Going Beyond Input Quantity: Wh-Questions Matter for Toddlers' Language and Cognitive Development

Area of Science:

• Child Development
• Linguistics
• Psychology

Background:

• Vocabulary acquisition is linked to language input quantity.
• Specific input features influencing vocabulary learning require further investigation.
• Wh-questions represent a challenging yet potentially beneficial form of communicative input.

Purpose of the Study:

• To investigate the association between fathers' use of wh-questions and their toddlers' vocabulary development.
• To examine the relationship between fathers' wh-question input and children's later verbal reasoning skills.
• To explore the characteristics of children's responses to wh-questions compared to other question types.

Main Methods:

• A sample of 41 low-income, African-American father-child dyads (children aged 24 months) participated.
• Home-based free play sessions were videotaped, transcribed, and coded for input quantity and wh-question frequency.
• Children's productive vocabulary (24 months) and verbal reasoning skills (1 year later) were assessed using standardized measures.

Main Results:

• The overall quantity of father's speech did not correlate with children's vocabulary or reasoning skills.
• Fathers' frequency of using wh-questions positively related to both children's vocabulary and verbal reasoning outcomes.
• Children's responses to wh-questions were more frequent and exhibited greater syntactic complexity (higher mean length of utterance).

Conclusions:

• The quantity of father talk is less critical than the quality of input, specifically the use of wh-questions.
• Posing wh-questions to toddlers is an effective strategy for eliciting verbal responses that support vocabulary growth and verbal reasoning.
• Targeting specific input features like wh-questions can optimize early language and cognitive development interventions.