Discriminative Learning and the Lexicon: NDL and LDL

Naive discriminative learning (NDL) and linear discriminative learning (LDL) are simple computational algorithms for lexical learning and lexical processing. Both NDL and LDL assume that learning is discriminative, driven by prediction error, and that it is this error that calibrates the association strength between input and output representations. Both words’ forms and their meanings are represented by numeric vectors, and mappings between forms and meanings are set up. For comprehension, form vectors predict meaning vectors. For production, meaning vectors map onto form vectors. These mappings can be learned incrementally, approximating how children learn the words of their language. Alternatively, optimal mappings representing the end state of learning can be estimated. The NDL and LDL algorithms are incorporated in a computational theory of the mental lexicon, the ‘discriminative lexicon’. The model shows good performance both with respect to production and comprehension accuracy, and for predicting aspects of lexical processing, including morphological processing, across a wide range of experiments. Since, mathematically, NDL and LDL implement multivariate multiple regression, the ‘discriminative lexicon’ provides a cognitively motivated statistical modeling approach to lexical processing.

Investigating song-based language teaching and its effect on lexical learning

<p>The present thesis addresses the following question: Can popular songs as they are currently used in second and foreign language classrooms benefit lexical learning? Lexical learning is defined as the acquisition of new vocabulary as well as the consolidation and further elaboration of familiar words and phrases. To answer this research question, three methodologically distinct studies are reported. In the first study an international questionnaire explored teacher cognitions as well as actual teaching practices involving songs. The responses of 568 informants in 41 countries indicate that a majority of respondents believe in the usefulness of songs for language learning and that many respondents utilize songs in class for clearly defined pedagogical purposes, including vocabulary learning. The questionnaire also elicited information from the respondents about the way they incorporate songs in lessons, including details about how often a song is played and what types of form- and meaning-focused activities are used to engage learners with the lyrics of a song. The second study investigated the lexical characteristics of teacher-selected songs and the vocabulary learning opportunities they afford. For this purpose, a corpus of 635 songs used for ESL/EFL purposes, comprising 177,384 tokens, was compiled and analysed. Results indicate that teacher-selected songs are short, repetitive and relatively undemanding as far as lexis is concerned compared to other authentic text genres. Knowledge of the 4000 most frequent word families of English provides 98% coverage of the running words in this song corpus. Little difference was found in terms of the overall vocabulary demands between songs intended for use with beginners, intermediate and advanced learners. The third study investigates whether participating in a song-based lesson results in higher verbatim text retention compared to a lesson based on a poem or a prose text. For the sake of ecological validity, the procedures and the materials used in the classroom intervention study were informed by the findings of the teacher questionnaire (study one) and the song corpus analysis (study two). Results indicate that a song-based language lesson but also a poem-based lesson result in significantly higher recognition and cued recall of verbatim text than a lesson based on a prose text. In response to the overall question, this thesis provides evidence that songs as they currently tend to be used by language teachers around the world indeed benefit certain aspects of lexical learning, perhaps in particular the entrenchment in memory of already (half-)familiar words in association with their phraseological patterning. It is argued that, while certain structural characteristics of songs (and poems) have the potential of rendering text (and the lexis therein) memorable, it is the way that songs tend to be exploited in the classroom that capitalizes on this mnemonic potential.</p>

Investigating song-based language teaching and its effect on lexical learning

<p>The present thesis addresses the following question: Can popular songs as they are currently used in second and foreign language classrooms benefit lexical learning? Lexical learning is defined as the acquisition of new vocabulary as well as the consolidation and further elaboration of familiar words and phrases. To answer this research question, three methodologically distinct studies are reported. In the first study an international questionnaire explored teacher cognitions as well as actual teaching practices involving songs. The responses of 568 informants in 41 countries indicate that a majority of respondents believe in the usefulness of songs for language learning and that many respondents utilize songs in class for clearly defined pedagogical purposes, including vocabulary learning. The questionnaire also elicited information from the respondents about the way they incorporate songs in lessons, including details about how often a song is played and what types of form- and meaning-focused activities are used to engage learners with the lyrics of a song. The second study investigated the lexical characteristics of teacher-selected songs and the vocabulary learning opportunities they afford. For this purpose, a corpus of 635 songs used for ESL/EFL purposes, comprising 177,384 tokens, was compiled and analysed. Results indicate that teacher-selected songs are short, repetitive and relatively undemanding as far as lexis is concerned compared to other authentic text genres. Knowledge of the 4000 most frequent word families of English provides 98% coverage of the running words in this song corpus. Little difference was found in terms of the overall vocabulary demands between songs intended for use with beginners, intermediate and advanced learners. The third study investigates whether participating in a song-based lesson results in higher verbatim text retention compared to a lesson based on a poem or a prose text. For the sake of ecological validity, the procedures and the materials used in the classroom intervention study were informed by the findings of the teacher questionnaire (study one) and the song corpus analysis (study two). Results indicate that a song-based language lesson but also a poem-based lesson result in significantly higher recognition and cued recall of verbatim text than a lesson based on a prose text. In response to the overall question, this thesis provides evidence that songs as they currently tend to be used by language teachers around the world indeed benefit certain aspects of lexical learning, perhaps in particular the entrenchment in memory of already (half-)familiar words in association with their phraseological patterning. It is argued that, while certain structural characteristics of songs (and poems) have the potential of rendering text (and the lexis therein) memorable, it is the way that songs tend to be exploited in the classroom that capitalizes on this mnemonic potential.</p>

