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Average response topographies for the unconditioned response during the first 20 trials of the pretest (Pretest, dotted black line) and first post-test (Post1, solid black line) following delay conditioning and before drug treatment for groups receiving saline or fluoxetine (0.03, 0.3, 3.0 mg/kg). Topographies are shown at the five unconditioned stimulus intensities (2.0, 1.0, 0.5, 0.25, 0.1 mA).
