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Individual variation in fear extinction learning. (a) Extinction learning is attenuated in mice with the BNDF Met (M) allele relative to nonMet allele (V) carriers as measured by less change in freezing behavior with repeated presentation of the conditioned stimulus alone during extinction trials. (b) This finding is paralleled in the human as measured by less change in galvanic skin response. Reproduced with permission from Reference 39.
