Results of a new study involving macaque monkeys suggest that speech and music might have shaped the human brain's hearing circuits. Using functional magnetic resonance imaging (fMRI), researchers monitored the brain activity of macaques and healthy human volunteers and how it responded to harmonic sounds, or tones. Humans were more sensitive to pitch, a key component of speech and music, than were the macaques.
Credit: National Science Foundation/Karson Productions
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