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Related Concept Videos

Language and Cognition01:27

Language and Cognition

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.
Learning Disabilities01:25

Learning Disabilities

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.
Dyslexia
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Scanning Dos and Don'ts: Using Magnetic Resonance Imaging in Awake Children Aged 3 to 5 Years to Assess Brain Structure and Function
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Brain imaging findings in dyslexia.

Ying-Fang Sun1, Jeun-Shenn Lee, Ralph Kirby

  • 1Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan. d49420009@ym.edu.tw

Pediatrics and Neonatology
|April 27, 2010
PubMed
Summary

Brain imaging studies reveal structural and functional differences in individuals with dyslexia, offering insights into the disorder beyond behavioral analysis. These findings, primarily from Caucasian subjects, highlight potential neural underpinnings of dyslexia.

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Published on: May 1, 2020

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Medical Imaging

Background:

  • Dyslexia is a prevalent neurodevelopmental disorder with significant social impact, extensively studied in Western populations.
  • Chinese communities lack formal diagnosis and recognition of dyslexia, despite its global presence.
  • Previous research focused on reading deficits, often overlooking non-linguistic skills and visual-spatial talents in dyslexic individuals.

Purpose of the Study:

  • To review and synthesize findings from brain imaging studies on dyslexia.
  • To explore the neural correlates of dyslexia based on studies predominantly involving Caucasian subjects.
  • To provide a comprehensive overview of how neuroimaging advances our understanding of dyslexia's underlying mechanisms.

Main Methods:

  • Structural magnetic resonance imaging (sMRI) for gray matter deficits.
  • Functional magnetic resonance imaging (fMRI) for neural activity patterns.
  • Magnetic resonance spectroscopy (MRS) for biochemical changes.
  • Diffusion tensor imaging (DTI) for white matter integrity.
  • Positron emission tomography (PET) and electroencephalography (EEG) for brain activation.
  • Magnetoencephalography (MEG) for brain activity and asymmetry.

Main Results:

  • sMRI shows gray matter deficits in dyslexic brains.
  • fMRI reveals reduced activity in left temporal/parietal regions and altered cerebellar activation.
  • MRS detects changes in metabolites like lactate and N-acetylaspartate.
  • DTI indicates lower fractional anisotropy in white matter tracts.
  • PET and EEG show abnormal Broca's area activation and increased right frontal/temporal activity, respectively.
  • MEG reports reduced hemispheric asymmetry and increased left inferior frontal activation.

Conclusions:

  • Neuroimaging techniques provide valuable insights into the neurobiological basis of dyslexia.
  • These modalities offer a deeper understanding of dyslexia's causes than traditional behavioral or cognitive studies.
  • While not yet diagnostic, brain imaging advances our knowledge of dyslexia's complex neural underpinnings.