These differences suggested a weak trend for higher levels of dopamine transmission in response to mates’ songs in females, but this borderline effect should be treated with caution and validated in future studies.
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Sexual dimorphism in striatal dopaminergic responses promotes monogamy in social songbirds.
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The sentences
Tracking head movement, we observed a significant trend to move the head more during song playbacks in most birds ( Figure 3—figure supplement 2 ).