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Related Experiment Video

Updated: Nov 27, 2025

Using Wavelet Entropy to Demonstrate how Mindfulness Practice Increases Coordination between Irregular Cerebral and Cardiac Activities
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Characterizing Complex Networks Using Entropy-Degree Diagrams: Unveiling Changes in Functional Brain Connectivity

Aline Viol1,2, Fernanda Palhano-Fontes3, Heloisa Onias3

  • 1Institute of Theoretical Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary

We introduce geodesic entropy, a new network metric, to analyze brain connectivity. This metric reveals altered brain network patterns after Ayahuasca consumption, indicating changes in consciousness states.

Keywords:
Ayahuascacomplex networksentropyfunctional brain networkspsychedelic state

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Area of Science:

  • Neuroscience
  • Network Science
  • Complexity Science

Background:

  • Understanding human brain functional connectivity is crucial for neuroscience.
  • Existing network metrics may not fully capture complex network influences on individual nodes.
  • Characterizing network structure provides insights into emergent behaviors like sustained activity.

Purpose of the Study:

  • To introduce a novel network metric, geodesic entropy, for analyzing functional connectivity.
  • To quantify the influence on a specific node based on overall network structure.
  • To investigate the effects of Ayahuasca on human brain functional connectivity.

Main Methods:

  • Developed the geodesic entropy metric, quantifying Shannon entropy of distance distributions to a node.
  • Applied the metric to functional brain network data from individuals in resting state.
  • Compared brain network structures in ordinary consciousness versus Ayahuasca-altered states.

Main Results:

  • Geodesic entropy successfully differentiated between ordinary and Ayahuasca-altered states of consciousness.
  • Functional brain networks in the Ayahuasca-altered state exhibited higher average geodesic entropy.
  • The findings suggest significant alterations in brain network organization under Ayahuasca.

Conclusions:

  • Geodesic entropy is a valuable tool for characterizing network influences and understanding brain states.
  • This metric offers new insights into the neurobiological effects of psychedelic substances.
  • The study highlights the potential of geodesic entropy for analyzing diverse empirical networks.