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While there are numerous studies that investigate the amount of phonological detail associated with toddlers’ lexical representations of words and their sensitivity to mispronunciations of these words, research has only recently begun to address the mechanisms guiding the use of this detail during word recognition. The current chapter reviews the literature on experiments using the visual world paradigm to assess infant word recognition, in particular, the amount of attention infants pay to phonological detail in word recognition. We further present data from a novel study using a visual priming paradigm to assess the extent to which toddlers retrieve sub-phonemic detail during lexical access. The results suggest that both the retrieval of an object’s label and toddlers’ recognition of a word involve activation of not only phonemic but also sub-segmental information associated with the lexical representation of this word. We therefore conclude that lexical access in toddlers is mediated by sub-phonemic information.
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This paper investigated how foreign-accented stress cues affect on-line speech comprehension in British speakers of English. While unstressed English vowels are usually reduced to / @ /, Dutch speakers of English only slightly centralize them. Speakers of both languages differentiate stress by suprasegmentals (duration and intensity). In a cross-modal priming experiment, English listeners heard sentences ending in monosyllabic prime fragments—produced by either an English or a Dutch speaker of English—and performed lexical decisions on visual targets. Primes were either stress-matching (“ab” excised from absurd ), stress-mismatching (“ab” from absence ), or unrelated (“pro” from profound ) with respect to the target (e.g., ABSURD). Results showed a priming effect for stress-matching primes only when produced by the English speaker, suggesting that vowel qual- ity is a more important cue to word stress than suprasegmental information. Furthermore, for visual targets with word-initial secondary stress that do not require vowel reduction (e.g., CAMPAIGN), resembling the Dutch way of realizing stress, there was a priming effect for both speakers. Hence, our data suggest that Dutch-accented English is not harder to understand in general , but it is in instances where the language-specific implementation of lexical stress differs across languages.
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Bilingual children, like bilingual adults, co-activate both languages during word recognition and production. But what is the extent of this co-activation? In the present study, we asked whether or not bilingual preschool children activate a shared phonological cohort across languages when hearing words only in their L1. We tested German-English children on a cross-modal priming paradigm. To ensure co-activation of languages, children first heard a short code-switch story. Compared to a monolingual control group, bilingual children in Experiment 1 showed only partial sensitivity to the L1 cohort. Bilingual children who did not hear the code-switch story (Experiment 2) showed priming effects identical to the monolinguals in Experiment 1. Results indicate that under single-language contexts, German-English bilingual preschoolers do not activate the non-target language cohort during word recognition but instead restrict cohort activation to the language of input. In contrast, presentation of the non-target language in the code-switch story appears to shift cohort activation and increase L2 activation, suggesting a highly flexible language system that is in tune to the broader linguistic context. We consider mechanisms of bilingual language control that may enable bilingual toddlers to limit cross-language phonological activation.
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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.
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We examined how words from bilingual toddlers’ second language (L2) primed recognition of related target words in their first lan- guage (L1). On critical trials, prime–target word pairs were either (a) phonologically related, with L2 primes overlapped phonologically with L1 target words [e.g., slide (L2 prime)– Kleid (L1 target, ‘‘dress’’)], or (b) phonologically related through translation, with L1 translations of L2 primes rhymed with the L1 target words [e.g., leg (L2 prime, L1 translation, ‘‘Bein’’)– Stein (L1 target, ‘‘stone’’). Evidence of facilitated target recognition in the phonological priming condition suggests language nonselective access but not necessarily lexical access. However, a late interference effect on target recognition in the phonological priming through translation condition provides evidence for language nonselective lexical access: The L2 prime ( leg ) could influence L1 target recognition ( Stein ) in this condition only if both the L2 prime ( leg ) and its L1 translation (‘‘Bein’’) were concurrently activated. In addition, age- and gender-matched monolingual toddler controls showed no difference between conditions, providing further evidence that the results with bilingual toddlers were driven by cross-language activation. The current study, therefore, presents the first-ever evidence of cross-talk between the two languages of bilinguals even as they begin to acquire fluency in their second language.
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Presents a critical review of arguments in favor of and against the view that prediction is necessary for understanding language. First, potential arguments in favor of the view that prediction provides a unified theoretical principle of the human mind and that it pervades cortical function are reviewed. It is discussed whether evidence of human abilities to detect statistical regularities is necessarily evidence for predictive processing, and suggestions that prediction is necessary for language learning are evaluated. Next, arguments in support of the contrasting viewpoint are reviewed: that prediction lends a ``helping hand'', but is not strictly needed for language processing. It is pointed out that not all language users appear to predict language and that suboptimal input makes prediction often very challenging. Prediction, moreover, is argued to be strongly context-dependent and impeded by resource limitations. Furthermore, it is argued that it may be problematic that most experimental evidence for predictive language processing comes from prediction-encouraging experimental set-ups. It is concluded that languages can be learned and understood in the absence of prediction. Claims that all language processing is predictive in nature are considered to be premature.
