There are people who can’t talk unless they’re gesturing. But maybe their hand movements are doing more than helping them speak. Perhaps they’re helping them hear.

According to researchers from Georgetown University Medical Center, what you hear may depend on what your hands are doing.

“Language is processed mainly in the left hemisphere, and some have suggested that this is because the left hemisphere specializes in analyzing very rapidly changing sounds,” said the study’s senior investigator, Peter E. Turkeltaub, M.D., PhD, a neurologist in the Center for Brain Plasticity and Recovery.

The researchers used a simple noise and indication test on 24 volunteers for the study. They had to press a button when they heard background sounds, which were quick or slow.

“We asked the subjects to respond to sounds hidden in background noise,” Turkeltaub said. “Each subject was told to use his or her right hand to respond during the first 20 sounds, then the left hand for the next 20 second, then right, then left, and so on.”

People who used their right hand heard the rapidly changing sounds more often than when using their left hand. It was vice versa for the slowly changing sounds.

“Since the left hemisphere controls the right hand and vice versa, these results demonstrate that the two hemispheres specialize in different kinds of sounds—the left hemisphere likes rapidly changing sounds, such as consonants, and the right hemisphere likes slowly changing sounds, such as syllables or intonation,” Turkeltaub said. “These results also demonstrate the interaction between motor systems and perception. It’s really pretty amazing. Imagine you’re waving an American flag while listening to one of the presidential candidates. The speech will actually sound slightly different to you depending on whether the flag is in your left hand or your right hand.”

I think this research is especially interesting for meeting designers and professional speakers. Imagine the ways you could control what your audience hears by simply having attendees hold something. It would be a fun experiment to present two exact sessions (word for word) to different audiences, one that holds something in the left hand and one in the right hand. Then let’s see if session comprehension and scores are different. Anyone willing to try it out?

(Story quotes from Georgetown University. Image via Flickr: Malthe Sigurdsson / Creative Commons)

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