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Related Experiment Video

Updated: Oct 12, 2025

Author Spotlight: Validation of SICOLE-R for Assessing Cognitive and Reading Skills in Spanish-Speaking Children and Its Role in Personalized Education

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Published on: August 16, 2024

Words as Visual Objects: Neural and Behavioral Evidence for High-Level Visual Impairments in Dyslexia.

Heida Maria Sigurdardottir¹, Inga María Ólafsdóttir¹, Hélène Devillez¹

¹Icelandic Vision Lab, Department of Psychology, University of Iceland, Saemundargata 12, 102 Reykjavik, Iceland.

|November 27, 2021

Summary

This study explores how high-level visual deficits, not just phonological issues, may cause developmental dyslexia. Research suggests visual impairments could be a key factor in reading difficulties for some individuals.

Keywords:

dyslexia face perception high-level vision object perception reading

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Area of Science:

Neuroscience
Cognitive Psychology
Developmental Disorders

Background:

Developmental dyslexia is characterized by reading impairments disproportionate to other cognitive abilities.
Traditionally, dyslexia has been attributed to phonological deficits, impacting spoken language sound differentiation.
Reading is a complex skill relying on multiple cognitive functions, including high-level vision.

Purpose of the Study:

To propose and explore the high-level visual dysfunction hypothesis for developmental dyslexia.
To investigate how non-phonological impairments, specifically in high-level vision, might cause dyslexia.
To present evidence linking high-level visual impairments to dyslexia.

Main Methods:

Review of functional neuroimaging studies.
Analysis of structural imaging data.
Examination of electrophysiological and behavioral research.

Main Results:

Evidence suggests a connection between high-level visual impairments and dyslexia.
Functional neuroimaging, structural imaging, electrophysiology, and behavioral studies support this link.
High-level visual dysfunction may manifest as reading problems in some individuals with dyslexia.

Conclusions:

The high-level visual dysfunction hypothesis offers an alternative perspective on dyslexia.
Non-phonological visual impairments can be a significant cause of dyslexia in certain cases.
Further research integrating visual processing and reading research is warranted.