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NE and stressors have no effect at longer, 60 and 180 min, ITIs. (A) Experiments 2a (A) and 2b (B): The graphs show the average investigation times to familiar and novel odorants during trials 1&2 at 60 (A) or 180 (B) min ITI, as a function of stressors (Ai) and (Bi) or NE dosage (Aii) and (Bii). At these ITIs no treatment groups investigate the novel odor significantly more than the familiar odor during Trial 2. Stressors and infusion of NE antagonist cocktail have no effect.
