This article was written by Giovanni Luca Cascio Rizzo, an assistant professor of marketing at the University of Southern California, for The Conversation — a nonprofit news organization dedicated to sharing the knowledge of researchers and scientists, under a Creative Commons license. Read the original article here.
When people use hand gestures that visually represent what they’re saying, listeners see them as more clear, competent, and persuasive. That’s the key finding from my new research published in the Journal of Marketing Research, where I analyzed thousands of TED Talks and ran controlled experiments to examine how gestures shape communication.
Talking With Your Hands
Whether you’re giving a presentation, pitching an idea, or leading a meeting, you probably spend most of your prep time thinking about what you’ll say. But what about the ways you’ll move your hands?
I grew up in Italy, where gesturing is practically a second language. Now that I live in the United States, I’ve become acutely aware of how cultures differ in how, and how much, people move their hands when they talk. Still, across contexts and cultures, one thing is constant: People do talk with their hands.
As someone who studies communication, I’d noticed how some speakers seemed instantly clearer when they gestured. This made me wonder: Do gestures actually make communicators more effective?
The short answer is yes, but only when the gestures visually represent the idea you’re talking about. Researchers call these movements “illustrators.” For example:
- When talking about distance, you might spread your hands apart while saying something is “farther away.”
- When explaining how two concepts relate, you might bring your hands together while saying “these ideas fit together.”
- When describing how the market demand “is going up and down,” you could visually depict a wave shape with your hands.
To study gestures at scale, my team and I analyzed 200,000 video segments from more than 2,000 TED Talks using AI tools that can detect and classify hand gestures frame by frame. We paired this with controlled experiments in which our study participants evaluated entrepreneurs pitching a product.
The same pattern of results appeared in both settings. In the AI-analyzed TED Talk data, illustrative gestures predicted higher audience evaluations, reflected in more than 33 million online “likes” of the videos. And in our experiments, 1,600 participants rated speakers who used illustrative gestures as more clear, competent, and persuasive.
How Hands Can Help Get Your Point Across
What I found is that these gestures give listeners a visual shortcut to your meaning. They make abstract ideas feel more concrete, helping listeners build a mental picture of what you’re saying. This makes the message feel easier to process — a phenomenon psychologists call “processing fluency.” And we found that when ideas feel easier to grasp, people tend to see the speaker as more competent and persuasive.
But not all gestures help. Movements that don’t match the message — like random waving, fidgeting or pointing to things in the space — offer no such benefit. In some cases, they can even distract.
A practical takeaway: Focus on clarity over choreography. Think about where your hands naturally illustrate what you’re saying — emphasizing size, direction, or emotion — and let them move with purpose.
What’s Next
Your hands aren’t just accessories to your words. They can be a powerful tool to make your ideas resonate.
I’m now investigating whether people can learn to gesture better — almost like developing a nonverbal vocabulary. Early pilot tests are promising: Even a 5-minute training session helps people become clearer and more effective through the use of appropriate hand gestures.
While my research examined how individual gestures work together with spoken language, the next step is to understand what makes a communicator effective with their voice and, ultimately, across all the channels they use to communicate — how gestures combine with voice, facial expressions and body movement. I’m now exploring AI tools that track all these channels at once so I can identify the patterns, not just the isolated gestures, that make speakers more effective communicators.
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