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1 Department of Physiology and Pharmacology, Duke University, Durham, North Carolina
Siamese fighting fish (Betta splendens) were subjected to a controlled stress situation involving hypoxia. LSD depressed the intensity of activity under these conditions, whereas serotonin increased it. LSD and serotonin, however, had the same effect in reducing the duration of almost continuous activity. When the two drugs were added together, serotonin potentiated the effect of LSD on intensity and increased its effect on duration.
Evidence is also presented suggesting that LSD produced perceptual or mood changes in Betta.
Submitted on May 6, 1957