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Category: Project

Description: Research in the past showed that momentarily blocking parts of the mouth involved in articulating speech sounds could disrupt the perception of those sounds in preverbal infants (Bruderer et al., 2015; Choi et al., 2019). Later, our lab found evidence that long-term pacifier use was associated with smaller vocabulary sizes in 12- and 24-month-old infants and that this was worse for pacifier use later in age (Munoz et al. under review). The present study aims to replicate our previous findings with direct measures of vocabulary size and concurrent measures of pacifier use rather than long-term retrospective recall as in Muñoz et al. (under review). We used two measures of word comprehension, (a) an intermodal preferential-looking eye-tracking paradigm, and (b) parental reported vocabulary size in comprehension and production through the Norwegian version of the Communicative Development Inventory (CDI).