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In conversation, interlocutors rapidly exchange well-timed turns-at-talk, generally starting to plan their contributions already during the incoming turns. Previous research showed that while this early-planning-strategy supports fast turn-taking, it comes with increased planning difficulty compared to planning after the incoming turn. The present study investigates whether concurrent planning is also detrimental to speech input comprehension, targeting the level of phonological processing. 60 subjects conducted a dual-task experiment, verbally responding to auditorily presented quiz-questions while simultaneously monitoring them for pre-specified target phonemes (60% present), pressing the space-bar upon encounter. Subjects’ monitoring performance for phonemes encountered during response planning was significantly worse than for phonemes encountered when response planning was not yet possible. Additionally, phoneme detection latencies were significantly longer when concurrently planning a verbal response than in a single-task phoneme-detection control experiment. Thus, results indicate that parallel speech planning, while common, leads to decreased input processing, possibly due to interference effects.

CogSci 2022

Reduced phonological processing during speech-planning

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CogSci 2025

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First language learners use various linguistic cues to construct their language(s)’ grammar. I study how phonological and morphological structures interact in the minds of two young learners of Russian (1;6 - 2;11 years of age) and their caretakers. While phonology is traditionally recognized to develop ahead of morphology, my data show a ‘backward’ directionality for the younger child only: the grasp of consonant cluster inventory depends on the rising morphological complexity, measured as a number of morphemes per word.
This interaction is first backed by consonant clustering, being a natural result of phonological alternations at the morpheme boundary; and second, by language pathology data, an aphasic patient attempting to improve the coda sonority in inflected words but not monomorphemic ones during speech production.
If this result is validated on a larger sample, the finding is meaningful both theoretically and practically for the speech therapy procedures.

Morphological Strengthening of Phonological Performance in Child Speech

A challenge in learning phonological grammars is learning how phonological processes interact. It has been argued that some process interactions are easier to learn than others. One basis for this argument is asymmetries observed in experimental settings: artificial languages generated from certain process interactions are more likely to be successfully reproduced by participants than others. In this paper, we argue that asymmetries in production do not necessarily provide direct support that some phonological interactions are easier to learn. Rather, we show that these asymmetries can instead emerge due to differences in the number of consistent or nearly-consistent grammars each pattern has. We present a noisy channel model of morpho-phonological learning and apply it to a recent behavioral study examining the learnability of phonological process interactions. We find that, due to the relative difference in the number of grammars that can exactly match or nearly match the observed data, the model achieves the same qualitative results as those observed in experimental settings.

Assessing the learnability of process interactions using grammatical spaces

Previous research suggests that a verb’s meaning is learned partly through the aggregated profile of syntactic frames associated with it. For example, “turn” occurs with transitive and intransitive frames in causative alternation (“He turned the car”/“The car turned”), indicating it is a causal verb. Some evidence demonstrates that young children combine multiple frames to map verbs to appropriate events. However, previous work always presented these frames together, in a single dialogue. What remains unknown is how verb learning occurs when the frames are separated, uttered in different referential contexts, as is likely in children’s everyday life. In a series of cross-situational word-learning experiments, we show that adult learners update their hypothesis about a novel verb's meaning when they encounter the verb again in a new frame, integrating their previous hypothesis about the verb’s meaning with the new frame. These results shed light on the cross-situational mechanisms of syntactic bootstrapping.

​​Learners Integrate Syntactic Frames and Semantic Hypotheses in Cross-situational Verb Learning

A central question for language development is whether very early telegraphic speech, ungrammatical but intelligible, reflects adult-like abstract linguistic competence, or instead is the result of statistical learning without the reliance on the abstract knowledge. In this paper, we develop a simulation paradigm to evaluate the predictive fit of different accounts of three-word utterances children (<20 months) produced. The simulation subjects are a) human adults with full linguistic competence, b) a statistical model that captures local statistical regularities of language input, and c) a deep neural model that learns and processes language input with global context-aware learning mechanisms. The statistical language model predicted child three-word utterances, both grammatical and ungrammatical ones, better than the neural models and even better (but not statistically) than human adults. The findings suggest simple local statistical regularities underlying child early telegraphic speech.

