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Mean ± SEM number of choices toward the CS odor during the Y-maze test. Training infusion of ACh and the α1 agonist phenylephrine (α1ago) and the α2 antagonist idazoxan (α2 antago) increased the learned relative odor preference compared with the other groups (n = 3–7 per group). The asterisk represents significant differences from all other groups (p < 0.001). The dotted horizontal line represents a chance line.
