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. 2014 Oct 20;4:6675. doi: 10.1038/srep06675

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Varying the waveform of the musical signal from (a) a sinusoidal signal of 200 Hz to (b) a square signal of 200 Hz to (c) a composite signal (a superposition of 200 Hz and 300 Hz sinusoidal signals), while the amplitude is fixed at A_signal = 1 mm. Corresponding input sound wave is displayed on the top right of each microscope image.