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Related Concept Videos

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Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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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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Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Assessing Dyslexia at Six Year of Age
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Dyslexia: Causes and Concomitant Impairments.

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  • 1Institute for Social Pediatrics and Adolescent Medicine, Ludwig-Maximilians-University of Munich, Haydnstr. 5, D-80336 München, Germany.

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|March 29, 2023
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Summary

The causes of dyslexia, or impaired reading, stem from missing necessary conditions or insufficient sufficient conditions. Specific reading issues include incorrect fixation and processing speed, potentially linked to visual cortex impairments.

Keywords:
attention spancausationdyslexiaeye movementsreading impairmentsimultaneous recognitionvisual cortexvisual word form area

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Developmental Psychology

Background:

  • Theories on dyslexia causes are abundant, yet a clear understanding of 'cause' in this context is lacking.
  • Previous research has not precisely defined the causal factors contributing to dyslexia.

Purpose of the Study:

  • To propose a conceptual framework for understanding the causes of impaired reading.
  • To identify specific conditions and impairments contributing to dyslexia.

Main Methods:

  • Conceptual analysis of the concept of 'cause' in relation to reading impairment.
  • Identification of specific oculomotor and visual processing deficits associated with dyslexia.

Main Results:

  • Dyslexia is proposed to result from the absence of necessary conditions or all sufficient conditions for reading.
  • Identified causes include incorrect fixation location, short fixation duration, and impaired visual processing in areas V1, V2, V3, and the fusiform gyrus.
  • Impaired temporal summation and simultaneous letter processing in visual areas are hypothesized to cause longer fixation times in dyslexic readers.

Conclusions:

  • A precise understanding of causality is crucial for dyslexia research.
  • Specific visual processing and oculomotor factors are identified as potential causes of dyslexia.
  • The development of compensatory reading strategies can improve reading ability despite underlying impairments.