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The Effect of Semantic Support on Word Learning

Identification of Treatment Parameters That Maximize Language Treatment Efficacy For Children

Who can join

Ages 2 to 4 · All sexes

Inclusion Criteria:

* Native English Speaking
* Pass pure tone hearing screening or medical report of normal hearing
* 2-3 Years of age
* MCDI expressive scale \<10th percentile

Exclusion Criteria:

* Parental report of other diagnoses
* Enrolled in concurrent treatment elsewhere
* Nonverbal IQ \<75 as measured by the Bayley scales
* Parents unable to consistently bring child to treatment sessions

About the study

The goal of this clinical trial is to compare word learning outcomes in late talking toddlers who are taught different types of words. The main question it aims to answer is if teaching words that come from categories that children already know (e.g., animals) will aid overall word learning. Children will take part in the Vocabulary Acquisition and Usage for Late Talkers (VAULT) word learning treatment and be taught words from more familiar or less familiar categories to see which group learns more words overall.

What is being tested

• VAULT Phase 5 (behavioral)

Sponsor: University of Arizona · Participants: 32 · Started: Jun 10, 2025

Contact the study team

• Mary Alt, PhD · Phone: 520-626-6180
• Nora Evans-Reitz, MS · Phone: 520-626-6885

Official record on ClinicalTrials.gov — NCT05921214

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.