[Source:  Medical News Today]

Popular wisdom abounds in sayings about how friendships are first formed, such as “birds of a feather flock together” and “friends are on the same wavelength.”

And, as it turns out, there is more than just a grain of truth to these age-old concepts.

A new study led by Carolyn Parkinson — who was formerly based at Dartmouth College in Hanover, MA, but who is now an assistant professor of psychology working at the University of California in Los Angeles — shows that the brains of friends respond in very similar ways to the same stimuli.

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