Effects of shocks,presented at a fixed time of day,on appetitive and general activity of rats |
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| Authors: | Sumio Imada Hiroyuki Kondo Hiroshi Imada |
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| Institution: | 1. Department of Psychology, Kwansei Gakuin University, Uegahara, 662, Nishinomiya, Japan
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| Abstract: | Eating, drinking, locomotion, and rearing activities of rats, maintained under a 12:12-h dark:light cycle, were measured continuously over 24 h a day for 40 days in the KGbox-24. For 20 days, beginning on Day 11, the shocks were given through the grid floor of the box 1 h after the beginning of the dark phase (at 2100 h). The daily food and water intake decreased, and there was no further gain in body weight after the introduction of shocks. The 2100-h shocks had some associative effects: (1) Suppression of ingestion developed during the period of 2000–2100 h; (2) acceleration of general activity developed during the period of 2000–2012 h; (3) anticipatory suppression of eating developed toward the end of the light phase. The 2100-h shocks also had suppressive aftereffects upon eating and drinking, especially during the early stage of the 20-day shock phase. Compensatory drinking was observed during the light phase, but no such effect was found for eating. Some findings which are not usually obtained in short-session experiments remain to be explained. References to two timing systems are made. |
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