„The children’s degree of active interest and the rate of maternal utterances in shared book reading were both predictive of the children’s expressive language skills and later letter knowledge at age 42 months.“
Univ.-Prof. Dr. Barbara J. Jackson u. a., Assessing Pre-Literacy Behaviors in Infants and Toddlers: Psychometric Evaluation of the Infant Toddler Literacy Assessment (ITLA-3) (2022), S. 5.