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Lysergic acid diethylamide (LSD) impaired fear recognition on the Face Emotion Recognition Task. LSD also impaired the decoding of sad faces (significant main effect of drug), but the effects did not reach statistical significance in the individual dose groups. The data are expressed as mean±SEM in 22 and 16 subjects in the 100 and 200 μg LSD dose groups, respectively. *p<0.05, **p<0.01, significant difference from placebo.
