Fmr1^CB-0950-3/Fmr1^CB-0950-3 mutants exhibit significantly decreased learning performance in an aversive conditioning assay, and exhibit severe defects in a reversal-learning paradigm, with a third-odor preference assay showing an inability to forget the first aversive odor association after training with a second aversive odor, and interference-induced forgetting is blocked in these mutants, as compared to wild type.