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Related Experiment Video
Updated: Jul 2, 2026

Assessing Dyslexia at Six Year of Age
Published on: May 1, 2020
Developmental surface dyslexias.
1Language and Brain Lab, School of Education, Tel Aviv University, Tel Aviv, Israel. naamafr@post.tau.ac.il
This study identifies three subtypes of developmental surface dyslexia based on distinct lexical route impairments. Potentiophones, words with multiple sound conversions, presented the highest reading aloud error rates for all participants.
Area of Science:
- Neuroscience
- Psycholinguistics
- Developmental Psychology
Background:
- Surface dyslexia is characterized by reliance on grapheme-to-phoneme conversion due to lexical route deficits.
- Impairments in the lexical route can occur at various stages, leading to different reading difficulties.
- Understanding these subtypes is crucial for targeted interventions in developmental dyslexia.
Purpose of the Study:
- To identify and differentiate subtypes of developmental surface dyslexia based on locus of impairment within the lexical route.
- To analyze the distinct performance patterns of these subtypes in lexical decision and homophone comprehension tasks.
- To investigate the role of potentiophones in reading aloud errors among individuals with surface dyslexia.
Main Methods:
- Recruited seventeen Hebrew-speaking individuals with developmental surface dyslexia (aged 10-43).
- Classified participants into three subtypes based on performance in lexical decision and homophone comprehension tasks.
- Analyzed reading aloud errors, focusing on regularizations and the impact of potentiophones.
Main Results:
- Identified three subtypes: input surface dyslexia (impaired orthographic input lexicon), orthographic lexicon output surface dyslexia (impaired output to phonological/semantic systems), and interlexical surface dyslexia (impaired lexicon connection).
- Each subtype exhibited unique patterns in lexical decision and homophone comprehension.
- Potentiophones resulted in the highest error rates during reading aloud for all participants with surface dyslexia.
Conclusions:
- Developmental surface dyslexia comprises distinct subtypes with specific underlying lexical processing deficits.
- The nature of the lexical route impairment significantly influences performance on various reading-related tasks.
- Potentiophone identification and processing represent a significant challenge for individuals with surface dyslexia, impacting reading accuracy.

