extinguished aversion by the changed context must have been minimal. Second, as reported above, the context change between the last extinction day and the test day did not affect the amount of tap water intake in the afternoon session. Namely, the suppressive effect was specific to the target taste solution.
Experiments 1A–C have demonstrated that renewal of the taste aversion occurs not only after the constant extinction treatment, but also following the graded extinction treatment. Furthermore, according to visual inspection of the averagedata shown in Figs. 1–3, the magnitude of renewal was nominally larger in rats treated in the graded extinction paradigm thanin the constant extinction rats. In addition, separate 2 (context) × 2 (day) ANOVAs yielded a significant interaction only for thegraded extinction rats in all of the experiments reported. This claim, however, needs further empirical substantiation, because the triple interaction of 2 (extinction procedure) × 2 (context) × 2 (day) factors was not significant in any of experiments.
It should be pointed out that the two extinction procedures in the present study included an aspect of counterconditioning,because rats were motivated and allowed to drink fluid from the bottles in the extinction phase. Furthermore, rats that underwent graded extinction were given a compound solution of target NaCl and favorable sucrose in the initial days of extinction. Accordingly, the renewal effects observed here, especially in the graded extinction rats, might have been considered as renewal of responding eliminated by counterconditioning upon return to the acquisition context
The results of Experiments 1A–C indicate that renewal of conditioned taste aversion occurs upon return to the conditioning context. However, another possibility is that the change of context unconditionally disturbed fluid intakes in general.Although we cannot completely reject this possibility, it seems quite unlikely, at least in Experiment 1C, for the following reasons. First, both contexts were equally familiar to the rats as each context had been presented once a day throughout the experiment. Thus, disinhibition of the extinguished aversion by the changed context must have been minimal. Second, as reported above, the context change between the last extinction day and the test day did not affect the amount of tap water intake in the afternoon session. Namely, the suppressive effect was specific to the target taste solution.Experiments 1A–C have demonstrated that renewal of the taste aversion occurs not only after the constant extinction treatment, but also following the graded extinction treatment. Furthermore, according to visual inspection of the averagedata shown in Figs. 1–3, the magnitude of renewal was nominally larger in rats treated in the graded extinction paradigm thanin the constant extinction rats. In addition, separate 2 (context) × 2 (day) ANOVAs yielded a significant interaction only for thegraded extinction rats in all of the experiments reported. This claim, however, needs further empirical substantiation, because the triple interaction of 2 (extinction procedure) × 2 (context) × 2 (day) factors was not significant in any of experiments.It should be pointed out that the two extinction procedures in the present study included an aspect of counterconditioning,because rats were motivated and allowed to drink fluid from the bottles in the extinction phase. Furthermore, rats that underwent graded extinction were given a compound solution of target NaCl and favorable sucrose in the initial days of extinction. Accordingly, the renewal effects observed here, especially in the graded extinction rats, might have been considered as renewal of responding eliminated by counterconditioning upon return to the acquisition context
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