The Brick Activity That Boosted Toddlers' Language Scores by 15%
A landmark clinical trial found that toddlers who played with blocks scored significantly higher on language assessments — outperforming a control group given electronic learning toys.
You've bought the闪亮的电子玩具. The one that sings the alphabet. The one that promises to teach your toddler 200 words before kindergarten. And your toddler has been fixated on the box it came in for three weeks.
There's a running joke among parents that toddlers prefer the packaging to the presents. But buried inside that joke is a genuine developmental insight — and a clinical trial that should make you reconsider what's in your child's toy box.
The study that changed how we understand block play
In 2007, researchers led by Dr. Dimitri Christakis published a landmark randomized controlled trial in JAMA Pediatrics that assigned toddlers to two groups: one given active constructive toys (blocks), and one given electronic toys. The results were striking.
Toddlers in the blocks group scored 15 percent higher on language assessments than those in the electronic toy group.
The mechanism was not the blocks themselves — it was what the blocks prompted parents to do. Electronic toys, with their lights and sounds and automated responses, tend to reduce verbal interaction. Parents stop talking because the toy is already "teaching." With blocks, the conversation is entirely dependent on the humans in the room. And so the verbal scaffolding — the narration, the questions, the "what are you building?" and "how many bricks do you need?" — flows naturally.
What blocks do that screens can't
The difference between block play and electronic toy interaction comes down to a concept developmental psychologists call contingent responsivity — the quality of back-and-forth exchange between a child and their caregiver.
A screen can display a word and a voice can pronounce it. But a screen cannot read your child's pause, notice which brick they're reaching for, or ask a question that meets them exactly where they are. A parent can.
Block play creates what researchers call an open scaffold: a shared activity where the adult must continuously adapt their language to what the child is doing and interested in. That adaptation — that back-and-forth calibration — is precisely what builds vocabulary, sentence structure, and conversational skill.
A 2015–2016 study from Northern Arizona University reinforced this, finding that electronic toys generated significantly fewer adult words, fewer conversational turns, and fewer parental responses during play compared to books or blocks. The blocks won the language race not because they are inherently educational, but because they put the adult and the child in a richer verbal environment.
Why this matters more for some children
The Christakis study is particularly notable because its participants were primarily from middle- and low-income families. The language boost from block play was most pronounced in children who had fewer language-development resources in their home environment.
For children in language-rich environments, blocks provide valuable reinforcement. For children where language exposure is more limited, blocks appear to act as a significant compensatory mechanism — creating the verbal scaffolding that might otherwise be absent.
This is a finding with real equity implications: blocks are cheap, durable, and require no instruction manual. The activity that produced a 15 percent language score improvement costs under twenty dollars.
What to do with this
Put the electronic toys on a shelf for a week. Not permanently — just long enough to notice what's happening in the room when they're not filling it with sound. You'll likely hear more of your own voice.
Narrate the build. Block play gives you a reason to narrate without it feeling forced. "You've put the blue one on top. How many more can we fit before it falls?" These aren't lessons — they're conversations.
Ask open-ended questions. "What are you making?" is fine. "Tell me about what you're building" is better. The extended answer gives your toddler more language to practice and more reason to practice it.
Build together, don't direct. The language scaffolding happens most naturally when you're a participant, not a teacher. Let your toddler lead; your job is to reflect back what they're doing and extend it by one small step.
The short version
A landmark clinical trial found that toddlers who played with blocks scored 15 percent higher on language assessments than a control group — and outperformed children given electronic learning toys. The reason isn't the blocks themselves; it's what blocks do to the verbal environment between parent and child. Electronic toys reduce the need for adults to talk. Blocks require it. Every time you build with your toddler and describe what you're seeing, you're delivering a language intervention disguised as play.