Personally, I’m a hugger. However, most of those hugs precede handshakes. One can’t move too fast on the whole getting to know you scale. Plus, shaking hands first eases a stranger’s feelings about you. Don’t believe me? Science says so.

Beckman Institute researcher Florin Dolcos and University of Illinois postdoctoral research associate Sanda Dolcos found that  “a handshake preceding social interaction enhanced the positive impact of approach and diminished the negative impact of avoidance behavior on the evaluation of social interaction.”

That makes sense. Their study, published in the December issue of the Journal of Cognitive Neuroscience, gives scientific proof for the first time about why a handshake is important.

The study showed “increased sensitivity to approach than to avoidance behavior in amygdala and superior temporal sulcus, which were linked to a positive evaluation of approach behavior and a positive impact of handshake.” Also, the “nucleus accumbens, which is a reward processing region, showed greater activity for Handshake than for No-handshake conditions” — proving a link to “the positive effect of handshake on social evaluation.”

“Overall, our study not only replicated previous reports that identify activity in regions of the social cognition network, but also provided insight into the contribution of these regions into evaluating approach and avoidance social interactions, and grant neuroscientific support for the power of a handshake,” Sanda Dolcos said.

Florin Dolcos says that a firm, confident, and friendly handshake leads to positive feelings.

“In a business setting this is what people are expecting, and those who know these things use them,” he said. “Not a very long time ago you could get a loan based on a handshake. So it conveys something very important, very basic. Yet the science underlying this is so far behind. We knew these things intuitively but now we also have the scientific support.”

There you have it. But beware: I’m still giving you a hug when I see you next.

(Story materials and image via the Beckman Institute.)