„Even in a well-educated country such as Germany, at the age of 26 months disparities in vocabulary development by maternal education are already visible and that – associated with maternal education – children experience different frequencies of language-related joint attention episodes as a facet of language stimulating interaction behavior of their mothers.“
Dr. Anja Linberg u. a., Social disparities in the vocabulary of 2-year-old children and the mediating effect of language-stimulating interaction behavior (2020), S. 28.