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Recent studies suggest that infants’ audiovisual speech perception is influenced by articulatory experience (Mugitani et al., 2008; Yeung & Werker, 2013). The current study extends these findings by testing if infants’ emerging ability to produce native sounds in babbling impacts their audiovisual speech perception. We tested 44 6-month-olds on their ability to detect mismatches between concurrently presented auditory and visual vowels and related their performance to their productive abilities and later vocabulary size. Results show that infants’ ability to detect mismatches between auditory and visually presented vowels differs depending on the vowels involved. Furthermore, infants’ sensitivity to mismatches is modulated by their current articulatory knowledge and correlates with their vocabulary size at 12 months of age. This suggests that—aside from infants’ ability to match nonnative audiovisual cues (Pons et al., 2009)—their ability to match native auditory and visual cues continues to develop during the first year of life. Our findings point to a potential role of salient vowel cues and productive abilities in the development of audiovisual speech perception, and further indicate a relation between infants’ early sensitivity to audiovisual speech cues and their later language development.

Early Word Learning explores the overlapping and interactive processes leading to young children learning words and their meanings. Experts in the field review the development of early lexical acquisition, starting with an infant's learning of native speech sounds, to segmenting proto-words from fluent speech, mapping individual words to meanings in the face of natural variability and uncertainty, and developing a structured mental lexicon. Drawing on cutting-edge research in infant eye-tracking, neuroimaging techniques and computational modelling, this book surveys the field covering both established results and the most recent advances in word learning research. The chapters combine empirical, computational and theoretical perspectives, to provide a comprehensive yet coherent and unified representation of early word learning, spanning the first two years of life. It is essential reading for both undergraduate and postgraduate courses in early language development and developmental psycholinguistics as well as researchers in these fields. (PsycINFO Database Record (c) 2018 APA, all rights reserved)

While American English infants typically segment words from fluent speech by 7.5-months, studies of infants from other language backgrounds have difficulty replicating this finding. One possible explanation for this cross-linguistic difference is that the input infants from different language backgrounds receive is not as infant-directed as American English infant-directed speech (Floccia et al., 2016). Against this background, the current study investigates whether German 7.5- and 9-month-old infants segment words from fluent speech when the input is prosodically similar to American English IDS. While 9-month-olds showed successful segmentation of words from exaggerated IDS, 7.5-month-olds did not. These findings highlight (a) the beneficial impact of exaggerated IDS on infant speech segmentation, (b) cross-linguistic differences in word segmentation that are based not just on the kind of input available to children and suggest (c) developmental differences in the role of IDS as an attentional spotlight in speech segmentation.