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Updated: Jun 21, 2026

Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Letter and letter-string processing in developmental dyslexia.

Maria De Luca¹, Cristina Burani, Despina Paizi

¹Neuropsychology Unit, IRCCS Fondazione Santa Lucia, Rome, Italy. m.deluca@hsantalucia.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|July 28, 2009

Summary

This summary is machine-generated.

Italian developmental dyslexics show significant impairments in both letter recognition and word reading tasks. A "letter-string" factor indicates a severe reading deficit, while a separate "letter" factor suggests a milder, independent impairment.

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Area of Science:

Cognitive Psychology
Neuroscience
Developmental Psychology

Background:

Developmental dyslexia is a common learning disorder affecting reading acquisition.
Understanding the underlying cognitive deficits is crucial for targeted interventions.
Letter recognition and word reading processes are fundamental to reading proficiency.

Purpose of the Study:

To investigate letter recognition and word reading abilities in Italian developmental dyslexics.
To differentiate between global and specific processing impairments in dyslexia.
To explore the relationship between letter processing and word reading deficits.

Main Methods:

Evaluated letter/bigram recognition (naming, matching) and word/non-word reading in dyslexic and skilled readers.
Utilized the Rate and Amount (RAM) model to analyze performance differences.
Applied z-score transformation to control for global factor influences and detect specific effects.

Main Results:

Dyslexics were significantly slower than skilled readers across all tasks.
Identified two global factors: a severe "letter-string" factor (reading) and a mild "letter" factor (recognition).
Specific effects revealed that stimulus length and word complexity disproportionately impacted dyslexic performance.

Conclusions:

Developmental dyslexia involves distinct, independent impairments in letter processing and word reading.
The "letter-string" deficit significantly affects reading, influenced by stimulus length and word type.
These findings contribute to a nuanced understanding of the cognitive architecture of dyslexia.