Can you tell what a politician thinks about an issue just by watching their hands?

“In laboratory tests, right- and left-handers associate positive ideas like honesty and intelligence with their dominant side of space and negative ideas with their non-dominant side,” says Daniel Casasanto of the Max Planck Institute for Psycholinguistics in Nijmegen, Netherlands. To find out whether people link ‘good’ with ‘dominant’ beyond the laboratory, Casasanto and co-author Kyle Jasmin examined spontaneous gestures during positive and negative speech in the final debates of the most recent US presidential elections. The 2004 and 2008 elections involved two right-handers (Kerry, Bush) and two left-handers (Obama, McCain). Casasanto and Jasmin found that right-handed candidates made a greater proportion of right-hand gestures when expressing positive ideas and left-hand gestures when expressing negative thoughts. But the opposite was found for the left-handers, who favored their left hand more for the positive and their right hand for the negative. Obama’s ‘right-hand man’ may be on his left. (PLoS ONE July 28, 2010)

…The hand that speakers use to gesture may provide an index of how they feel about what they are saying. Speakers may not know they are sending this message, since people are generally unaware of how they are gesturing, and often unaware that they are gesturing at all.

For some speakers, the link between hand and positive-negative speech may be dramatic enough to observe with the ‘naked eye’, particularly in the non-dominant hand, which often makes fewer gestures overall. In these debates, non-dominant hand gestures occurred more often during negative statements than during positive statements by a ratio of about 2 to 1 for Obama, 3 to 1 for Kerry, and 12 to 1 for McCain. Watching politicians’ hands could help voters to know their minds.

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