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The strength of contextual fear memories acquired with two or five footshocks (FS). A: Schematic of the experimental design. Separate groups of rats received 2FS or 5FS. Two days after training, they received extinction sessions. At the end of the extinction session, rats trained with 5FS had significantly more freezing (B). *P < 0.05, *P < 0.01 as compared with weak training at the same test.