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Do infants implicitly name visually fixated objects whose names are known, and does this information influence their preference for looking at other objects? We presented 18-month-old infants with a picture-based phonological priming task and examined their recognition of named targets in primed (e.g., dog-door) and unrelated (e.g., dog-boat) trials. Infants showed better recognition of the target object in primed than in unrelated trials across three measures. As the prime image was never explicitly named during the experiment, the only explanation for the systematic influence of the prime image on target recognition is that infants, like adults, can implicitly name visually fixated images and that these implicitly generated names can prime infants' subsequent responses in a paired visual-object spoken-word-recognition task.
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What is the relative salience of different aspects of word meaning in the developing lexicon? The current study examines the time-course of retrieval of semantic and color knowledge associated with words during toddler word recognition: At what point do toddlers orient toward an image of a yellow cup upon hearing color-matching words such as 'banana' (typically yellow) relative to unrelated words (e.g., 'house')? Do children orient faster to semantic matching images relative to color matching images, for example, orient faster to an image of a cookie relative to a yellow cup upon hearing the word 'banana'? The results strongly suggest a prioritization of semantic information over color information in children's word-referent mappings. This indicates that even for natural objects (e.g., food, animals that are more likely to have a prototypical color), semantic knowledge is a more salient aspect of toddler's word meaning than color knowledge. For 24-month-old Dutch toddlers, bananas are thus more edible than they are yellow.
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Recent research has shown that infants are sensitive to mispronunciations of words when tested using a preferential looking task. The results of these studies indicate that infants are able to access the phonological detail of words when engaged in lexical recognition. However, most of this work has focused on mispronunciations of consonants in familiar and novel words. Very little is known about the role that vowels play in constraining lexical access during the early stages of lexical development. We describe a word learning study with 14- and 18-month-old infants that tests their sensitivity to mispronunciations of word-medial vowels using a preferential looking task. We found that both age groups demonstrated recognition of correctly pronounced tokens of the newly learnt words but not mispronounced tokens. These results indicate that vowels constrain lexical access of novel words by as early as 14 months of age, and add to the growing body of literature indicating that infants exploit detailed phonological information when processing both familiar and newly learnt words.
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Although bilinguals respond differently to emotionally valenced words in their first language (L1) relative to emotionally neutral words, similar effects of emotional valence are hard to come by in second language (L2) processing. We examine the extent to which these differences in first and second language processing are due to the context in which the 2 languages are acquired: L1 is typically acquired in more naturalistic settings (e.g., family) than L2 (e.g., at school). Fifty German–English bilinguals learned unfamiliar German and English negative and neutral words in 2 different learning conditions: One group (emotion video context) watched videos of a person providing definitions of the words with facial and gestural cues, whereas another group (neutral video context) received the same definitions without gestural and emotional cues. Subsequently, participants carried out an emotional Stroop task, a sentence completion task, and a recall task on the words they had just learned. We found that the effect of learning context on the influence of emotional valence on responding was modulated by a) language status, L1 versus L2, and b) task requirement. We suggest that a more nuanced approach is required to capture the differences in emotion effects in the speed versus accuracy of access to words across different learning contexts and different languages, in particular with regard to our finding that bilinguals respond to L2 words in a similar manner as L1 words provided that the learning context is naturalistic and incorporates emotional and prosodic cues.
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We examined 7.5‐month‐old infants' ability to segment words from infant‐ and adult‐directed speech (IDS and ADS). In particular, we extended the standard design of most segmentation studies by including a phase where infants were repeatedly exposed to target word recordings at their own home (extended exposure) in addition to a laboratory‐based familiarization. This enabled us to examine infants' segmentation of words from speech input in their naturalistic environment, extending current findings to learning outside the laboratory. Results of a modified preferential‐listening task show that infants listened longer to isolated tokens of familiarized words from home relative to novel control words regardless of register. However, infants showed no recognition of words exposed to during purely laboratory‐based familiarization. This indicates that infants succeed in retaining words in long‐term memory following extended exposure and recognizing them later on with considerable flexibility. In addition, infants segmented words from both IDS and ADS, suggesting limited effects of speech register on learning from extended exposure in naturalistic environments. Moreover, there was a significant correlation between segmentation success and infants' attention to ADS, but not to IDS, during the extended exposure phase. This finding speaks to current language acquisition models assuming that infants' individual attention to language stimuli drives successful learning.
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Investigated 24-month-olds' word recognition in sentence-medial positions in two experiments using an intermodal preferential-looking paradigm. In Experiment 1, 33 French toddlers detected word-final voicing mispronunciations and compensated for native voicing assimilations in the middle of sentences. In Experiment 2, 31 English toddlers detected word-final voicing mispronunciations but did not compensate for illicit voicing assimilations. In summary, French and English 24-month-olds can take into account fine phonetic detail even if words are presented in the middle of sentences. In addition, French toddlers show language-specific compensation abilities for pronunciation variation caused by native voicing assimilation.
