Psychology says people who constantly gesture while explaining ideas aren't simply expressive; Goldin-Meadow's research shows gestures help organize thinking during speech

If you've ever caught yourself waving your hands around while trying to explain something complicated, you're not alone, and you're not just being dramatic. According to a study by Autumn Hostetter, Martha Alibali, and Sotaro Kita in Language and Cognitive Processes, hand gestures may do some cognitive work behind the scenes. They seem to help speakers to make a jumbled idea into something that can be said, rather than just adorn what we say.

This isn't a wellness-influencer theory. It’s a real lab study, and it gives us a rather specific glimpse into why our hands seem to have a mind of their own when we’re explaining something.

What the researchers actually did
Researchers recruited 24 university students from a psychology research pool and showed them patterns of dots on a laptop screen, but only for three seconds at a time. Some patterns had faint lines connecting the dots into obvious shapes, like a square or triangle. Others were simply scattered dots with no guide, so it was up to the participants to decide on their own how to group them mentally before describing them aloud into an audio recorder, assuming another participant would later listen to the recording and attempt to redraw the pattern. In fact, no one else ever heard it, only a silent, non-looking experimenter and a hidden video camera.

And here’s the twist: people gestured more while describing the 'connect-the-dots-yourself' patterns than while describing the pre-shaped ones, even though both groups used about the same number of words and spoke for about the same length of time. As part of the same paper, Hostetter, Alibali, and Kita also did another memory control study that confirmed that the unguided patterns were not just harder to remember, ruling out the hypothesis that people gestured more just because they were straining their memory, and instead suggesting that gesture is a tool for organizing the image into words.

So gestures aren't about finding the right word
For years, a popular idea (called the Lexical Access Hypothesis) argued that people gesture mostly to help themselves find a hard-to-find word, like a mental search assist. This study contradicts that. The same Hostetter, Alibali, and Kita research also discovered that the words used in the more difficult, unguided condition were, in fact, more common, everyday English words, not less common or more difficult ones. If gestures were simply a case of accessing words, you’d expect more gesturing when the vocabulary became tougher. That’s not how it went down.

Rather, gesture was correlated with the amount of mental sorting it took to turn a fuzzy visual image into a sharp, linear sentence. This lends support to an idea called the Information Packaging Hypothesis, first proposed by Sotaro Kita, that gestures help break down a complex mental picture into smaller, expressible chunks.

This pattern shows up in other studies, too
This is not a one-off finding. In a study in Language and Cognitive Processes, Martha Alibali, Sotaro Kita, and Amanda Young discovered that children gestured more when explaining why two quantities of playdough were equal (a task that required more logical comparison) than when simply describing how the items looked different, even though they used very similar words in both cases.

In a Goldin-Meadow study with Howard Nusbaum, Spencer Kelly, and Susan Wagner, titled 'Explaining math: gesturing lightens the load,' kids and adults did better on a memory task when they could gesture while explaining a math problem than when they were told to keep their hands still. Gestures may have freed up some mental resources. It’s a different experiment, a different angle, but it points the same way: Our hands may quietly help our brains cope with a busy moment.

Why this matters for how we talk, present, and even job interview
This research provides a small but useful reframe for millennials and young professionals in the age of video calls, pitch decks, and having to constantly explain things to strangers. If you're thinking aloud about something and you gesture a lot, it doesn't necessarily mean you're scattered or overly animated. Or maybe your brain is just sorting through a complicated idea right now.

That said, it’s worth being careful not to go too far. This was a small, specific lab experiment with 24 young adults describing abstract dot patterns, not a sweeping claim about every gesture in everyday life. It does not mean that people who do not gesture much are worse thinkers, and it does not turn hand movements into a personality test or hiring criterion. Gesturing is affected by culture, personality, the specific task being performed, and psychology researchers are typically cautious about drawing sweeping conclusions from a single experiment.

Still, the next time your hands start moving before your sentence is finished, you can let them. Science says they might be helping you think.