Experiment 1C. Top: Mean numbers of infusions on the last 2 of 3 sessions of
operant licking for 16% sucrose, glucose, and fructose. The leftmost
column shows the last glucose period of Exp. 1B. The 3 glucose periods did not
differ and are averaged for analyses. Significant difference (p < 0.05)
between sucrose and glucose infusions indicated by single asterisk, difference
(p < 0.05) between fructose and both sucrose and glucose indicated by double
asterisks. Bottom: Infusions per 10-min bin during the 1-h sessions. Inset:
cumulative infusions during the sessions. Infusions of glucose were greater than
those of fructose in bins 1–4, and glucose exceeded sucrose in bins 1, 3
and 4.