Figure 1.

Schematic outline of the single-bottle experience task. Rats in the novel group were given 10 mL of water on days 1–6 and 0.01% isoamyl acetate (novel odor), 0.1-M sucrose (novel taste), or a mixture of 0.01% isoamyl acetate-0.1-M sucrose (novel odor-taste) on day 7. Rats in the familiar groups received 10-mL water on days 1–3 and 0.01% isoamyl acetate (familiar odor), 0.1-M sucrose (familiar taste), or a mixture of 0.01% isoamyl acetate-0.1-M sucrose (familiar odor-taste) on days 4–7. On the final experimental day (day 7), all rats received only 5 mL of liquid.