Bilingual Mental Lexicon and Collocational Processing

The chapter starts with a definition and models of mental dictionary. It then builds on the bilingual lexical activation models and goes on to discuss formulaic language (collocations in particular). After explaining the basics of formulaic language processing, the author attempts to address the issue of lexical and collocational priming theory by Hoey, which has its roots in cognitive linguistics and usage-based language models. Last but not least, some suggestions for future research are provided in an attempt to address the needs of the lexical research literature in the Turkish setting.

The role of morphological similarity in lexical activation and unintentional transfer

Aims: Within the current multilingual paradigm shift, transfer is increasingly conceptualised not only as an unintentional mechanism of “interference”, but also as an intentional mechanism used as a learner strategy. However, very little is known from an empirical perspective about (un)intentionality in transfer. This article builds on an exploratory study which suggested that background language words that fit well within the morphological constraints of the target language are highly activated during target language use and, consequently, likely to transfer unintentionally. The present study tests whether the correlation between morphological similarity and unintentionality in lexical transfer is statistically significant Methodology: A quasi-Poisson regression analysis was employed to test the significance of morphological similarity on the amount of unintentional transfer in the written production of Spanish by 78 highly multilingual school students, when tested together with additional variables (number of languages known, proficiency in the target and source languages, frequency of use, first language/second language status and psychotypology) that have also been proposed to affect lexical activation and transfer. Data and analysis: A picture-story description task was used to elicit written transfer. When a learner reported – introspectively or retrospectively – a word to have been transferred from a background language, this word was coded as an instance of intentional transfer. Reversely, non-target-like words traced back to a background language by the authors that were not commented on by the learner were coded as instances of unintentional transfer. Findings: A strongly significant ( p < 0.001), positive correlation was found between the amount of unintentional transfer and morphological similarity. A negative trend ( p < 0.1) was also found between amount of unintentional transfer and number of languages known by learners. Theoretical implications are discussed. Originality: This is one of few studies shedding light on (un)intentionality in transfer. It is also one of few studies to employ regression analysis to investigate the effect of several variables on transfer. Significance: The study provides empirical evidence to substantiate theoretical accounts of lexical activation. First, the results show that morphological similarity indeed seems to be the primary variable leading to high levels of cross-lexical activation and, second, the results show how highly activated words are more likely to be transferred unintentionally, further supporting these theoretical accounts.

Does signal reduction imply predictive coding in models of spoken word recognition?

Pervasive behavioral and neural evidence for predictive processing has led to claims that language processing depends upon predictive coding. Formally, predictive coding is a computational mechanism where only deviations from top-down expectations are passed between levels of representation. In many cognitive neuroscience studies, a reduction of signal for expected inputs is taken as being diagnostic of predictive coding. In the present work, we show that despite not explicitly implementing prediction, the TRACE model of speech perception exhibits this putative hallmark of predictive coding, with reductions in total lexical activation, total lexical feedback, and total phoneme activation when the input conforms to expectations. These findings may indicate that interactive activation is functionally equivalent or approximant to predictive coding or that caution is warranted in interpreting neural signal reduction as diagnostic of predictive coding.

Investigating the Speed of Lexical Activation in the Bilinguals' L1 and L2 through Forward and Backward Translation Task

The relationship between lexical activation in L1 and L2 was investigated using a backward and forward translation task. Bilingual Arabic-English speakers first translated forward from L1 to L2, then backward from L2 to L1. Two groups of participants were established (high and low proficient bilinguals). The translation task included words that were being translated in both L1 and L2. The goal of the study was to see how strong the relation between L1 and L2 translation is. The findings of the study revealed that bilingual memory relations are asymmetric: translation from L1 to L2 is conceptually mediated, but the translation from L2 to L1 is lexically mediated.

How does(n't) syntactic context guide auditory word recognition?

Better understanding of word recognition requires a detailed account of how top-down and bottom-up information are integrated. In this paper, we use a combination of modeling and experimental work to investigate the mechanism by which expectations from syntactic context influence the processing of perceptual input during word recognition. The distinction between facilitatory and inhibitory mechanisms for the syntactic category constraint is an important aspect of this problem that has previously been underspecified, and syntactic category is a relatively simple test case for the issue of context in other domains. We first report simulations in jTRACE that point to an explanation for conflicts that have occurred between different methods regarding the existence and timing of syntactic constraints on lexical cohort competition. We show that the composition of the set of response candidates allowed by the task is predicted to influence whether and when changes in lexical activation can be observed in dependent measures, which is relevant for the design and interpretation of experiments involving cohort competition more broadly. These insights informed a new design for the visual world paradigm that distinguishes facilitatory and inhibitory mechanisms and ensures that activation of words from the wrong syntactic category should be detectable if it is occurring. We demonstrate how failure to ensure this could have obscured such activation in previous work, leading to the appearance of an inhibitory constraint. We find that wrong-category competition does occur, a result that is incompatible with an inhibitory syntactic category constraint.

