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Comparison of the fundamental motion frequency components from the measurements of eye motion, heartbeat, and breathing via Fast Fourier Transform (n = 29 and 18 analyzed windows, respectively, for the two human subjects). (a) Clear correlations were observed for the frequency components between the breaths and breath-related eye motions, and between the heartbeats and heartbeat-related eye motions. (b) Quantification of the breath-related and heartbeat-related eye motion amplitudes.
