Journal of Neurolinguistics最新文献

Children with autism spectrum disorder (ASD) often have difficulties in communication with others, which may derive from limitations in their understanding of pragmatic language. In this study, we used the Conversational Violations Test (CVT) with children with ASD and typically developing (TD) children in order to examine their sensitivity to violations of the Gricean maxims: be relevant (maxim of Relation), be truthful (maxim of Quality), be informative (Quantity I), avoid redundancy (Quantity II), and be polite (maxim of Politeness). These maxims have an important role in communication. We found that TD children performed better than children with ASD on the CVT. We also found that children with ASD had higher total CVT scores with increasing chronological age. We discuss the developmental trajectories of pragmatic language understanding in children with ASD.

During reading, we can process words allocated to the parafoveal visual region. Our ability to extract parafoveal information is determined by the availability of attentional resources, and by how these are distributed among words in the visual field. According to the foveal load hypothesis, a greater difficulty in processing the foveal word would result in less attentional resources being allocated to the parafoveal word, thereby hindering its processing. However, contradictory results have raised questions about which foveal load manipulations may affect the processing of parafoveal words at different levels. We explored whether the semantic processing of parafoveal words can be modulated by variations in a frequency-based foveal load. When participants read word triads, modulations in the N400 component indicated that, while parafoveal words were semantically processed when foveal load was low, their meaning could not be accessed if the foveal word was more difficult to process. Therefore, a frequency-based foveal load modulates semantic parafoveal processing and a semantic preview manipulation may be a suitable baseline to test the foveal load hypothesis.

In an ever-changing environment such as a situation with a variety of linguistic information, individuals have to adapt by selecting the most relevant and appropriate information. In event-related potential studies that manipulated the syntactic agreement between a subject and a verb, it was shown that morphosyntactic features (e.g., number or person feature) are used to compute syntactic dependencies. Furthermore, statistical language information seemed to play a role in the production of subject-verb agreement. We thus investigated flexibility in the processing of morphosyntactic features and co-occurrence frequency between a subject and its verbal inflection. Pronoun primes and verbal targets were presented auditorily and the flexibility of the representations in French subject-verb agreement was studied by manipulating the task to be performed on the target. In Experiment 1, the task was a lexical decision task to induce the use of co-occurrence frequency between a subject and its verbal inflection; in Experiment 2, the task was a grammatical categorization task to amplify the use of morphosyntactic features. Results showed that statistical information affected the processing of the verb earlier than the use of morphosyntactic features, whose violation produced the classic biphasic reaction with negativity followed by positivity. Our findings suggest that there is flexibility in the use of both statistical and abstract morphosyntactic feature representations, although the flexibility of the use of features depends more on task strategies.

Difficulties in sentence processing have been reported in patients with Mild Cognitive Impairment (MCI), which may be due to impairment in primary syntactic abilities or short-term memory. In the present study, we investigated the relationship between overt sentence production (SP) and comprehension (SC) with short-term memory performance in MCI. Cognitively healthy elderly (n = 34), amnestic MCI (aMCI,n = 22), non-amnestic MCI (naMCI,n = 45), and Alzheimer's disease (AD,n = 18) patients were asked to complete tests of constrained SP and oral SC. We tested the association between performance in SP and SC with memory tasks and performed a qualitative analysis of the frequency and type of errors in SC. Our results showed that there were no intergroup differences in SC and SP performances. SC scores were associated with delayed recall for words in the naMCI group (p = 0.003), and immediate (p = 0.001) and delayed recall for shapes (p = 0.031) in AD. There were no predictors for NAT scores in any group. In conclusion, the three groups performed similarly in SC and SP tasks. Short-term memory was not associated with performance in the SP task. There was an association between performance in the SC task and verbal memory in naMCI and non-verbal memory in AD; the latter may reflect visuospatial processing demands embedded in the SC task.

Verbal fluency tests are easy and quick to use in neuropsychological assessments. The aim of this study is to explore their relevance through a bibliometric analysis. We performed a search in the Web of Science, involving documents published between 1960 and 2021. We used bibliometric indicators to explore articles distribution, doubling time, and annual growth. We calculated the participation index of the different countries and institutions. Through bibliometric mapping, we explored the co-occurrence networks for the most frequently used terms in verbal fluency research. 1718 articles were found, distributed in two different periods (1960–1995 and 1995 to 2021), the second one containing more than 88% of the documents. Price's law shows an exponential growing. Literature on verbal fluency has grown at a rate of 6,7% per year, doubling its size every 10.7 years. Bradford's law shows a high concentration of articles published in a small core of specialized journals. Finally, the map network visualization shows a change in the most important topic related to verbal fluency during the most recent period analysed. Verbal fluency task has undergone an exponential growth. Its easy application, its sensitivity to different brain dysfunction, the possibility of implementation with neuroimaging studies, and the potential analysis of more complex components (clustering or switching) might have played a key role in its growing interest.

People with Parkinson's disease often experience communication problems. The current cross-linguistic study investigates how listeners' perceptual judgements of speech healthiness are related to the acoustic changes appearing in the speech of people with Parkinson's disease. Accordingly, we report on an online experiment targeting perceived healthiness of speech. We studied the relations between healthiness perceptual judgements and a set of acoustic characteristics of speech in a cross-sectional design. We recruited 169 participants, who performed a classification task judging speech recordings of Dutch speakers with Parkinson's disease and of Dutch control speakers as ‘healthy’ or ‘unhealthy’. The groups of listeners differed in their training and expertise in speech language therapy as well as in their native languages. Such group separation allowed us to investigate the acoustic correlates of speech healthiness without influence of the content of the recordings.