Lexical Access Changes Based on Listener Needs: Effects of Sentence Context on Real-Time Word Recognition in Cochlear Implant Users

ObjectivesOne key challenge in word recognition is the temporary ambiguity in the signal created by the fact that speech unfolds over time. Research with normal hearing (NH) listeners reveals that this temporary ambiguity is resolved through incremental processing of the signal and competition among possible lexical candidates. Post-lingually deafened cochlear implant (CI) users show similar incremental processing and competition to NH listeners but with slight delays. However, even brief delays could lead to drastic changes when compounded across multiple words in a sentence. This study asks whether words presented in non-informative sentence contexts are processed differently than words presented in isolation and whether any differences are shared among NH listeners and CI users or if the groups exhibit different patterns.DesignAcross two visual world paradigm experiments, listeners heard words presented either in isolation or in non-informative sentence contexts (“click on the…”). Listeners selected the picture corresponding to the target word from among four items including the target word (e.g., mustard), a cohort competitor (e.g., mustache), a rhyme competitor (e.g., custard), and an unrelated item (e.g., penguin). During this task, eye movements were tracked as an index of the relative lexical activation of each object type during word recognition. Subjects included 65 CI users and 48 NH controls across both experiments. ResultsBoth CI users and the NH controls were largely accurate at recognizing the words both in sentence contexts and in isolation. The time course of lexical activation (indexed by the fixations) differed substantially between groups. CI users were delayed in fixating the target relative to NH controls. Additionally, CI users showed less competition from cohorts (while previous studies have often found increased competition) compared to NH controls. However, CI users took longer to suppress the cohort and suppressed it less fully than the NH controls. For both CI users and NH controls, embedding words in sentences led to more immediacy in lexical access as observed by increases in cohort competition relative to when words were presented in isolation. However, CI users were not differentially affected by the sentencesConclusionsUnlike prior work, in both sentences and in isolated words CI users appeared to exhibit “wait-and-see” strategy, in which lexical access is delayed to minimize early competition. However, they simultaneously sustain competitor activation late in the trial possibly to preserve flexibility. This hybrid profile has not been observed previously. Both CI users and NH controls more heavily weight early information when target words are presented in sentence contexts. However, CI users (but not NH listeners) also commit less fully to the target when words are presented in sentence context potentially keeping options open if they need to recover from a misperception. This mix of patterns reflects a lexical system that is extremely flexible and adapts to fit the needs of a listener.

Effects of Age, Word Frequency, and Noise on the Time Course of Spoken Word Recognition

This study assessed the effects of age, word frequency, and background noise on the time course of lexical activation during spoken word recognition. Participants (41 young adults and 39 older adults) performed a visual world word recognition task while we monitored their gaze position. On each trial, four phonologically unrelated pictures appeared on the screen. A target word was presented auditorily following a carrier phrase (“Click on ________”), at which point participants were instructed to use the mouse to click on the picture that corresponded to the target word. High- and low-frequency words were presented in quiet to half of the participants. The other half heard the words in a low level of noise in which the words were still readily identifiable. Results showed that, even in the absence of phonological competitors in the visual array, high-frequency words were fixated more quickly than low-frequency words by both listener groups. Young adults were generally faster to fixate on targets compared to older adults, but the pattern of interactions among noise, word frequency, and listener age showed that older adults’ lexical activation largely matches that of young adults in a modest amount of noise.

Pragmatic constraints do not prevent the co-activation of alternative names: Evidence from sequential naming tasks with one and two speakers

We investigated whether the phonological co-activation of alternative names in picture naming (e.g. "fish" for target "shark") is reduced by contextual constraints which render them inappropriate. In the constraining context, the target naming response was preceded by a naming response to an object from the same category (e.g., an eel) which remained visible during target naming. Therefore, use of the alternative target name "fish" would result (a) in an ambiguous response because of the visual context and (b) in a pragmatically odd response because of the previous naming response. In Experiment 1 the context pictures were named by the participants themselves and in Experiment 2 by a communication partner. In both experiments, interference from distractor words phonologically related ("finger") versus unrelated ("book") to the alternative name was observed regardless of context. This finding indicates limited flexibility in lexical activation during speech planning.