W. Timberlake et M. Engle, DECREMENTAL CARRYOVER EFFECTS OF SUCROSE INGESTION IN THE NEGATIVE ANTICIPATORY CONTRAST PROCEDURE IN RATS, Journal of experimental psychology. Animal behavior processes, 21(4), 1995, pp. 304-317
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.