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Related Concept Videos

Lateralization01:28

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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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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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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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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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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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Brain executive laterality and hemisity.

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  • 1Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii.

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Summary
This summary is machine-generated.

A new study identifies brain laterality, specifically the larger side of the anterior cingulate cortex (ACC), as a sixth lateralized function. This "hemisity" is genetically based and stable throughout life, influencing individual characteristics and behaviors.

Keywords:
Brain lateralityCorpus callosumHemisityRight or left brain orientation

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Area of Science:

  • Neuroscience
  • Human Genetics
  • Cognitive Science

Background:

  • Brain laterality, the asymmetric organization of brain functions, is established for handedness, language, spatial skills, facial, and emotion recognition.
  • A sixth lateralized element, the larger hemisphere of the anterior cingulate cortex (ACC), has been identified, potentially representing the executive system's final output.

Purpose of the Study:

  • To introduce and validate a new concept of "hemisity" as a binary measure of brain laterality.
  • To establish reliable methods for determining hemisity and explore its relationship with other biological and behavioral factors.

Main Methods:

  • Hemisity determination using nine biophysical tests and five behavioral questionnaires.
  • Validation of hemisity through Magnetic Resonance Imaging (MRI) correlation with ACC asymmetry (r=0.96).
  • Analysis of 2929 individuals, including high school students, to assess hemisity stability, prevalence, and correlations.

Main Results:

  • Hemisity is a stable, genetically influenced trait, present from infancy to old age, unrelated to handedness.
  • A significant correlation (r=0.96) was found between determined hemisity and the larger side of the ACC via MRI.
  • Individuals were categorized as 38% right-brain oriented and 62% left-brain oriented, with larger corpus callosum (CC) size in right-brainers.

Conclusions:

  • Hemisity, defined by ACC asymmetry, represents a fundamental aspect of brain laterality.
  • This binary brain orientation influences numerous individual characteristics and behaviors.
  • Further research into hemisity may reveal insights into dominance patterns and heritability in pairings.