Toward a speech-motor account of the effect of Age of Pacifier Withdrawal
Overusing the pacifier in infancy affects abstract word processing later in life. In previous studies, we showed that using the pacifier for more than 3 years of age affects the conceptual relations used to define the meaning of words at age 6. Similarly, in semantically categorizing a set of abstract, concrete and emotional words, 8-years old children who used the pacifier for a longer period were slower in processing abstract stimuli, but not concrete and emotional ones. Children of both studies have a typical development and no diagnosis of cognitive or linguistic disorders. Here, we propose an account of the effect of Age of Pacifier Withdrawal (APW) within the DIVA neurocomputational model of speech development and production (Guenther, F.H., & Vladusich, T. (2013). A Neural Theory of speech acquisition and production. Journal of Neurolinguistics, 25 (5), 408-422.). Using the pacifier for a longer period during social interaction might hinder proprioceptive information and speech-motor program (limiting the co-articulation of speech) as well as auditory input (as the child receives an inaccurate input of his/her own speech). We suggest that auditory speech representation might be worth exploring in children using the pacifier for more than three years of age.