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The signals were analyzed using fast Fourier transform (FFT) with a MATLAB program (R2013b, MathWorks, Natick, MA) written by author JK. The amplitudes and phases of the first harmonic (fundamental) components were used to describe the responses. The amplitude and phase data were disregarded when the signal-to-noise ratio (quantified by the ratio of the fundamental component and the average of the component amplitudes at adjacent frequencies; e.g., values at 11 and 13 Hz for 12 Hz responses) was smaller than 2.
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