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Related Experiment Video

Updated: May 10, 2026

Advancing Dyslexia Assessment in Children Through Computerized Testing

Advancing Dyslexia Assessment in Children Through Computerized Testing

Published on: August 16, 2024

Morphological processing in reading disabled and skilled Spanish children.

Miguel Lázaro¹, Lourdes Camacho, Cristina Burani

¹University of Castilla la Mancha, Department of Psychology, Talavera de la Reina, Spain. miguel.lazaro@uclm.es

Dyslexia (Chichester, England)

|June 27, 2013

Summary

Skilled child readers matched by age, not vocabulary, showed faster and more accurate responses in a lexical decision task. Only these skilled readers benefited from the base frequency (BF) effect, indicating its importance in reading development.

Keywords:

base frequency children dyslexia morphological processing morphology

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Area of Science:

Cognitive Psychology
Developmental Psychology
Linguistics

Background:

The base frequency (BF) effect, where frequent word bases facilitate processing, is a key area in understanding reading.
Investigating the BF effect in children with reading disorders and different groups of skilled readers provides insight into reading development and challenges.

Purpose of the Study:

To examine the base frequency (BF) effect in children with reading disorders compared to age-matched and vocabulary-matched skilled readers.
To determine how chronological age and vocabulary size influence the BF effect in reading development.

Main Methods:

A lexical decision experiment was conducted with three groups: children with reading disorders, age-matched skilled readers, and vocabulary-matched skilled readers.
Participants responded to stimuli based on the frequency of their base forms, measuring reaction times and accuracy.

Main Results:

Significant effects were found for participant group, base frequency (BF), and their interaction.
Age-matched skilled readers were faster and more accurate than other groups.
Only age-matched skilled readers demonstrated a significant benefit from the BF effect.

Conclusions:

Reading-disabled children's performance is distinct from skilled readers, even when matched for vocabulary.
Chronological age appears more critical than vocabulary size for benefiting from the BF effect in reading.
Findings inform theories of morphological processing and the role of experimental tasks in reading research.