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Effects of estradiol on distance calls (top) and visual scanning behavior (bottom). Data (mean±S.E.) were pooled across song exposure groups, as the effects of the auditory stimuli did not differ among them. Sample sizes: Estradiol-treated tutored song = 6, estradiol-treated untutored song = 8, estradiol-treated silence = 7, blank-treated tutored song = 5, blank-treated untutored song = 6, blank-treated silence = 6. * p< 0.031
