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Experiment 1B. Top: Mean numbers of infusions on the last 2 of 3 sessions of operant licking for 16%, 8%, 32% and 16% glucose, in that order. Significant differences (p < 0.05) from the first glucose condition are indicated by asterisks. Bottom: Infusions per 10-min bin during the 1-h sessions. Inset: cumulative infusions during the sessions. Infusions of 8% glucose were greater than those of 16% and 32% in bins 1–3, and 16% exceeded 32% in bins 1 and 2.
