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Octave illusion
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==First experiment== The two tones used were pitched at 400 [[hertz|Hz]] and 800 Hz, corresponding roughly to G4 and G5 in modern pitch notation. Each tone was played for 250 [[millisecond|ms]] before switching ears. No gaps were allowed between tones. Both tones were therefore always present during the experiment; only the ears perceiving the high and the low tone at any one time changed repeatedly. After the initial test, the headphones were reversed, and the test was repeated.
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