DECREMENTAL CARRYOVER EFFECTS OF SUCROSE INGESTION IN THE NEGATIVE ANTICIPATORY CONTRAST PROCEDURE IN RATS

To test for retrospective effects of sucrose ingestion in the anticipa tory contrast procedure, 4 experiments examined intake of an initial 0 .15% saccharin solution as a function of the unsignaled interspersing of days in which the 2nd solution was 32% sucrose or 0.15% saccharin. In Experiment 1, rats that received alternating saccharin-saccharin da ys and saccharin-sucrose days drank less saccharin on saccharin-only d ays, and on both days they drank less saccharin than a control group t hat received saccharin only. In Experiment 2, rats that received rando mized saccharin-saccharin and saccharin-sucrose days drank less saccha rin if, and only if, a sucrose day preceded. Experiments 3 and 4 used double and quadruple alternation of saccharin and sucrose days to exam ine persistence of the affects of a sucrose day. The results highlight ed a retrospective carryover effect of sucrose that reduced intake of the initial saccharin solution and apparently was based on sucrose mem ories persisting over days.