Dyslexia in a consistent orthography: Evidence from reading-level match design

Area of Science:

• Developmental psychology
• Educational psychology
• Linguistics

Background:

• Previous studies on dyslexia using reading-level (RL) matching in consistent orthographies yielded conflicting results.
• Issues with general ability and RL matching in prior research may explain discrepancies.

Purpose of the Study:

• To investigate dyslexia in Greek-speaking children using rigorous matching criteria.
• To compare the performance of dyslexic children with chronological age (CA) and RL matched controls on core dyslexia-related tasks.

Main Methods:

• Participants included Grade 4 and 6 Greek-speaking children with dyslexia and carefully matched control groups (CA and RL).
• Matching considered both verbal and nonverbal abilities, and reading tasks had no ceiling effects.
• Performance was assessed across phonological awareness, rapid naming, phonological memory, and orthographic processing.

Main Results:

• Both Grade 4 and Grade 6 dyslexic groups performed significantly worse than their CA matched controls on most tasks.
• Crucially, dyslexic children did not perform worse than their RL matched peers on any of the assessed tasks.

Conclusions:

• The findings support the effectiveness of the RL match design in consistent orthographies when general ability is controlled.
• Results have implications for understanding the cognitive profile of dyslexia and refining research methodologies.