Abstract
Food-satiated rats bearing feeding-inducing hypothalamic electrodes were given one 45-mg food pellet per minute during 60-min daily sessions, with water continuously available. Electrical stimulation of the lateral hypothalamus (ESLH) was turned on for 3 or 15 sec, either concurrently with pellet delivery or 2-4 sec thereafter. Fifteen seconds of ESLH generated schedule-induced polydipsia (SIP), but 3 sec did not. When 15 sec of ESLH was delayed for 4 sec, strong SIP was manifested even though each ESLH was only initiated after each pellet had been consumed. It is concluded that postpellet hunger is necessary to produce SIP. Hunger during pellet consumption is neither a necessary nor a sufficient condition.
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Supported in part by grants to V. B. -W. (dissertation fellowship from the University of Kansas) and to J. M. (Grant 3080-5038 from the University of Kansas General Research Fund). Data reported in this paper were presented by the senior author at the Fifth Annual Meeting of the Society of Neuroscience, New York, New York, 1975.
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Bruce-Wolfe, V., Freed, W.J. & Mendelson, J. The role of hunger in schedule-induced polydipsia. Bull. Psychon. Soc. 7, 536–538 (1976). https://doi.org/10.3758/BF03337275
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DOI: https://doi.org/10.3758/BF03337275