Purpose Learning novel words, including the specific phonemes that make up word forms, is a struggle for many individuals with developmental language disorder (DLD). Building robust representations of words includes encoding during periods of input and consolidation between periods of input. The primary purpose of the current study is to determine differences between children with DLD and with typical development (TD) in the encoding and consolidation of word forms during the slow mapping process. Method Preschool-age children (DLD = 9, TD = 9) were trained on nine form–referent pairs across multiple consecutive training days. Children's ability to name referents at the end of training days indicated their ability to encode forms. Children's ability to name referents at the beginning of training days after a period of overnight sleep indicated their ability to consolidate forms. Word learning was assessed 1 month after training to determine long-term retention of forms. Results Throughout training, children with DLD produced fewer forms correctly and produced forms with less phonological precision than children with TD. Thus, children with DLD demonstrated impaired encoding. However, children with and without DLD demonstrated a similar ability to consolidate forms between training days and to retain forms across a 1-month delay. Conclusions Difficulties with word form learning are primarily driven by deficits in encoding for children with DLD. Clinicians and educators can support encoding by providing children with adequate exposures to target words via robust training that occurs across multiple sessions. Supplemental Material https://doi.org/10.23641/asha.16746454

Purpose: Children with typical development vary in how much experience they need to learn words. This could be due to differences in the amount of information encoded during periods of input, consolidated between periods of input, or both. Our primary purpose is to identify whether encoding, consolidation, or both, drive individual differences in the slow-mapping process. Method: Four- to 6-year-old children ( N = 43) were trained on nine form-referent pairs across consecutive days. Children's ability to name referents was assessed at the beginning and end of each session. Word learning was assessed 1 month after training to determine long-term retention. Results: Children with varying language knowledge and skills differed in their ability to encode words. Specifically, children varied in the number of words learned and the phonological precision of word forms at the end of the initial training session. Children demonstrated similarities in re-encoding in that they refined representations at a similar rate during subsequent sessions. Children did not differ in their ability to consolidate words between sessions, or in their ability to retain words over the 1-month delay. Conclusions: The amount of experience children need to learn words is primarily driven by the amount of information encoded during the initial experience. When provided with high-quality instruction, children demonstrate a similar ability to consolidate and retain words. Critically, word learning instruction in educational settings must include repeated explicit instruction with the same words to support learning in children with typical development and varying language skills. Supplemental Material: https://doi.org/10.23641/asha.19606150

Preschool-age children’s recognition of speech is more susceptible to the presence of background noise than that of older children. Because younger children rely on access to speech to learn their native language, children who are poorer at resolving degraded speech may be at risk for delayed vocabulary development. To test this relation directly, we are implementing a retrieval-based word learning task in preschool-age children. Children are taught four novel disyllabic words either in a quiet condition or in the presence of two-talker child speech (TTS) at + 10 dB-signal-to-noise ratio. Children’s performance is quantified by the number of words and the number of phonological features recalled immediately after training and after a 5-min delay. Children also complete tests of familiar word recognition in TTS, verbal working memory, and vocabulary knowledge. In this presentation, we will compare children’s word-learning outcomes between the quiet and TTS conditions and evaluate the influence of children language skills on their performance. We predict that children will have greater phonological precision of the novel words in quiet than in the presence of TTS. We also predict that children’s verbal working memory skills and vocabulary knowledge will relate to greater learning, regardless of listening condition.

Face masks worn by talkers compromise the speech signal children use to learn language. There is debate, however, about which type of face mask will be more supportive of language learning in young children. Although clear masks provide more visual access to the talker’s face than surgical masks, they distort the speech signal more than surgical masks. Our goal is to better understand the effects of different face masks on word learning in preschool-age and kindergarten-age children. To achieve this goal, we are comparing children’s ability to learn novel words in conditions that vary on the spectral fidelity of speech and visual access to the talker’s face to simulate the effects of different mask types. Children’s performance is quantified by the number of words learned and the phonological precision of words learned. To date, twelve children have completed the protocol, and the study is ongoing. We will compare children’s word-learning across conditions and evaluate the influence of individual factors such as visual speech reading skills, verbal working memory, and vocabulary knowledge on children’s performance in the various conditions. These findings will have implications for supporting word learning in young children in educational and childcare settings when masks are used.