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Related Concept Videos

Cerebral Hemispheres01:05

Cerebral Hemispheres

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...
Lateralization01:28

Lateralization

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.
Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

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...
Cerebrum: Anatomical Overview II01:11

Cerebrum: Anatomical Overview II

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...
Cerebrum: Anatomical Overview I01:26

Cerebrum: Anatomical Overview I

The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...

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Explaining function with anatomy: language lateralization and corpus callosum size.

Goulven Josse1, Mohamed L Seghier, Ferath Kherif

  • 1Wellcome Trust Centre for Neuroimaging, UCL, London WC1N 3BG, UK. gjosse@fil.ion.ucl.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 26, 2008
PubMed
Summary
This summary is machine-generated.

Larger corpus callosum (CC) size correlates with stronger left-hemisphere language lateralization. This study links CC anatomy to functional brain organization, offering new insights into interhemispheric communication.

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Area of Science:

  • Neuroscience
  • Neuroanatomy
  • Cognitive Neuroscience

Background:

  • The corpus callosum (CC) connects brain hemispheres, and its size is theorized to reflect interhemispheric fiber count.
  • Previous studies on CC size and functional lateralization yielded inconsistent results.
  • No prior research directly linked CC size to functional lateralization using neuroimaging data.

Purpose of the Study:

  • To investigate the relationship between corpus callosum size and functional language lateralization.
  • To determine if CC anatomy predicts the degree of hemispheric specialization for language.

Main Methods:

  • Combined anatomical CC measurements with functional magnetic resonance imaging (fMRI) language activation data.
  • Analyzed data from 74 healthy subjects, controlling for confounding factors like handedness, gender, age, and global white matter volume.
  • Assessed language lateralization by measuring left vs. right hemisphere activation during language tasks.

Main Results:

  • A larger midsagittal surface area of the corpus callosum was associated with increased left-lateralization of language functions.
  • This effect was observed in posterior temporal and inferior frontal regions.
  • Increased CC size correlated with greater left-hemisphere activation and reduced right-hemisphere activation in specific language areas.

Conclusions:

  • Provides the first direct evidence in healthy individuals linking corpus callosum size to the degree of functional language lateralization.
  • Suggests that CC anatomy plays a role in modulating interhemispheric communication for language processing.
  • Highlights the importance of structural brain connectivity in functional brain organization.