Assessing Phonology, Syntax & Working Memory using ERP: Towards an Understanding of the Underlying Cause of Developmental Dyslexia
Bibliographic record
Abstract
Event-related brain potentials (ERPs) were recorded from 20 children with dyslexia and controls matched on age, sex, nonverbal reasoning, and handedness (ages 8-12 years) as they listened to and read sentences that varied in syntactic complexity and the working memory load they induced [subject-subject (SS) and subject-object (SO) relative clause sentences]. In each modality, control children demonstrated amplitude differences between the brainwave potentials elicited to each sentence type. When listening, controls, and children with dyslexia did not differ in the N400 effect elicited in response to the relative verb of SO sentences, thus indicating auditory sentential processing occurred in a similar manner for both groups of children early in the sentences. However, by the later main verb region of SO sentences, thematic role assignment, as indexed by the left anterior negativity (LAN), was absent in children with dyslexia, suggested that rather than syntactic complexity, overtaxed working memory inhibited dyslexics’s ability to assign thematic roles. When reading, the N400 effect was again demonstrated by each group at the relative clause of SO sentences; however children with dyslexia exhibited a latency delay in comparison to control children. Similar to auditory processing at the main verb, while reading only the control goup demonstrated LAN effects in response to SO sentence structure. In order to investigate working memory capacity in more temporal detail, slow cortical potentials were measured over the full duration of the sentence. Results demonstrated that while both groups were able to utilize phonological working memory to store sentential information when listening to sentences, only controls could reliably do so when reading. The data indicates that the syntactic deficits inherent in dyslexia are mediated by phonological working memory. These results support the phonological limitation hypothesis posited by Shankweiler et al. (1992), which contends that all impediments related to dyslexia are mediated by a primary deficit in phonological processing.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".