What a study of 33 U.S. classrooms says about how the hand fills in where words fall short

Opening: We Only Worry About What to Say

When we read a picture book to a child, most of us are busy deciding what words to add. A hard word comes up, so we paraphrase it; we toss out a “What’s this?” to keep the child engaged. These are good habits. But there’s something easy to overlook here. It’s the hand.

Think about it — we move our hands constantly while we talk. We say “a huge elephant showed up” while flinging both arms wide, and “it tiptoed along” while wiggling our fingers. Is this just a tic, or does it actually help a child learn words?

The question gets more urgent when you picture a child who isn’t yet fluent. Pour new words at a child with a thin vocabulary using speech alone, and that child is being asked to understand one unknown word by means of other unknown words. But what if, alongside the word “big,” you showed your arms spreading wide? Couldn’t the eye pitch in where the ear couldn’t keep up?

A team of researchers in the United States looked at exactly this.

The Study’s Central Question

Barnes and colleagues (2023) asked a simple question that had rarely been examined:

“How much, and what kind of, gestures do teachers actually use when they read aloud? And are those gestures related to children’s vocabulary?”

There has been plenty of research on the amount and quality of speech, but how the “nonverbal channel” — the hand as a second pathway — functions in word learning had not drawn enough attention.

How They Studied It: Observing Real Classrooms

A distinctive feature of this study is that it observed real classroom scenes, not an artificial lab. The team recorded teachers reading picture books just as they normally would, then classified, one by one, every gesture that appeared.

The gestures were sorted into five kinds.

  • Iconic gestures — gestures that mime a word’s meaning with the body: spreading the arms on “big,” fluttering the hands on “fly.”
  • Representational gestures — gestures that express a concept or object through hand shape.
  • Deictic gestures — pointing at a picture or text with a finger.
  • Beat gestures — light gestures that keep time with the rhythm of speech, unrelated to meaning.
  • Behavioral gestures — gestures that move an activity along, like turning a page.

Of these, the team paid special attention to the first two — gestures tied directly to a word’s meaning. The study grouped them together and called them “meaning-focused gestures.” These are cases where the hand shows the word’s meaning itself, like spreading your arms while saying “big.”

Design and Participants

  • Participants: 33 teachers in U.S. Head Start (a publicly funded early-education program for children from low-income families) and 306 four-year-old children (around 4.5 years) in their classrooms
  • Setting: In classrooms using an evidence-based curriculum designed to support vocabulary growth, the team observed and recorded picture-book reading conducted by teachers as usual
  • Measure: At the end of the year, the children’s receptive vocabulary (the vocabulary they understand by listening) was measured with a standardized assessment, then compared against how much the teachers gestured

Here, “receptive vocabulary” refers to the words a child understands by hearing, even if the child can’t yet say them. Children usually understand far more words than they can produce, and the size of this understood vocabulary becomes the foundation for later reading and learning.

Results: Meaning-Bearing Gestures Tracked With Vocabulary

The core finding is this.

  • The more a teacher gestured — and especially the more meaning-focused gestures they used — the higher the end-of-year receptive vocabulary scores of the children in that classroom.
  • Gestures tied directly to a word’s meaning were the heart of the effect. It wasn’t beat gestures that simply kept time, but gestures like showing “big” with the arms, that mattered.

What’s interesting is that the amount of gesturing varied widely from teacher to teacher. Iconic gestures that mime meaning, for instance, appeared on average about 0.79 times per minute over the course of reading a book — but some teachers used them richly and others barely at all. Even reading the same book, the amount of “visual cues” a child received differed from classroom to classroom.

Why Would Gesture Matter More for a Child Who Isn’t Fluent?

This is precisely the concern the study set out from. The team holds that nonverbal input — gesture — may be especially helpful for a child with a thin language base. There are two reasons.

Gestures draw the child’s attention to which word matters right now, and at the same time reinforce that word’s meaning by one extra layer.

Put simply: a child with a rich vocabulary can guess at the meaning of an unfamiliar word like “enormous” from the familiar words around it. But for a child who knows few words, even the surrounding words are unfamiliar, so the flow of speech alone makes the new word hard to grab.

In that moment, when the hand spreads both arms wide, the child can receive — through the second channel of the eye — the information the ear couldn’t fully catch. When the single channel of speech is blocked, gesture opens a detour.

Practical Takeaways

Show a Word’s Meaning With Your Body

This is the simplest yet most powerful practice. On “enormous,” spread your arms; on “tiny,” pinch your fingers together; on “flew away,” flutter your hand. Just attaching one motion to each key word in a book opens one more pathway to meaning for your child.

Move Beyond Pointing to Miming

Pointing at a picture with your finger (a deictic gesture) is good too, but in this study what lined up more clearly with vocabulary was gestures that mime meaning. Go beyond “look here” to expressing, with your hand, the motion, size, or shape the word refers to.

No Money, No Special Materials Needed

The greatest strength of this approach is that it costs nothing. Not a new textbook or app — just the hand of the adult doing the reading. Anyone can try it starting at tonight’s reading time.

Limits of the Study

To take these results honestly, it helps to keep a few things in mind together.

  • This is correlation, not causation. The study did not prove that “increasing gestures raises vocabulary”; it is an observation that classrooms where teachers gestured more had higher vocabulary scores. We can’t entirely rule out that teachers who gesture richly also bring other good teaching practices along with them.
  • It studied a specific population and setting. Because the results come from observing four-year-old classrooms in a particular U.S. program (Head Start), generalizing them directly to every age, culture, and home situation calls for caution.
  • It studied classroom teachers, but the mechanism it points to — that gesture aids attention and the input of meaning — offers plenty for parents reading at home as well.

These limits don’t erase the study’s value. If anything, it’s meaningful precisely because it backed up the direction — “gesture may be another channel for word learning” — with real classroom data.

In Closing

The message this study leaves is warm and practical at once.

When you read a book to your child, let your hands speak as much as your words.

No special materials, no expensive program. Just one small motion — spreading both arms on the word “big.” That trivial gesture may become, for a child not yet fluent, one more handle to grab a word by.

When you open a book tonight, try moving your hands along with your mouth.

Source: Barnes, E. M., Hadley, E. B., Lawson-Adams, J., & Dickinson, D. K. (2023). Nonverbal supports for word learning: Prekindergarten teachers’ gesturing practices during shared book reading. Early Childhood Research Quarterly, 64, 302–312. https://doi.org/10.1016/j.ecresq.2023.04.005