Boder's dyslexia subtypes as a severity continuum with a definitional route axis - A behavioural companion to harmonised qEEG cross-spectra.

The traditional dyslexia subtypes behaved more like overlapping points on continuous dimensions than separate natural groups, which may support more individualized research approaches.

Chiarenza GA, Peluso V, Bosch-Bayard J.
International journal of psychophysiology : official journal of the International Organization of Psychophysiology · Publication date: 2026-10-04
Added to site: 2026-10-06
DOI: 10.1016/j.ijpsycho.2026.113486

Published online October 4, 2026. Added October 6, 2026.

Modalities

QEEG, EEG

Clinical focus

Developmental dyslexia, Dimensional classification

Population

Children assessed for developmental dyslexia subtypes

Sample

520 children for behavioral analysis; companion qEEG subset of 227 children

Intervention / method

Computerized reading and spelling measures were tested for natural clusters, severity and route discrimination; the abstract compares these findings with published qEEG cross-spectral connectivity

Comparator

Dysphonetic, dyseidetic and mixed labels defined by the reading and spelling algorithm

Clinician summary

Behavioral features did not form label-aligned clusters. Reading time mainly reflected the defining severity measure, while qEEG connectivity separated behaviorally defined DD and DYD labels in the companion sample with AUC 0.85.

How to interpret the findings

This was not a treatment study. The qEEG result comes from a companion analysis of the same source cohort and predicts behaviorally defined labels; it does not independently validate a latent subtype, diagnose dyslexia or establish clinical benefit. Full methods, device details and disclosures were not checked.

Equipment and disclosures

qEEG acquisition and analysis equipment were not reported in the checked abstract.

Crossref lists German Research Foundation funding. Full-text funding and conflict disclosures were not checked.

Related evidence

Compare findings from the same clinical area, including mixed results.