Processing speed at 19 months correlates with expressive vocabulary between 18 and 31 months, but processing speed at 25 and 31 months does not¶

Claim · All claims
Evidence · 1 study · associational r2 · q3
Currency · newest study 2019 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? Mean RT at 19 months correlated significantly with expressive vocabulary measures from 18 to 31 months and at 36 months, while RT at 25 and 31 months showed no such associations. → Michelle S. Peter 2019

Evidence¶

Michelle S. Peter 2019¶

Michelle S. Peter, Samantha Durrant, Andrew Jessop, Amy Bidgood, Julian M. Pine, Caroline F. Rowland. (2019). Does speed of processing or vocabulary size predict later language growth in toddlers? Cognitive Psychology 115 (2019) 101238. https://doi.org/10.1016/j.cogpsych.2019.101238

q3 · i? · associational · r2

Correlational analysis relating each child's mean RT at 19, 25 and 31 months to expressive vocabulary scores from 8 to 37 months, with Holm-corrected p-values. Correlations at 19 months ranged from −0.34 to −0.45; the authors note "no evidence of such an association between speed of processing at either 25 or 31months and vocabulary".

"There were significant correlations between Mean RT at 19months and all expressive vocabulary measures between 18 and 31months, and at 36months, indicating that individual differences in speed of processing at 19months were associated with earlier, concurrent, and later vocabulary."

Discussion¶

Related Claims¶

• Faster word recognition at 24 months is associated with larger vocabularies and greater vocabulary gains in Spanish-learning children — related
• Individual differences in processing speed remain broadly stable between 19 and 31 months — related
• Processing speed at 19 months does not significantly influence linear vocabulary growth between 19 and 30 months — related
• Faster processing speed at 19 months predicts faster syntactic growth between 19 and 30 months, controlling for concurrent vocabulary — related
• Faster processing speed predicts greater vocabulary growth only for children with smaller vocabularies at 19 months — related
• Vocabulary size at 19 months is a strong predictor of later syntactic growth between 19 and 30 months — related
• Early ANS acuity does not predict later expressive vocabulary; only initial vocabulary size predicts vocabulary six months later — related
• Lexical processing speed at 36 months is associated with concurrent receptive vocabulary, but more weakly than at younger ages — related