Futurity · Health

Brain Activity Shifts as Strangers Form Bonds

Researchers studied how brain activity changes in younger and older adults as they build relationships through a shared creative activity over six weeks.

Sixty-one pairs of participants, divided into same-age and cross-generational groups, engaged in drawing together. Brain activity was recorded using wearable sensors during individual and joint drawing sessions to observe synchronization patterns.

The study focused on 'inter-brain synchrony,' measuring how similarly participants' brains reacted to each other's actions during the shared task. Researchers hypothesized that synchrony would increase as pairs became more familiar.

Contrary to expectations, cross-generational pairs, despite feeling closer, showed decreasing brain synchrony over time. Conversely, same-age pairs, starting with lower synchrony, exhibited an increase throughout the study.

In both groups, brain synchrony was higher during collaborative drawing than during individual drawing, indicating that collaboration enhances synchronization.

The findings suggest that increased closeness doesn't necessarily mean identical brain activity. The 'Mutual Prediction' model, where individuals anticipate and adapt to each other's behavior, may explain the observed age differences, influenced by life experiences.

A second study revealed stable 'two-brain states' during interactions. One state, with lower inter-brain synchrony but higher internal brain synchronization, was more prevalent in cross-generational pairs, potentially indicating a division of roles where one person adapts more.

This research is the first to track brain activity development over weeks in younger and older adults forming relationships, offering new insights into social brain research, particularly for older populations.

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