When do we fall in neural synchrony with others?

Soc Cogn Affect Neurosci. 2019 Mar 5;14(3):253-261. doi: 10.1093/scan/nsz012.


This study aimed to investigate the situation in which interpersonal brain synchronization (IBS) occurs during a collaborative task and examined its trajectory over time by developing a novel functional near-infrared spectroscopy (fNIRS)-based hyperscanning paradigm. Participants were asked to perform a collaborative task in three-person groups where two of the members are real participants and one is a confederate. Compared to dyads between real participants and confederates, real-participant pairings showed greater cooperation behavior and IBS between bilateral dorsolateral prefrontal cortex. And, IBS and cooperation increased over time in real-participant pairings, whereas they remained low and constant in dyads with the confederate. These findings indicate that IBS occurs between individuals engaging in interpersonal interaction during a collaborative task, during which both IBS and cooperatively interpersonal interaction tend to increase over time.

Keywords: Interpersonal interaction; fNIRS; hyperscanning; interpersonal brain synchronization.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Brain / physiology*
  • Brain Mapping / psychology*
  • Cooperative Behavior*
  • Female
  • Humans
  • Interpersonal Relations*
  • Male
  • Prefrontal Cortex / physiology
  • Social Behavior*
  • Spectroscopy, Near-Infrared
  • Young Adult