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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)
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Children look longer at a familiar object when presented with either correct pronunciations or small mispronunciations of consonants in the object's label, but not following larger mispronunciations. The current article examines whether children display a similar graded sensitivity to different degrees of mispronunciations of the vowels in familiar words, by testing children's sensitivity to 1-feature, 2-feature and 3-feature mispronunciations of the vowels of familiar labels: Children aged 1;6 did not show a graded sensitivity to vowel mispronunciations, even when the trial length was increased to allow them more time to form a response. Two-year-olds displayed a robust sensitivity to increases in vowel mispronunciation size, differentiating between small and large mispronunciations. While this suggests that early lexical representations contain information about the features contributing to vocalic identity, we present evidence that this graded sensitivity is better explained by the acoustic characteristics of the different mispronunciation types presented to children.
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The current study investigated the interaction of implicit grammatical gender and semantic category knowledge during object identification. German-learning toddlers (24-month-olds) were presented with picture pairs and heard a noun (without a preceding article) labeling one of the pictures. Labels for target and distracter images either matched or mismatched in grammatical gender and either matched or mismatched in semantic category. When target and distracter overlapped in both semantic and gender information, target recognition was impaired compared with when target and distracter overlapped on only one dimension. Results suggest that by 24 months of age, German-learning toddlers are already forming not only semantic but also grammatical gender categories and that these sources of information are activated, and interact, during object identification.
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The adult lexicon is organized among many representational dimensions that encode phonological, semantic and perceptual links among words. Priming studies that use behavioral, eye-tracking and electrophysiological measurements highlight the interactive and dynamic nature of lexical processing and representation in the adult lexicon. These studies suggest that word recognition routinely involves simultaneous access to other words that overlap with a spoken word on phonological, semantic or other perceptual dimensions. While these studies provide valuable information about the mechanisms guiding lexical retrieval and the factors underlying lexical organization in the lexicons of adult college-educated individuals who know many thousands of words, it is debatable the extent to which these findings can be extended to our understanding of early lexical processing in young children. On the one hand, differences in general cognitive abilities, linguistic experience and language-related knowledge in young children and college-educated adults could imply drastic differences in the way words are linked in developing and mature lexicons. On the other hand, once a word has an entry in the mental lexicon, how many or which other words the child knows may be irrelevant, such that a) the structure of the developing lexicon is a miniature version of the adult lexicon, organized according to similar dimensions; and b) the processes guiding word recognition differ minimally across development. Adjudicating between these two proposals requires examination of the structure of the early lexicon and the processes guiding lexical processing in young children. How does this structure initially develop and change as the child’s knowledge grows over time? Does the organization of the early lexicon influence subsequent word learning and word processing? Understanding these questions has the potential to inform adult theories of psycholinguistic processing and highlight important processes in early vocabulary development. This chapter will attempt to answer these questions against the background of the literature to date whilst also sketching paths for future research on the topic. (PsycINFO Database Record (c) 2018 APA, all rights reserved)
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Examined whether bilinguals implicitly generate picture labels in both of their languages when tested in their first language (L1) with a cross-modal event-related potential (ERP) priming paradigm. The results extended previous findings by showing that not only do bilinguals implicitly generate the labels for visually fixated images in both of their languages when immersed in their L1, but also that these implicitly generated labels in one language could prime recognition of subsequently presented auditory targets across languages (i.e., L2-L1). Thus, support is provided for cascaded models of lexical access during speech production as well as a new priming paradigm for the study of bilingual language processing.
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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.
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What are the processes underlying word recognition in the toddler lexicon? Work with adults suggests that, by 5-years of age, hearing a word leads to cascaded activation of other phonologically, semantically and phono-semantically related words (Huang & Snedeker, 2010; Marslen-Wilson & Zwitserlood, 1989). Given substantial differences in children’s sensitivity to phonological and semantic relationships between words in the first few years of life (Arias-Trejo & Plunkett, 2010; Newman, Samuelson, & Gupta, 2009; Storkel & Hoover, 2012), the current set of experiments investigated whether children younger than five also show such phono-semantic priming. Using a picture-priming task, Experiments 1 and 2 presented 2-year-olds with phono-semantically related prime-target pairs, where the label for the prime image is phonologically related (Experiment 1 – onset CV overlap, Experiment 2 – rhyme VC overlap) to a semantic associate of the target label. Across both experiments, toddlers recognised a word faster when this was preceded by a phono-semantically related prime relative to an unrelated prime. Overall, the results provide strong evidence that word recognition involves cascaded processing of phono-semantically related words by 2-years of age.
