Brain activity patterns don't simply align as friendships form, study finds
Researchers at ETH Zurich studied pairs of strangers who drew together over six weeks. Contrary to expectations, the similarity of their brain activity did not increase as they became closer. The findings challenge assumptions about interpersonal neural synchrony.
A six-week study at ETH Zurich tracked pairs of strangers as they engaged in a collaborative drawing task, monitoring their brain activity throughout the sessions. The researchers anticipated that as interpersonal bonds strengthened, neural patterns would show increasing alignment between the two participants.
Instead, the data revealed no such convergence. Brain activity similarities remained stable or even diverged despite growing familiarity and closeness between the pairs. This outcome directly contradicts a prevailing assumption in social neuroscience that interpersonal neural synchrony naturally escalates with relationship development, suggesting the connection between brain alignment and social bonding may be more complex than previously theorized.
This finding could reshape how researchers interpret neural synchrony studies, potentially influencing fields from social psychology to therapeutic practices that emphasize interpersonal attunement. Clinicians and relationship counselors may need to reconsider assumptions about what neural alignment signifies in human connection. However, the study's specific parameters—strangers, a drawing task, six weeks—limit broad generalization. Future research may explore whether different activities, longer timelines, or pre-existing relationships yield different patterns, ultimately refining our understanding of how brains interact during social bonding.