The Influence of Articulatory Suppression on Reading Among Chinese Children With Developmental Dyslexia: An Eye-Movement Study

Objective: The study aimed to examine how the phonological loop influences reading ability and processing in Chinese children with developmental dyslexia (DD).Methods: This study included 30 children with DD and 37 children without DD. Two types of articles (i.e., scenery prose and narrative story) and two conditions (under the conditions of articulatory-suppression and silent reading) were applied. An eye-link II High-Speed Eye Tracker was used to track a series of eye-movement parameters. The data were analyzed by the linear Mixed-Effects model.Results: Compared with children without DD, Children with DD had lower reading achievement (RA), frequency of saccades (FS) and frequency of fixations (FF), longer reading time (RT) and average fixation duration (AFD), slower reading speed (RS), shorter average saccade amplitude (ASA) and fixation distance (FD), more number of fixations (NF), and number of saccades (NS). There were significant interactions between participant group and articulatory suppression on RT and FD. We also observed interaction effects between article types and articulatory suppression on RA, AFD, ASA, and FS.Conclusion: Children DD exhibit abnormal phonological loop and eye movements while reading. The role of articulatory suppression on reading varies with the presentation of DD and the article type.

EXPRESS: Articulatory suppression delays processing of abstract words: the role of inner speech

Compared to concrete concepts, like “book”, abstract concepts expressed by words like “justice” are more detached from sensorial experiences, even though they are also grounded in sensorial modalities. Abstract concepts lack a single object as referent and are characterized by higher variability both within and across participants. According to the Word as Social Tool (WAT) proposal, owing to their complexity, abstract concepts need to be processed with the help of inner language. Inner language can namely help participants to re-explain to themselves the meaning of the word, to keep information active in working memory, and to prepare themselves to ask information from more competent people. While previous studies have demonstrated that the mouth is involved during abstract concepts’ processing, both the functional role and the mechanisms underlying this involvement still need to be clarified. We report an experiment in which participants were required to evaluate whether 78 words were abstract or concrete by pressing two different pedals. During the judgment task, they were submitted, in different blocks, to a baseline, an articulatory suppression, and a manipulation condition. In the last two conditions, they had to repeat a syllable continually and to manipulate a softball with their dominant hand. Results showed that articulatory suppression slowed down the processing of abstract more than that of concrete words. Overall results confirm the WAT proposal’s hypothesis that abstract concepts processing involves the mouth motor system and specifically inner speech. We discuss the implications for current theories of conceptual representation.

Difficulty in Writing Perceived by University Students: A Comparison of Inaccurate Writers with and without Diagnostic Certification

Research has shown that academic success is strongly associated with positive academic self-efficacy beliefs and that individuals with learning disabilities (LDs) usually report a lower perception of competence than their peers in most learning domains. The aim of this study was two-fold: (1) To compare the performance of inaccurate writers who were not diagnosed with an LD with that of students who were diagnosed with an LD, in order to identify which tasks were the most challenging for individuals with LDs, and (2) to investigate whether inaccurate writers with and without a diagnosis differ in terms of self-perceived difficulties. Two groups were selected from a total sample of 639 students attending seven Italian universities: The first group included 48 participants (24 females) with scores on writing tasks below the 5th percentile, and the second included 51 participants (24 females) who were diagnosed with an LD. The results showed that the two groups significantly differed in the articulatory suppression condition tasks, but not in the standard condition tasks. When groups were matched for performance on writing tasks, students who were diagnosed with an LD reported significantly more perceived difficulties than students without an LD. The implications of these results in terms of the self-efficacy beliefs of students with an LD are discussed.

