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Mean freezing of the groups during extinction (left) and testing (middle) of Experiment 2B. The renewal test is shown at right. DCS = d-cycloserine. Experiment 2B was the same as Experiment 2A except that the 2-trial extinction group originally received conditioning with a weaker shock in order to produce a similar level of freezing during testing in Contexts B and C. Note: because the crucial comparisons are within-subject, standard error bars are not shown.
