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Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Prosopagnosia

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Intellectual Disability01:29

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Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
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Dyslexia
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Related Experiment Video

Updated: Jul 6, 2026

Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading
05:54

Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading

Published on: October 18, 2018

Developmental dyslexia.

Jean-François Démonet1, Margot J Taylor, Yves Chaix

  • 1INSERM U455, Hôpital Purpan, IFR 96, Toulouse, France. demonet@toulouse.inserm.fr

Lancet (London, England)
|May 4, 2004
PubMed
Summary

Developmental dyslexia, a specific reading disability, has biological origins and often involves phonological disorders. Neuroimaging reveals altered brain activity and connectivity in individuals with dyslexia, which can improve with interventions.

Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Psychology

Background:

  • Developmental dyslexia, or specific reading disability, affects children with normal intelligence and sensory abilities, manifesting as reading deficits.
  • Evidence points to a biological origin and a prevalence of phonological disorders, despite significant variability in presentation and co-occurring conditions.
  • Existing theories explore the cognitive and neurological underpinnings of dyslexia.

Purpose of the Study:

  • To summarize the current understanding of the biological, genetic, and neurological aspects of developmental dyslexia.
  • To highlight findings from genetic and neuroimaging studies concerning dyslexia.
  • To discuss the implications of brain activity changes in response to reading interventions.

Main Methods:

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Last Updated: Jul 6, 2026

Eye-tracking to Distinguish Comprehension-based and Oculomotor-based Regressive Eye Movements During Reading
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Published on: October 18, 2018

Assessing Dyslexia at Six Year of Age
15:00

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

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09:00

Advancing Dyslexia Assessment in Children Through Computerized Testing

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  • Review of genetic studies identifying loci associated with specific reading disability.
  • Analysis of neuroimaging studies examining brain activity and connectivity in individuals with dyslexia.
  • Examination of research on the effects of remedial interventions on brain function.

Main Results:

  • Genetic studies indicate multiple loci influence dyslexia, but direct symptom-locus correlations remain elusive.
  • Neuroimaging reveals impaired activity and connectivity in language-critical brain regions (e.g., left fusiform gyrus) in individuals with dyslexia.
  • Brain activity changes are observed following remedial interventions, suggesting potential for improvement.

Conclusions:

  • Developmental dyslexia is a biologically rooted disorder with a significant phonological component.
  • Neurological differences, including altered brain function and connectivity, are characteristic of dyslexia.
  • Interventions can positively impact brain activity patterns associated with reading in individuals with dyslexia.