“Textual Prosody” Can Change Impressions of Reading in People With Normal Hearing and Hearing Loss

Recently, dynamic text presentation, such as scrolling text, has been widely used. Texts are often presented at constant timing and speed in conventional dynamic text presentation. However, dynamic text presentation enables visually presented texts to indicate timing information, such as prosody, and the texts might influence the impression of reading. In this paper, we examined this possibility by focusing on the temporal features of digital text in which texts are represented sequentially and with varying speed, duration, and timing. We call this “textual prosody.” We used three types of textual prosody: “Recorded,” “Shuffled,” and “Constant.” Recorded prosody is the reproduction of a reader’s reading with pauses and varying speed that simulates talking. Shuffled prosody randomly shuffles the time course of speed and pauses in the recorded type. Constant prosody has a constant presentation speed and provides no timing information. Experiment 1 examined the effect of textual prosody on people with normal hearing. Participants read dynamic text with textual prosody silently and rated their impressions of texts. The results showed that readers with normal hearing preferred recorded textual prosody and constant prosody at the optimum speed (6 letters/second). Recorded prosody was also preferred at a low presentation speed. Experiment 2 examined the characteristics of textual prosody using an articulatory suppression paradigm. The results showed that some textual prosody was stored in the articulatory loop despite it being presented visually. In Experiment 3, we examined the effect of textual prosody with readers with hearing loss. The results demonstrated that readers with hearing loss had positive impressions at relatively low presentation speeds when the recorded prosody was presented. The results of this study indicate that the temporal structure is processed regardless of whether the input is visual or auditory. Moreover, these results suggest that textual prosody can enrich reading not only in people with normal hearing but also in those with hearing loss, regardless of acoustic experiences.

The Influence of Articulatory Suppression on Reading Among Chinese Children with Developmental Dyslexia: An Eye-Movement and Case-Control Study

Background: In Western countries, phonological processing deficit was regard as a core deficit in developmental dyslexia (DD). As Chinese is a logographic language, it’s still controversial whether and how the articulatory suppression influences reading ability and processing of Chinese children with DD. The study aimed to examine how the phonological loop influences reading ability and processing in Chinese children with DD.Methods: This study included 30 children with DD and 37 children without DD. Two types of articles (i.e., scenery prose and narrative story) and two conditions (under the conditions of articulatory-suppression and silent reading) were applied. An eye-link II High-Speed Eye Tracker was used to track a series of eye-movement parameters. The data was analyzed by the linear Mixed-Effects model. Results: Compared with children without DD, Children with DD had lower reading achievement (RA), frequency of saccades (FS) and frequency of fixations (FF), longer reading time (RT) and average fixation duration (AFD), slower reading speed (RS), shorter average saccade amplitude (ASA) and fixation distance (FD), more number of fixations (NF) and number of saccades (NS). There were significant interactions between participant group and articulatory suppression on RT and FD. We also observed interaction effects between article types and articulatory suppression on RA, AFD, ASA, and FS.Conclusion: Children DD exhibit abnormal phonological loop and eye movements while reading. The role of the articulatory suppression on reading varies with the presentation of DD and the article type.

Population-level differences in the neural substrates supporting Statistical Learning

The ability to extract regularities from the environment is arguably an adaptive characteristic of intelligent systems. In the context of speech, statistical word-learning is thought to be an important mechanism for language acquisition. By taking into account individual differences in speech auditory-motor synchronization, an independent component analysis of fMRI data reveals that the neural substrates of this cognitive ability are not shared across individuals. While a network of auditory and superior pre/motor regions is universally activated to produce learning, a fronto-parietal network is instead additionally and selectively engaged by some individuals, boosting their performance. Interfering with the use of this network via articulatory suppression (producing irrelevant speech during learning) normalizes performance across the entire sample. Crucially, the engagement of this network predicts speech auditory-motor synchrony, directly relating this cognitive skill with language abilities.

The Relationship Between Language and Planning in Children With Language Impairment