Different effects of L1 and L2 phonology on L3 lexical learning: An ERP study

This study investigated the influence of phonological word representations from both first language (L1) and second language (L2) on third language (L3) lexical learning in L1-dominant Spanish–English bilinguals. More specifically, we used event-related potentials (ERPs) to determine whether L1 Spanish and L2 English phonology modulates bilinguals’ brain response to newly learned L3 Slovak words, some of which had substantial phonological overlap with either L1 or L2 words (interlingual homophones) in comparison to matched control words with little or no phonological overlap. ERPs were recorded from a group of 20 Spanish–English bilinguals in response to 120 auditory Slovak words, both before and after a three-day-long learning period during which they associated the L3 Slovak novel words with their L1 Spanish translations. Behaviorally, both L1 Spanish and L2 English homophony facilitated the learning of L3 Slovak words in a similar manner. In contrast, the electrophysiological results of the post-training ERPs, but not the pre-training ERPs, showed an N100 effect for L2 English interlingual homophones and opposite N400 effects for L1 Spanish and L2 English interlingual homophones in comparison to control words. These findings suggest different neurocognitive mechanisms in the use of L1 and L2 phonological information when learning novel words in an L3.

Learning academic words through writing sentences and compositions: Any signs of an increase in cognitive load?

The involvement load hypothesis (ILH), which predicts the lexical learning potential of tasks, assumes that writing sentences (SW) and compositions (CW) using novel target words (TWs) lead to similar lexical gains. However, research on the issue is scarce and contradictory. One possibility is that the higher cognitive load of CW hinders learning relative to SW. To verify the learning potential of SW and CW, we selected 20 English academic TWs and conducted a pretest–posttest quasi-experiment with Polish advanced learners of English. First, all participants wrote a control essay (without TWs), then SW participants wrote sentences and CW participants wrote two essays, each with 10 TWs. Generalized linear mixed models revealed higher gains in breadth and depth of knowledge for SW than for CW, which contradicts the predictions of the ILH. Furthermore, to detect signs of cognitive load, we derived three task-based performance measurements from the compositions: holistic scores, number of errors, and words per minute. The measurements found that the control essay and essays with TWs were of similar quality (holistic scores), but that the control essay was written faster and with fewer errors than the other two. Concluding, using TWs in essays probably increased learners’ cognitive load, slowing down their writing, generating more errors, and ultimately, decreasing learning of the TWs.

Vocabulary Acquisition and Usage for Late Talkers Treatment: Effect on Expressive Vocabulary and Phonology

Purpose This study examined the effect of Vocabulary Acquisition and Usage for Late Talkers (VAULT) treatment on toddlers' expressive vocabulary and phonology. Parent acceptability of VAULT treatment was also considered. Method We used a nonconcurrent multiple baseline single case experimental design with three late talking toddlers aged 21–25 months. The treatment was delivered twice weekly in 30-min sessions for 8 weeks by a rotating team of four speech-language pathologists. Toddlers heard three of their 10 strategically selected target words a minimum of 64 times in play activities each session. Expressive vocabulary and phonology was assessed pre–post, with parent interviews conducted posttreatment. Results All toddlers increased production of target words and expressive vocabulary. Ambient expressive vocabulary size increased by an average of 16 words per week (range of 73–169 words learned over the treatment period). On a 20-item, single-word speech assessment, the toddlers' phonetic inventories increased on average from three to seven consonants, and five to eight vowels. Two toddlers used protowords pretreatment, which were replaced by recognizable attempts at words posttreatment. Parents reported the treatment was acceptable for the child and their family with future consideration of parent-based delivery of the treatment in the home. Conclusions The results of this treatment provide further evidence of a model of intervention informed by the principles of implicit learning, and the interconnectedness of phonological and lexical learning. Investigation is required to establish the efficacy and feasibility of VAULT in clinical contexts. Supplemental Material https://doi.org/10.23641/asha.14714733

Social Inference May Guide Early Lexical Learning

We incorporate social reasoning about groups of informants into a model of word learning, and show that the model accounts for infant looking behavior in tasks of both word learning and recognition. Simulation 1 models an experiment where 16-month-old infants saw familiar objects labeled either correctly or incorrectly, by either adults or audio talkers. Simulation 2 reinterprets puzzling data from the Switch task, an audiovisual habituation procedure wherein infants are tested on familiarized associations between novel objects and labels. Eight-month-olds outperform 14-month-olds on the Switch task when required to distinguish labels that are minimal pairs (e.g., “buk” and “puk”), but 14-month-olds' performance is improved by habituation stimuli featuring multiple talkers. Our modeling results support the hypothesis that beliefs about knowledgeability and group membership guide infant looking behavior in both tasks. These results show that social and linguistic development interact in non-trivial ways, and that social categorization findings in developmental psychology could have substantial implications for understanding linguistic development in realistic settings where talkers vary according to observable features correlated with social groupings, including linguistic, ethnic, and gendered groups.