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Related Concept Videos

Language and Cognition01:27

Language and Cognition

348
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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Lateralization01:28

Lateralization

337
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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Cerebral Hemispheres01:05

Cerebral Hemispheres

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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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Neuroplasticity01:01

Neuroplasticity

364
Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

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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.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
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Cerebrum: Anatomical Overview II01:11

Cerebrum: Anatomical Overview II

1.7K
Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Updated: Jul 6, 2025

Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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White matter plasticity during second language learning within and across hemispheres.

Xuehu Wei1, Thomas C Gunter1, Helyne Adamson1

  • 1Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig 04103, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|January 4, 2024
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Adult second language learning reshapes brain networks. New white matter connections form within hemispheres, while connections between hemispheres decrease, correlating with improved language skills.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Cognitive Science

Background:

  • Adult second language (L2) acquisition induces brain plasticity.
  • Understanding structural changes in L2 language networks remains limited.

Purpose of the Study:

  • Investigate longitudinal changes in white matter (WM) language networks during adult L2 learning.
  • Examine hemispheric and interhemispheric network alterations and their correlation with L2 proficiency.

Main Methods:

  • Longitudinal study of Arabic-speaking adults learning German intensively over 6 months.
  • Analysis of white matter (WM) connectivity changes in language networks using neuroimaging techniques.

Main Results:

  • Significant increase in WM-connectivity within bilateral temporal-parietal semantic and phonological subnetworks.
  • Increased WM-connectivity in right temporal-frontal pathways, particularly in the latter learning phase.
  • Significant decrease in interhemispheric WM-connectivity, potentially involving the corpus callosum.
  • Correlation between observed WM-connectivity changes and L2 performance.

Conclusions:

  • Adult L2 learning involves dynamic reconfiguration of structural language networks.
  • Changes suggest network adaptation for lexical processing and potential lateralization effects.
  • Reduced interhemispheric connectivity may facilitate L2 acquisition by modulating inhibition.