Purpose This study examined the relationship between language and planning, a higher order executive function skill, in children with specific language impairment (SLI) and typically developing (TD) children. We hypothesized differences between groups in planning performance and in the role of verbal mediation during planning. Method Thirty-one children with SLI and 50 TD age-matched peers (8–12 years) participated in the study. We assessed language ability via a standardized language measure and planning via a dual-task Tower of London paradigm with 3 conditions: no secondary task (baseline), articulatory suppression secondary task (disrupted verbal mediation), and motor suppression secondary task (control for secondary task demand). Results We found similar overall accuracy between children with SLI and TD peers on the Tower of London. Children with SLI executed trials more slowly at baseline than TD peers but not under articulatory suppression, and children with SLI spent less time planning than TD children at baseline and under articulatory suppression. There was a significant interaction among group, language ability, and planning time under articulatory suppression. Children with SLI who had relatively better language ability spent less time planning than children with SLI who had poorer language ability when verbal mediation was disrupted. This pattern was reversed for TD children. Conclusions This study provides evidence for a relationship between language and planning, yet this relationship differed between children with SLI compared to TD peers. Findings suggest that children with SLI use nonlinguistic perceptual strategies to a greater degree than verbal strategies on visuospatial planning tasks and that intervention might address strategy use for planning.

When scenes speak louder than words: Verbal encoding does not mediate the relationship between scene meaning and visual attention

The complexity of the visual world requires that we constrain visual attention and prioritize some regions of the scene for attention over others. The current study investigated whether verbal encoding processes influence how attention is allocated in scenes. Specifically, we asked whether the advantage of scene meaning over image salience in attentional guidance is modulated by verbal encoding, given that we often use language to process information. Sixty subjects studied 30 scenes for 12 seconds each in preparation for a scene recall task. Thirty of the subjects engaged in a secondary articulatory suppression task (digit repetition) concurrent with scene viewing. Meaning and saliency maps were quantified for each of the 30 scenes. In both conditions we found that meaning explained more of the variance in visual attention than image salience did, particularly when we controlled for the overlap between meaning and salience. Based on these results, verbal encoding processes do not appear to modulate the relationship between scene meaning and visual attention, or to play a role in encoding scenes for later recall. Our findings suggest that semantic information in the scene steers the attentional ship, consistent with cognitive guidance theory.

Articulatory Suppression Impairs Working Memory for Ostensibly Unvocalizable Abstract Sounds

Both subvocal articulatory rehearsal and attentional refreshing have been advanced as rehearsal mechanisms for verbal material (including speech sounds) in working memory, but the mechanism of rehearsal for nonverbal sounds—especially timbral attributes of sounds—remains unclear. Since timbral attributes of sounds often have been assumed to be unvocalizable, researchers have suggested that working memory for timbre must involve an attentional or sensory (rather than subvocal) maintenance mechanism. Two experiments examined the role of subvocal rehearsal and attentional refreshing in working memory for timbre using sounds that were designed to be abstract, unvocalizable, and devoid of apparent mnemonic semantic connections. Participants heard either three (Experiment 1) or two (Experiment 2) brief (250 ms), abstract sounds. Following an 8000 ms retention interval, participants heard a single probe sound and indicated whether the probe had been a member of the original set. During the retention interval, manipulations were introduced to suppress subvocal articulatory rehearsal, attentional refreshing, or both. Across both experiments, all conditions with articulatory suppression during the retention interval showed worse memory performance than a control condition. Effects of attentional refreshing suppression were inconsistent. These experiments suggested that subvocal imitation may be an important mechanism of rehearsal in working memory for timbre—a finding that presents complications for existing theoretical perspectives on both verbal and nonverbal working memory.

The Motor System's [Modest] Contribution to Speech Perception

Recent evidence suggests that the motor system may have a facilitatory role in speech perception during noisy listening conditions. Studies clearly show an association between activity in auditory and motor speech systems, but also hint at a causal role for the motor system in noisy speech perception. However, in the most compelling "causal" studies performance was only measured at a single signal-to-noise ratio (SNR). If listening conditions must be noisy to invoke causal motor involvement, then effects will be contingent on the SNR at which they are tested. We used articulatory suppression to disrupt motor-speech areas while measuring phonemic identification across a range of SNRs. As controls, we also measured phoneme identification during passive listening, mandible gesturing, and foot-tapping conditions. Two-parameter (threshold, slope) psychometric functions were fit to the data in each condition. Our findings indicate: (1) no effect of experimental task on psychometric function slopes; (2) a small effect of articulatory suppression, in particular, on psychometric function thresholds. The size of the latter effect was 1 dB (~5% correct) on average, suggesting, at best, a minor modulatory role of the speech motor system in perception.