This is the research companion to Turns, Not Words. Read the main post first.
Back in the kitchen, the apple still needs slicing. Your baby offers a sound, you answer, and then you wait to see what comes back. What does that exchange offer that a running commentary doesn’t, and how much depends on what your child is already trying to tell you?
Beyond the word count
Romeo, R. R., Leonard, J. A., Robinson, S. T., West, M. R., Mackey, A. P., Rowe, M. L., & Gabrieli, J. D. E. (2018). Beyond the 30-million-word gap: Children’s conversational exposure is associated with language-related brain function. Psychological Science, 29(5), 700-710.
What they found: Among 36 four- to six-year-olds, children who had more conversational turns in home recordings showed greater activity in a language-related brain region while listening to stories. The association held after accounting for family income, parent education, and word counts. More turns also went with stronger verbal skills.
Why this matters for you: The exchange deserves attention alongside the words. In the recording system, a turn is one utterance by adult or child, answered by the other, within about five seconds. That’s how the researchers counted vocal exchanges. It isn’t a deadline to impose at dinner, and an audio recording won’t count a pointed finger or a sign.
What it doesn’t answer: This was a small, cross-sectional study. It can’t show that adding turns causes changes in brain activity or language, or prescribe a number of turns for your child. The sample excluded children with a history of speech-language therapy, among other restrictions.
Children help build the exchange
Donnelly, S., & Kidd, E. (2021). The longitudinal relationship between conversational turn-taking and vocabulary growth in early language development. Child Development, 92(2), 609-625.
DOI: 10.1111/cdev.13511
What they found: Researchers followed 122 children from nine to twenty-four months, using daylong recordings and parent reports of vocabulary. Growth in conversational turns predicted vocabulary growth, and vocabulary growth predicted more turns, even after accounting for adult word counts and children’s vocalizations.
Why this matters for you: Your child helps make the conversation possible. As they have more to say, there can be more for you to answer. We wouldn’t turn a quiet day into a report card on your parenting. Look for an opening in what your child offers, rather than treating every exchange as something you must produce.
What it doesn’t answer: Prediction over time isn’t proof of cause and effect. The families were relatively advantaged and predominantly English-speaking, which limits how widely the findings can be applied. The study doesn’t establish who should start each exchange or a target turn count.
Talk about what has their attention
McDuffie, A., & Yoder, P. (2010). Types of parent verbal responsiveness that predict language in young children with autism spectrum disorder. Journal of Speech, Language, and Hearing Research, 53(4), 1026-1039.
DOI: 10.1044/1092-4388(2009/09-0023)
What they found: In 32 young autistic children, parents’ comments and directions that followed the child’s focus predicted vocabulary six months later, after accounting for time engaged with objects. Parents’ expansions of children’s communication also predicted later vocabulary after accounting for children’s communication rate.
Why this matters for you: If your child is watching the dog, that’s a place to join them. A comment about the truck asks them to leave what they’re attending to before the exchange can begin. Answering “dog run” with “The dog’s running” adds language to something they’re already communicating.
What it doesn’t answer: The study observed families; it didn’t randomly assign parents to different ways of talking. It doesn’t establish that following attention caused vocabulary growth, that redirecting attention is always unhelpful, or that these findings cover every autistic child’s communication.
A question can follow the child’s lead
Haebig, E., McDuffie, A., & Ellis Weismer, S. (2013). The contribution of two categories of parent verbal responsiveness to later language for toddlers and preschoolers on the autism spectrum. American Journal of Speech-Language Pathology, 22(1), 57-70.
DOI: 10.1044/1058-0360(2012/11-0004)
What they found: In a study of 40 autistic toddlers and preschoolers, parents’ questions and prompts for language within the child’s focus predicted comprehension and spoken language a year later. Those associations held after accounting for initial language, parent education, and child engagement. The contribution of comments also differed with children’s initial language level.
Why this matters for you: Following a child’s lead doesn’t mean banning questions. “What’s he doing?” can join a child who’s watching the dog. The useful distinction is whether the question stays with their interest and gives them room to answer, or recruits them into a different conversation.
What it doesn’t answer: This was observational research, not a test of a question-asking program. It doesn’t show that more questions are always better or that every child benefits from the same mix of comments and prompts. It didn’t test a universal approach to signs, devices, or scripts.
Words and responsiveness both matter
Bornstein, M. H., Putnick, D. L., Bohr, Y., Abdelmaseh, M., Lee, C. Y., & Esposito, G. (2020). Maternal sensitivity and language in infancy each promotes child core language skill in preschool. Early Childhood Research Quarterly, 51, 483-489.
DOI: 10.1016/j.ecresq.2020.01.002
What they found: In a longitudinal study of 50 mother-infant pairs, maternal sensitivity and maternal language at five months each independently predicted children’s language skills at 49 months. The analyses accounted for maternal age, education, verbal intelligence, and later supportive presence.
Why this matters for you: The words still matter. Making room for a reply doesn’t mean rationing what you say. You can name the apple, answer the babble, and notice when your child is ready for something else. Responsiveness and language can belong in the same kitchen.
What it doesn’t answer: The study examined mothers and infants and was observational. It didn’t isolate conversational turns or test whether responsiveness explains the brain-imaging finding. It supports keeping both language and sensitivity in view, without establishing a recipe for either.
Coming Up
The kid is not the patient. The treatments for childhood behavior problems with the deepest trial record barely touch the child. They change the parent’s half of the interaction, and the child changes because the relationship does. Why that is good news.
Every Functional Child Development post comes with a Dive Deeper companion. Subscribe for the full picture.
