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. 2014 May 16;9(5):e97680. doi: 10.1371/journal.pone.0097680

Figure 2. Significant synchronization in right leg movements of ID1 during the music condition “Everybody” (108.7 BPM) (Video S3).

Figure 2

(A) Sound wave of the auditory stimulus (yellow) with the detected beat onsets (red vertical lines). (B) Observed (left) and phase-randomized (right) position data s pos (t) along the Y coordinate axis when the infant moved continuously over a period of three seconds (defined as a moving section). (C) Instantaneous phase of the musical beat φ music (t) calculated from the detected beat onsets. (D) Instantaneous phase of the motion φ motion (t). (E) Relative phase φ rel (t) between motion and the musical beat. (F) Circular histograms of φ rel (t). (G) Monte-Carlo statistics showed that the observed synchronization index (magenta line) was above the 95% confidence interval of the surrogate synchronization indexes (blue lines) calculated from the 10,000 phase-randomized position data: The observed movement was significantly synchronized to the musical beat.