Back-and-forth conversation, not word count, predicted language brain activity
A neuroimaging study linking conversational turns with brain function and language skill
Reviewed by Sian Trombley, CCCFounder, Thrive Family Company
Moderate confidence
Source citation
Romeo R. R., Leonard J. A., Robinson S. T., West M. R., Mackey A. P., Rowe M. L., et al. (2018). Beyond the 30-Million-Word Gap: Children's Conversational Exposure Is Associated With Language-Related Brain Function. Psychological Science. https://doi.org/10.1177/0956797617742725
Published 1 January 2018 · Added to Thrive 26 July 2026 · Reviewed 26 July 2026
Share this
For years the advice was to talk more. This study suggests the important part is the turn-taking.
Published research findings
The study
Romeo and colleagues recorded children's home language environments and measured brain activity during language processing.
What researchers examined
Whether adult word count or conversational turn-taking better predicted language-related brain function.
What they found
Conversational turns predicted activation in language regions and verbal skill, and largely accounted for the association with socioeconomic status. Adult word count alone did not.
Thrive editorial interpretation
What this may mean for families
Quality of exchange matters more than volume of speech. A short back-and-forth beats a monologue.
What this doesn't tell us
Important limitations
A small, cross-sectional sample; correlational findings cannot establish causation.
Evidence confidence describes how much weight this study's design can carry — not how strongly the finding applies to any individual child or family.
Therapist perspective — Thrive interpretation, not a finding of the study
Therapist Perspective
Ask a question, wait, and respond to the answer. That is the whole intervention.
Practical family considerations
Turn-taking beats talking at your child.
This research summary is educational and does not replace individualized medical, psychological or therapeutic advice.
Share this