Key Open Door: Simulating Children’s Early Three-word Utterances Reveals Simple Statistical Regularities Underlying Telegraphic Speech

Elicited imitation is a widely used method for testing a child's knowledge of a language for scientific or clinical purposes. A child hears an utterance and is asked to repeat what they have heard. While it is assumed that their fluency or speed in doing so is contingent on their linguistic competence, little is known about the cognitive mechanisms and/or representations involved. To explore this, we train an encoder-decoder model, consisting of recurrent neural networks, to encode and reproduce a corpus of child-directed speech and then test its performance on the experimental task of Bannard and Matthews (2008). In that study pre-school children were asked to repeat high- and low-frequency four-word sequences in which the first three words were identical (e.g., sit in your chair and sit in your truck) and the final words and bigrams were closely matched for frequency. We find that like those children our model makes more errors on the initial three words when they are part of a low-frequency than a high-frequency sequence, despite the fact that the words being repeated are identical. We explore why this might be and pinpoint some possible similarities between the model and child language processing.

Modelling Children's Sentence Recall using an Encoder-Decoder Network

Query-Based Memory (QBM) models are heavily used in machine learning, though their relevance to human cognition is unclear. In this paper, we explore QBM models through both formal exploration and a simulation study to address this question. We found that QBM models are theoretically motivated, as they approximate rational induction with neurally-plausible mechanisms. Additionally, a simple implementation of the model could readily reproduce four benchmark findings in infant statistical learning. These results provide an encouraging starting point for further research using these formal tools to understand cognition across development.

Query-Based Memory Approximates Rational Induction: Applications to Infant Statistical Learning

Zipf’s law asserts that words form a power law distribution: word frequency is inversely proportional to rank. Relatively recent cognitive and usage-based linguistics argue that speech differs structurally from writing. Except for a few older analyses performed on tiny corpora, studies of Zipf’s law prior to 2021 have been done on written corpora and use informal methods to determine Zipfianness. 
We argue that recent work indicating that transcribed speech forms a Zipfian distribution can be extended to the speech of traditionally developing children. Further, we show that the transcribed speech of children with a clinical diagnosis of autism spectrum disorder is non-Zipfian. These judgements are made using formal statistical techniques developed in Clauset (2009). They include the Kolmogorov-Smirnov statistic for goodness-of-fit and likelihood ratio to rule out other distributions.

A First Look at Zipf's Law and the Speech of Children with Autism Spectrum Disorder

Individuals with Williams Syndrome (WS) display an unusual cognitive profile with severe deficits in spatial skills along with fluent and arguably complex language. Our experiment focused on the comprehension of scalar expressions, such as `some', `two', and `or' as a window to study their semantic and pragmatic competence. We compared performance of individuals with WS (mean age = 16,4 (year, month), age range = 11,10-21,11) to children matched by Mental Age (MA, (mean age = 6,1, age range = 5,2-7,8) and typical adults. No differences between the WS and MA groups were found in their knowledge of truth conditions of scalar terms. We further tested whether participants accept the statements with scalar terms in contexts featuring their logical (semantic) readings. Individuals with WS accepted logical readings more often than children matched by MA, suggesting that individuals with WS have access to the abstract meaning of scalar expressions.

Understanding of Linguistic Scales in Speakers with Williams Syndrome

Semantic representations of words can vary from person to person and can undergo change over the lifespan. Although a number of studies have explored differences in affective variables (e.g. valence), there has not been any large-scale investigation of the way socio-semantic information is represented, nor whether there is variation (or stability) in these representations across a diverse participant sample. We report on a study where 2,700 Czech words were rated by 1,450 Czech speakers along the dimensions of gender (feminine/masculine), location (rural/urban), political alignment (conservative/liberal), valence (negative/positive) and age (old/young). The ratings were analysed based on gender and age demographics. Our results demonstrate that distinct categories of words, e.g. those associated with mental wellbeing (such as úzkost [anxiety]) are self-associated – young participants rate the words as more young, older participants as more old. Our results shed light on the variation that exists in socio-semantic representations within different populations.

Exploring age and gender differences in socio-semantic representations of words

Polarity-sensitivity is a typologically general linguistic phenomenon. We focus on negative polarity items (NPIs, e.g. English 'any') -- expressions that are licensed only in negative contexts. The relevant notion of 'negative context' could be defined lexically, syntactically or semantically. There is psycholinguistic evidence in favour of semantics as a driving factor for some NPIs in a couple of languages (Chemla, Homer, & Rothschild, 2011; Denić, Homer, Rothschild, & Chemla, 2021). Testing the scale of this analysis as a potential cross-linguistic universal experimentally is extremely hard. We turn to recent multilingual pre-trained language models -- multilingual BERT (Devlin, Chang, Lee, & Toutanova, 2018) and XLM-RoBERTa (Conneau et al., 2019) -- and evaluate the models' recognition of polarity-sensitivity and its cross-lingual generality. Further, using the artificial language learning paradigm, we look for the connection in neural language models between semantic profiles of expressions and their ability to license NPIs. We find evidence for such connection for negation but not for other items we study.

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Morphological Strengthening of Phonological Performance in Child Speech

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