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Percentage of freezing (mean ± SEM) during conditioning (cond), extinction (ext), and retention testing (test) in Long-Evans rats. Rats were divided into two groups for which contextual fear was either high (SHOCK) or low (NO-SHOCK) prior to extinction training. Prior to conditioning, rats received either infralimbic (IL) cortical lesions or sham surgery (SH-E). IL lesions did not produce an extinction recall impairment under either condition.
