Abstract
In a two-shift experiment, four independent groups of thirsty rats received the following treatments: NNN, DDD, NDN, and DND, with each letter denoting the duration of the delay (0 or 30 sec) before receipt of the sucrose reward in each of the three phases of the experiment. While no reliable positive contrast effect was obtained in either shift phase, a significant negative contrast effect was obtained in both shift phases. The paucity of empirical data in this area hinders adequate explanatory attempts.
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Shanab, M.E., Domino, J. & Melrose, S. The effects of shifts in delay of liquid sucrose reward in thirsty rats. Bull. Psychon. Soc. 10, 287–290 (1977). https://doi.org/10.3758/BF03329338
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DOI: https://doi.org/10.3758/BF03329338