Effects of Lysergic Acid Diethylamide upon Performance of Trained Rats

Abstract
A syndrome resulting from intraperitoneal injection of lysergic acid diethylamide (LSD) in rats is described. In rats trained to climb a rope, LSD produces signs of confusion and markedly prolongs climbing time. This effect on climbing time can be objectively and quantitatively measured, and is linearly related to the log dose of LSD. Effects of LSD could be partially antagonized by serotonin or by 5-hydroxy tryptophane given intraperitoneally. [alpha]-4(Piperidyl) benzhydrol did not affect the action of LSD, while reserpine intensified and prolonged the LSD-syndrome.