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Related Concept Videos

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.
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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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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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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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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Related Experiment Video

Updated: May 13, 2025

Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Right Hemisphere Language Network Plasticity in Aphasia.

Peter E Turkeltaub1,2, Kelly C Martin1,3, Alycia B Laks1,2

  • 1Center for Brain Plasticity and Recovery, Center for Aphasia Research and Rehabilitation, Departments of Neurology and Rehabilitation Medicine, Georgetown University Medical Center, Washington, DC, USA.

Medrxiv : the Preprint Server for Health Sciences
|April 29, 2025
PubMed
Summary

The right hemisphere plays a role in aphasia recovery by recruiting language networks, particularly in the chronic phase after stroke. This recruitment involves both existing connections and new areas, aiding in language function recovery.

Keywords:
brain plasticityneuroplasticityneurorehabilitationremappingstroke recovery

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurolinguistics

Background:

  • The role of the right hemisphere in aphasia recovery is debated, with prior studies yielding conflicting results.
  • Previous research suggested right hemisphere recruitment depends on lesion severity and diminishes over time, but these findings were questioned due to methodological limitations.

Purpose of the Study:

  • To investigate the mechanisms and extent of right hemisphere language network recruitment in chronic stroke survivors with aphasia.
  • To clarify whether right hemisphere engagement reflects upregulation of existing pathways or recruitment of new neural nodes.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) with a semantic decision task in 76 chronic stroke survivors and 69 healthy adults.
  • The fMRI paradigm was designed to elicit reliable left-lateralized language activation and adapt to individual performance levels.
  • Analyzed relationships between right hemisphere activation, lesion characteristics, demographic factors, and aphasia severity.

Main Results:

  • Stroke survivors showed greater right hemisphere activation than controls, linked to younger age, left-handedness, and higher education.
  • Right hemisphere activation was modest, unrelated to lesion size, and increased with longer time since stroke.
  • Specific right hemisphere regions (ventral inferior frontal, mid-anterior temporal) showed increased activation post-stroke, correlating with improved naming and word reading, while dorsal inferior frontal cortex activation increased but did not relate to outcomes.

Conclusions:

  • Right hemisphere language networks are recruited in the chronic phase of aphasia recovery, supporting both upregulation of existing nodes and recruitment of new ones.
  • Findings clarify mechanisms of right hemisphere plasticity in aphasia and may inform targeted neuromodulatory treatments for stroke survivors.