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Related Concept Videos

Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Language and Cognition01:27

Language and Cognition

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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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Cerebral Hemispheres01:05

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
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Learning Disabilities01:25

Learning Disabilities

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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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Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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Updated: May 22, 2025

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound fTCD
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The lateralization of reading.

Jason J S Barton1, Andrea Albonico2, Randi Starrfelt3

  • 1Departments of Medicine (Neurology), Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, BC, Canada.

Handbook of Clinical Neurology
|March 12, 2025
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Summary
This summary is machine-generated.

Reading primarily relies on the left hemisphere

Keywords:
AlexiaBrailleDevelopmental dyslexiaLogographicSplit brainWord

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Linguistics

Background:

  • Historical reports from the 1890s linked reading disorders to left hemisphere damage.
  • Extensive research confirms the left ventral occipitotemporal cortex's crucial role in reading.
  • The leftward bias in reading develops with acquisition and is impaired in dyslexia.

Purpose of the Study:

  • To review the neurobiological basis of reading, focusing on hemispheric lateralization.
  • To explore the involvement of the left ventral occipitotemporal cortex in diverse reading forms.
  • To examine how different writing systems and non-verbal reading modalities affect brain activation.

Main Methods:

  • Review of neuroimaging studies (fMRI, PET) investigating reading processes.
  • Analysis of behavioral data from reading acquisition and dyslexia research.
  • Comparative analysis of studies using alphabetic, logographic, and other symbolic systems.

Main Results:

  • The left ventral occipitotemporal cortex is consistently activated during reading of alphabetic scripts.
  • Reading logographic scripts like Chinese shows subtle differences in hemispheric involvement.
  • Diverse reading forms, including sign language, Braille, musical notation, and number reading, also engage the left ventral occipitotemporal cortex, with variable right hemisphere contributions.

Conclusions:

  • Reading exhibits a strong leftward hemispheric bias, primarily involving the left ventral occipitotemporal cortex.
  • This bias is fundamental to reading acquisition and is disrupted in developmental dyslexia.
  • The left ventral occipitotemporal cortex plays a central role in processing various symbolic information, extending beyond traditional verbal reading.