Processing efficiency at 19 months mediates the relation between child-directed speech and 24-month vocabulary¶
Claim · All claims
Evidence · 1 study · associationalr2·q3
Currency · newest study 2013 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Including 19-month processing efficiency in the model reduced the path coefficient from child-directed speech to vocabulary from 12.61 to 7.41, with a significant bootstrap indirect effect (95% CI 0.44 to 13.61); the final model explained 47% of vocabulary variance. → Weisleder Adriana 2013
Evidence¶
Weisleder Adriana 2013¶
Weisleder Adriana, Fernald Anne. (2013). Talking to children matters: Early language experience strengthens processing and builds vocabulary. Psychological Science. https://doi.org/10.1177/0956797613488145
q3 · i? · associational · r2
Mediation analysis (bootstrap per Preacher & Hayes) controlling for maternal education, recording length, and infant vocalizations, testing whether 19-month processing efficiency accounts for the child-directed speech to 24-month vocabulary link. "A bootstrap (Preacher & Hayes, 2004) testing the significance of the indirect effect gave a 95% confidence interval (corrected for bias) of 0.44 to 13.61."
"the parameter estimate for the effect of child-directed speech on vocabulary was reduced from 12.61 to 7.41 when processing efficiency was included in the model"
Discussion¶
Related Claims¶
- Child-directed speech predicts real-time language-processing efficiency at 19 and 24 months and explains gains in efficiency — related
- The mediation of child-directed speech effects through processing efficiency holds after controlling for knowledge of the target words and excluding at-chance performers — possibly the same claim (merge candidate)
- Overheard adult speech is unrelated to 24-month vocabulary, unlike child-directed speech — related
- Maternal talk influences on vocabulary and processing speed are largely overlapping, with each mediating the other's relation to input — related
- Amount of child-directed speech at 19 months predicts expressive vocabulary size at 24 months in low-SES Spanish-learning infants — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
processing-efficiency-mediates-cds-vocabulary |
title |
Processing efficiency at 19 months mediates the relation between child-directed speech and 24-month vocabulary |
description |
Processing efficiency at 19 months mediates the relation between child-directed speech and 24-month vocabulary |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2013 |
generated |
by process:wiki-ingest on 2026-10-17 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — weisleder-adriana-2013 |
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