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Genetic defect keeps verbal cues from hitting the mark: Gene found in human speech problems affects singing, not learning in songbirds

A genetic defect that profoundly affects speech in humans also disrupts the ability of songbirds to sing effective courtship tunes. This defect in a gene called FoxP2 renders the brain circuitry insensitive to feel-good chemicals that serve as a reward for speaking the correct syllable or hitting the right note, a recent study shows.
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