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Related Experiment Video

Updated: Sep 10, 2025

Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study
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Brain Oscillations and Autonomic Synthonization via Comodulation in Collaborative Negotiation.

Katia Rovelli1,2, Carlotta Acconito1,2, Laura Angioletti1,2

  • 1International Research Center for Cognitive Applied Neuroscience (IrcCAN), Università Cattolica del Sacro Cuore, Largo Gemelli 1, 20123 Milan, Italy.

Entropy (Basel, Switzerland)
|August 28, 2025
PubMed
Summary

Neural and physiological synthonization (Synth) reflects social cognitive alignment during negotiation. Heart rate variability Synth increased during core negotiation, revealing distinct personality patterns related to Synth and reward sensitivity.

Keywords:
autonomic responsesdecision-makingemotion regulationinter-brain connectivitynegotiationneural synthonization

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Area of Science:

  • Neuroscience
  • Psychophysiology
  • Social Cognition

Background:

  • Dyadic exchanges involve complex social cognitive and emotional processes.
  • Understanding neural and physiological synchrony (Synth) offers insights into interpersonal dynamics.
  • Comodulation analysis quantifies synchronized neural and physiological activity.

Purpose of the Study:

  • To investigate the relationship between neural and physiological synthonization (Synth) in negotiation.
  • To examine how Synth in different frequency bands and heart rate variability (HRV) changes across negotiation phases.
  • To explore potential links between HRV-based Synth, personality, and reward sensitivity.

Main Methods:

  • 13 dyads performed a negotiation task with Initiation, Negotiation Core, and Resolution phases.
  • Electroencephalographic (EEG) delta, theta, and alpha bands and HRV were recorded.
  • Synth was quantified using Euclidean distance (EuDist) for EEG and HRV indices.

Main Results:

  • Significant neural Synth was observed in delta, theta, and alpha bands, indicating social cognitive alignment.
  • HRV Synth was higher during the Negotiation Core Phase compared to the Initiation Phase.
  • Cluster analysis of HRV EuDist revealed two groups differing in Synth and reward sensitivity.

Conclusions:

  • Neural and autonomic Synth are key indicators of social cognitive alignment and emotional regulation during negotiation.
  • HRV Synth dynamics provide insights into interpersonal coordination.
  • Individual differences in Synth and reward sensitivity may reflect distinct interpersonal patterns.