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Mean plasma corticosterone levels (μg/dl + 1 standard error of the mean) measured immediately following 30 min, 95-dBA loud noise (testing +), or quiet chamber (testing −) exposure test (48 hrs interval), in rats previously treated with ACSF (grey bars) or muscimol (black bars) and exposed to loud noise (training +) or quiet chambers (training -). *statistically different from ACSF-injected group repeatedly exposed to loud noise, p = 0.003.
