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hubie [soylentnews.org] writes:

Brain activity imaging coupled with computer vision reveals how neuron populations in different individuals synchronize during social interactions [spie.org]:

Humans are social creatures. But what leads to them being this way? To fully understand how the brain gives rise to social behaviors, we need to investigate it during social encounters. Moreover, we need to analyze not only the internal operations of one brain during social activities but also the dynamic interplay between multiple brains engaged in the same activity. This emerging research field is referred to as "second-person neuroscience" and employs hyperscanning (the simultaneous recording of the activity of multiple brains) as the signature technique.

[...] Now, a research team led by Yasuyo Minagawa of Keio University, Japan, has worked out an elegant solution to this problem. [...]

Each pair of participants (39 pairs in total) engaged in a natural, cooperative, and creative task: the design and furnishing of a digital room in a computer game. They were allowed to communicate freely to create a room that satisfied both. The participants also completed the same task alone as the researchers sought to compare between-brain synchronizations (BBSs) and within-brain synchronizations (WBSs) during the individual and cooperative tasks. The social behavior that the team focused on during the tasks was eye gaze, that is, whether the participants directed their gaze at the other's face. They automatically extracted this behavior from the video footage using an open-source software, which made the data analysis easier.

One of the most intriguing findings of the study was that, during cooperative play, there was a strong BBS among the superior and middle temporal regions and specific parts of the prefrontal cortex in the right hemisphere, but little WBS in comparison. Moreover, the BBS synchronization was strongest when one of the participants raised their gaze to look at the other. Interestingly, the situation reversed during individual play, showing increased WBS within the same regions.

According to Minagawa, these results agree with the idea that our brains work as a "two-in-one system" during certain social interactions. "Neuron populations within one brain were activated simultaneously with similar neuron populations in the other brain when the participants cooperated to complete the task, as if the two brains functioned together as a single system for creative problem-solving," she explains. "These phenomena are consistent with the notion of a 'we-mode,' in which interacting agents share their minds in a collective fashion and facilitate interaction by accelerating access to the other's cognition."

Overall, this study provides evidence hinting at the remarkable capability of the human brain to understand and synchronize with others' when the situation calls for it. [...]

Journal Reference:
Mingdi Xu, Satoshi Morimoto, Eiichi Hoshino, et al., Neurophotonics, Vol. 10, Issue 1, 013511 (February 2023). https://doi.org/10.1117/1.NPh.10.1.013511 [doi.org]

Original Submission