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Openai/680d4429-3bec-800d-a287-a56ca7e245b1
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===== - 耳や脳の構造は、人種や文化にかかわらず大きくは違いません。人間の聴覚システムは特定の周波数比（例えば2:1＝オクターブ、3:2＝完全五度など）に対して「共鳴」しやすい仕組みを持っています。 ===== * この周波数のシンプルな比率が、「和音」として心地よく感じるもとになっています。逆に複雑な比率（不協和音）は、脳が「不安定」と認識しやすいです。
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