Endogenous opiates: 1997

This paper is the twentieth installment of our annual review of research co ncerning the opiate system. It summarizes papers published during 1997 that studied the behavioral effects of the opiate peptides and antagonists, exc luding the purely analgesic effects, although stress-induced analgesia is i ncluded. The specific topics covered this year include stress; tolerance an d dependence; eating and drinking; alcohol; gastrointestinal, renal, and he patic function; mental illness and mood; learning, memory, and reward; card iovascular responses; respiration and thermoregulation; seizures and other neurologic disorders; electrical-related activity; general activity and loc omotion; sex, pregnancy, and development; immunologic responses; and other behaviors. (C) 1998 Elsevier Science Inc.