We used a Random Forest method to predict listeners' responses. Our findings demonstrate that, independently of expertise and language background, when classifying speech as healthy or unhealthy listeners are more sensitive to speech rate, presence of phonation deficiency reflected by maximum phonation time measurement, and centralization of the vowels. The results indicate that both specifics of the expertise and language background may lead to listeners relying more on the features from either prosody or phonation domains. Our findings demonstrate that more global perceptual judgements of different listeners classifying speech of people with Parkinson's disease may be predicted with sufficient reliability from conventional acoustic features. This suggests universality of acoustic change in speech of people with Parkinson's disease. Therefore, we concluded that certain aspects of phonation and prosody serve as prominent markers of speech healthiness for listeners independent of their first language or expertise. Our findings have outcomes for the clinical practice and real-life implications for subjective perception of speech of people with Parkinson's disease, while information about particular acoustic changes that trigger listeners to classify speech as ‘unhealthy’ can provide specific therapeutic targets in addition to the existing dysarthria treatment in people with Parkinson's disease.

Introduction

This study aimed to further clarify the roles of the temporal and frontal lobes of the brain in the processing of verb argument structure. Left inferior frontal brain areas have long been considered important for sentence processing, but recent research links left posterior temporal cortex to knowledge of verb argument structure.

Methods

We applied cathodal High-Definition transcranial Direct Current Stimulation to 45 participants in a between-subjects design, with 15 participants each for inferior-frontal-cortex stimulation, posterior-temporal-cortex stimulation, and sham stimulation. Set up as a training task during stimulation, participants made overt judgments on the number of participant roles associated with individual verbs.

Results

Stimulation of posterior temporal cortex did not yield results that were different from sham stimulation, speeding up task responses overall. By contrast, stimulation of inferior frontal cortex yielded differential results for intransitive versus transitive verbs, speeding up responses to intransitive verbs and increasing accuracy to transitive verbs, relative to other conditions.

Conclusion

The transitivity effect, specific to inferior frontal stimulation, suggests a role for inferior frontal cortex in access to verb-argument-structure information, possibly specific to situations of high cognitive load and in which participant roles have to be established for production, as opposed to comprehension.

Cross cultural neuroimaging work has demonstrated differences in neural correlates of some cognitive processes between individuals from different cultures, often comparing American and Chinese subjects. In contrast, a limited number of studies examined Arab and/or Filipino participants. This fMRI study aimed to demonstrate neural activations during animal and tool picture naming by 18 healthy Arabs and 18 healthy Filipino participants. In animal naming contrasted with tool naming, Arabs preferentially activated regions in the right lateral occipital and fusiform cortices, whereas Filipinos recruited bilateral visual areas. Cross-group comparisons of animal naming revealed that Arabs recruited right visual areas more than Filipinos, who in turn recruited the cerebellum more than Arabs. In tool naming, Arabs preferentially activated a predominantly left frontoparietal network, whereas no regions were identified in Filipinos, and no differences in activation between groups were found. Using a low-demand picture-naming task, this study revealed category-specific neural activations during picture naming by Arabs and Filipinos, as well as between-group differences in animal naming. The results suggest that Arabs and Filipinos may have culture-specific differences in processing animate and inanimate pictures, and caution against generalizing findings from the more commonly studied populations, especially in verbal tasks such as picture naming.

All speakers must monitor their speech for errors. However, few studies have investigated speech monitoring in bilinguals. We examined whether monolinguals and bilinguals differ in first (L1) and second (L2) language speech monitoring. Participants included 18 English monolinguals, 20 English-French and 21 French-English sequential bilinguals who learned their two languages one after the other, and 15 simultaneous bilinguals who learned their two languages from birth. All participants performed an English phoneme substitution task while an electroencephalogram (EEG) was recorded. Three event-related brain potential (ERP) components were analyzed: the stimulus-locked P200 and N200, and the response-locked error-related negativity. All groups performed the task equally well despite showing differences in ERP patterns on correct and incorrect trials. Only simultaneous bilinguals showed a larger P200 preceding incorrect compared to correct responses, suggesting a role for lexical activation processes in the production of speech errors. All language groups showed evidence of pre-articulatory, conflict-based error monitoring through the N200. Only French-English sequential bilinguals, in their L2, showed a reliable ERN effect following speech errors. Thus, speech error monitoring processes were found to be influenced by whether one is speaking in their L1 versus L2 depending on the stage of monitoring, with response conflict being more informative for post-articulatory error monitoring during L2 compared to L1 speech production.

Aphasia is one of the most common deficits occurring after stroke that remains, at least in part, even after speech therapy and medication treatment. Non-invasive direct current transcranial stimulation (tDCS) is used to improve brain function by induction of neural plasticity. This study investigated the effect of bi-hemispheric tDCS on verbal function in patients with stroke-induced Broca's aphasia.

Thirty patients with Broca's aphasia due to ischemic stroke, referred to an academic hospital in Guilan Province, Iran, in 2019-20, were studied. Patients were divided into two groups receiving seven sessions of either active or sham tDCS. The tDCS sessions began 10–20 days after stroke onset. The severity of aphasia before and after the intervention and a 3-month follow-up were assessed by the Persian version of the Western Battery-1 test (P-WAB-1). T-test, ANOVA, and Repeated Measurement were used for data analyses.

The mean P-WAB-1 score was significantly higher in the intervention group both early after tDCS (P ≤ 0.0001) and on the 3-months follow-up (P ≤ 0001). Linear regression analysis indicated that tDCS had a positive effect on verbal performance scores independent of age, sex, and lesion volume (Regression coefficient = −33.3).

Bi-hemispheric tDCS effectively improves verbal function in Broca's aphasia in the sub-acute phase of ischemic stroke.