Abstract
After extensive training on a variable cycle 15-s schedule of shock avoidance, rats were exposed to shock intensity variations from 0.1 to 0.8 mA. In addition, prior to each session rats received injections of a moderate dose of the opiate antagonist, naloxone (3 mg/kg), or saline vehicle. Response rates and percentage of shocks avoided increased with increasing shock intensity for all three rats. At the high shock intensities naloxone depressed response rates and percentage of avoidance. This naloxone-induced impairment of avoidance was particularly evident in the latter part of the 1-hr sessions. However, at the lower shock intensities, naloxone had no effect for two animals and appeared to increase performance in the third rat. Effects of naloxone on variable-cycle avoidance thus depended on the programmed shock intensity.
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AMIR, S., & AMIT, Z. (1978). Endogenous opioid ligands may mediate stress-induced changes in the affective properties of pain related behavior in rats. Life Sciences, 23, 1143–1152.
BOLLES, R. C., & FANSELOW, M. S. (1982). Endorphins and behavior. Annual Review of Psychology, 33, 87–101.
BUCHSBAUM, M. S., DAVIS, G. C., Naber, D., & PICKAR, D. (1983). Pain enhances naloxone-induced hyperalgesia in humans as assessed by somatosensory evoked potentials. Psychopharmacology, 103, 99–103.
DEWAARD, R. J., Galizio, M., & BARON, A. (1979). Chained schedules of avoidance: Reinforcement within and by avoidance situations. Journal of the Experimental Analysis of Behavior, 32, 399–407.
DEVILLIERS, P. A. (1972). Reinforcement and response rate interaction in multiple random-interval avoidance schedules. Journal of the Experimental Analysis of Behavior, 18, 499–507.
DINGLEDINE, R., IVERSEN, L. L., & BREUKER, E. (1978). Naloxone as a Gaba antagonist: Evidence from iontophoretic, receptor binding, and convulsant studies. European Journal of Pharmacology, 47, 19–27.
DYKSTRA, L. A., & MCMILLAN, D. E. (1977). Electric shock titration: Effects of morphine, methadone, pentazocine, nalorphine, naloxone, diazepam, and amphetamine. Journal of Pharmacology and Experimental Therepeutics, 202, 660–669.
FANSELOW, M. S., & BAACKES, M. P. (1982). Conditioned fear-induced opiate analgesia on the formalin: Evidence for two aversive motivational systems. Learning and Motivation, 13, 200–221.
FANSELOW, M. S., & BOLLES, R. C. (1979). Naloxone and shock-elicited freezing in the rat. Journal of Comparative and Physiological Psychology, 93, 736–744.
GALIZIO, M., Gore, S., & SANDERSON, P. (1983). Effects of naloxone on acquisition and extinction of jump-up avoidance behavior in rats. Learning and Motivation, 14, 48–57.
GALIZIO, M., SMALTZ, S. C., & SPENCER, B. A. (in press). Effects of ethanol and naltrexone on free-operant behavior in rats. Pharmacology, Biochemistry, and behavior.
GREVERT, P., & GOLDSTEIN, A. (1978). Naloxone fails to alter experimental pain or mood in humans. Science, 199, 1093–1095.
HOLTZMAN, S. G. (1976). Effects of morphine and narcotic antagonists on avoidance behavior of the squirrel monkey. The Journal of Pharmacology and Experimental Therapeutics, 196, 145–155.
HOLTZMAN, S. G., & JEWETT, R. E. (1973). Stimulation of behavior in the rat by cyclazocine: Effects of naloxone. The Journal of Pharmacology and Experimental Therapeutics, 187, 380–390.
HYSON, R. L., ASHCRAFT, L. J., DRUGAN, R. C., GRAU, J. W., & MAIER, S. F. (1982). Extent and control of shock affects naltrexone sensitivity of stress-induced analgesia and reactivity to morphine. Pharmacology, Biochemistry, and Behavior, 17, 1019–1025.
KOOB, G. F., LEMOAL, M., & BLOOM, F. E. (1981). Enkephalin and endorphin influences on appetitive and aversive conditioning. In J. L. Martinez, R. A. Jensen, R. B. Messing, H. Rigter, & J. L. McGaugh (Eds.), Endogenous peptides and learning and memory processes (pp. 249–268). New York: Academic Press.
KOSTOWSKI, W., & PLAZNICK, A. (1979). Naloxone-induced facilitation of conditioned avoidance behavior in rats. Polish Journal of Pharmacology and Pharmacy, 31, 293–296.
LEWIS, J. W., CANNON, J. T., & LIEBESKIND, J. C. (1980). Opioid and nonopioid mechanisms of stress analgesia. Science, 208, 623–625.
MAIER, S. F., SHERMAN, J. E., LEWIS, J. W., TERMAN, G. W., & LIEBESKIND, J. C. (1983). The opioid/nonopioid nature of stress-induced analgesia and learned helplessness. Journal of Experimental Psychology: Animal Behavior Processes, 9, 80–90.
MESSING, R. B., Jensen, R. A., MARTINEZ, J. L., SPEIHLER, V. R., Vasquez, B. J. SOUMIREU-MOURAT, B., LIANG, K. C., & MCGAUGH, J. L. (1979). Naloxone enhancement of memory. Behavioral and Neural Biology, 27, 266–275.
RIESS, D., (1970). Sidman avoidance in rats as a function of shock intensity and duration. Journal of Comparative and Physiological Psychology, 73, 481–485.
SAWYNOK, J., PINSKY, C., & LABELLA, F. S. (1979). Minireview on the specificity of naloxone as an opiate antagonist. Life Sciences, 16, 1621–1631.
SNELL, D., FELLER, D., BYLUND, D., & HARRIS, R. A. (1982). Sensitization produced by repeated administration of naloxone is blocked by food deprivation. Journal of Pharmacology and Experimental Therapeutics, 221, 444–452.
WILLER, J. C., DEHEN, H., & CAMBIER, J. (1981). Stress-induced analgesia in humans: Endogenous opioids and naloxone-reversible depression of pain reflexes. Science, 212, 689–691.
WRAY, S. R., & COWAN, A. (1972). The effects of naloxone, chlorpromazine, and halperidol pretreatment on levallorphan-induced disruption of rat’s operant behavior. Psychophar-macologia, 26, 261–270.
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This research was supported in part by Grant #RII-8308469 from the National Science Foundation.
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Galizio, M., Sanderson, P.E. Effects of Naloxone and Shock Intensity on Variable-Cycle Avoidance Performance in Rats. Psychol Rec 35, 213–220 (1985). https://doi.org/10.1007/BF03394927
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DOI: https://doi.org/10.1007/BF03394927