Subanesthetic effects of the noncompetitive NMDA antagonist, ketamine, in humans. Psychotomimetic, perceptual, cognitive, and neuroendocrine responses. - Krystal,J.H.; Karper,L.P.; Seibyl,J.P.; Freeman,G.K.; Delaney,R.; Bremner,J.D.; Heninger,G.R.; Bowers Jr,M.B.; Charney,D.S. (Arch Gen Psychiatry, 1994)