Heart Rate Variability Synchronizes When Non-experts Vocalize Together

Figures

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  Figure 1. A sample of the synchronized audio, respiration, and ECG signals and togetherness ratings for both participants in dyad 1 during the synchronized Long Notes condition.

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  Figure 2. Mean (circles) and SD (bars) for the RMSSD of Heart Rate Variability. *Represents statistically significant differences, using Holm-Bonferroni correction.

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  Figure 3. The spectra of the RR intervals for both participants from dyad 1 (A,B) and their coherence spectrum (C). BS1 and BS2 refer to the 60-s baselines before and after the tasks, respectively. Breathing refers to the breathing condition and LN to the long notes condition. SNsync and SNasync refer to the conditions with synchronous and asynchronous short notes, respectively.

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  Figure 4. Mean and SD for the TFC average on respiration band. *Represents statistically significant differences using Holm-Bonferroni correction.

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  Figure 5. Mean frequency of HRV coherence peaks and of vocal bursts for each dyad, for synchronous short (A) and long notes (B). The correspondence between the frequency of vocal bursts and the first peak in the HRV coherence is striking for long vocalizations (B). For short vocalizations, there is a correspondence between the frequency of onsets and one of the first two peaks in the HRV coherence for seven out of nine dyads (A).

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  Figure 6. The spectra of the RR intervals for both participants from dyad 1 (A,B), the respiration signal from participant 1 (C), and their partial time-frequency coherence (D). Name of the conditions is the same as in Figure 3.

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  Figure 7. Mean and standard deviation of the average of time-frequency coherence after removing the respiration component. *Represents statistically significant differences using Holm-Bonferroni correction.