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Study of Intersubject Synchronization (Changes in Phase Locking Values and Circular Correlation Coefficients) When Performing Creative and Non-Creative Verbal Tasks in Hyperscanning Conditions

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Abstract

The article assesses the intersubject synchronization of bioelectric activity during competitive performance in dyads of creative and non-creative verbal tasks. The study involved 22 pairs of volunteers from 18 to 23 years old. Participants synchronously performed creative (to create original ways to use everyday objects) and non-creative (to list objects from the proposed category) tasks in the conditions of competition with each other. Two methods of calculating the intersubject synchronization are considered: phase locking value and circular correlation coefficient. To detect non-random changes, a permutation approach was used, and artificially noisy comparison samples (controls) were generated by permutation the initial time series: (a) by epochs (2 s) and (b) by each separate time points. Circular correlation coefficients were more “stable” (gave reproducibly similar results) when compared with different controls generated by the permutation approach than phase locking value. We obtained by the analysis of circular correlation coefficients in comparison with the control data generated on the basis of permutation of separate time points: during creative activity, there was mainly an increase in intersubject synchronization in the theta (4–7.8 Hz), alpha-2 (10–13.4 Hz) and beta (13.5–30 Hz) EEG frequency bands, in alpha-1 (8–9.8 Hz), synchronization between the participants decreased. During the control task, bidirectional changes of intersubject synchronization were observed: decrease in theta and alpha-1 frequency bands, bidirectional changes in alpha-2 and beta bands. The comparison of the results shows that in creative activity, even in the conditions of competition, there is a greater intersubject synchronization than in non-creative activity.

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ACKNOWLEDGMENTS

The authors express their gratitude to V.A. Vasenkina, A.V. Grokhotova, and V.A. Galkin for assistance in carrying out the experimental part of the work.

Funding

The work was supported by the Russian Science Foundation (grant No. 22-28-02012).

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Sciences, St. Petersburg, Russia

    Zh. V. Nagornova, N. A. Zyryanov & N. V. Shemyakina

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  1. Zh. V. Nagornova
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  2. N. A. Zyryanov
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  3. N. V. Shemyakina
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Corresponding authors

Correspondence to Zh. V. Nagornova or N. V. Shemyakina.

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The authors declare that they have no conflicts of interest.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

Study was approved by the local bioethical committee of the Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Sciences, St. Petersburg, Russia (#1-02, February 2, 2022).

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Nagornova, Z.V., Zyryanov, N.A. & Shemyakina, N.V. Study of Intersubject Synchronization (Changes in Phase Locking Values and Circular Correlation Coefficients) When Performing Creative and Non-Creative Verbal Tasks in Hyperscanning Conditions. Hum Physiol 49 (Suppl 1), S13–S17 (2023). https://doi.org/10.1134/S0362119723700639

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  • DOI: https://doi.org/10.1134/S0362119723700639

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