A recent neuroimaging study conducted in Finland revealed that sisters exhibit more similar brain activity than friends or acquaintances when watching a movie. This increased similarity was particularly evident in brain areas associated with complex cognitive functions, including the default-mode network and sensory processing regions. The study, published in NeuroImage, sheds light on the potential neural underpinnings of social bonds, suggesting that the closeness of relationships is reflected in the way our brains process shared experiences. Homophily refers to the tendency for individuals …