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Mean time (±SE) spent over peppermint odor CS in the 2-odor choice test. Pups were previously trained in the Odor-Stroke, Odor only, and Stroke only conditioning groups and injected with saline, isoproterenol, or propranolol during training. Pups were not given any drug during testing. Only Odor-Stroke-Saline and Odor-Isoproterenol demonstrated a behavioral preference for the learned odor.
