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Directed causal effect with PCMCI in hyperscanning EEG time series.

Lykke Silfwerbrand1,2, Yasuharu Koike2, Pär Nyström3

  • 1Department of Medical Sciences, Psychiatry, Akademiska Sjukhuset, Uppsala, Sweden.

Frontiers in Neuroscience
|April 30, 2024
PubMed
Summary

This study introduces Tigramite, a new method to analyze brain activity during social interactions. Tigramite successfully detected directed causality within and between brains, offering insights into neural networks during collaboration.

Keywords:
PCMCITigramitecausal effectdirected causalitydual-EEGhyperscanning EEG

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Computational Neuroscience

Background:

  • Social interactions involve complex brain activity and inter-brain communication.
  • Analyzing directed causality in neural data, especially during social tasks, remains challenging.
  • Hyperscanning electroencephalography (EEG) offers a window into simultaneous brain activity of interacting individuals.

Purpose of the Study:

  • To assess the efficacy of Tigramite, a novel time-domain causal discovery method, for analyzing directed causality in hyperscanning EEG data.
  • To investigate inter-brain and intra-brain causal relationships within the prefrontal cortex (PFC) during a structured social task.

Main Methods:

  • Utilized hyperscanning EEG to record brain activity from individuals engaged in a leader-follower finger-tapping task.
  • Applied Tigramite, a graph-based causal discovery algorithm, to analyze time-series EEG data from the prefrontal cortex (PFC).
  • Examined directed causal connections both within individual brains and between the brains of interacting partners.

Main Results:

  • Significantly directed causal influences were detected within individual brains during the task.
  • Directed causal effects were also identified between the brains of interacting individuals.
  • This marks the first empirical demonstration of Tigramite's ability to detect inter- and intra-brain causality in hyperscanning EEG.

Conclusions:

  • TigraMite is a viable method for identifying directed causality in time-domain hyperscanning EEG data.
  • The findings provide empirical evidence for neural causality during social interactions.
  • This approach holds promise for future research into neural network dynamics during social cognition and behavior.