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Context-specific expression of conditional freezing. A, Mean ± SEM percentage of freezing during the 1 min interstimulus intervals averaged across all retrieval tests for NO-EXT (filled triangles), EXT (filled circles), and HAB (open squares) rats. The arrowheads indicate the onset of the CSs. B, Ratio of the average (mean ± SEM) percentage of freezing during the INCON tests and the CON tests. A value of 1 (dashed line) indicates equivalent freezing during the CON and INCON tests.
