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Diencephalon: Thalamus and Information Relay01:27

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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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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There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen.
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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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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 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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Related Experiment Video

Updated: Mar 25, 2026

Inter-Brain Synchrony in Open-Ended Collaborative Learning: An fNIRS-Hyperscanning Study
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Dynamic interactions between the cerebral hemispheres.

Giorgio M Innocenti1

  • 1Department of Neuroscience, Karolinska Institutet, Retzius väg 8, 17177, Stockholm, Sweden. Giorgio.Innocenti@ki.se

Experimental Brain Research
|August 8, 2008
PubMed
Summary
This summary is machine-generated.

The corpus callosum

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Area of Science:

  • Neuroscience
  • Neurobiology
  • Cognitive Neuroscience

Background:

  • The two cerebral hemispheres communicate through the corpus callosum.
  • Understanding interhemispheric communication is crucial for brain function.

Purpose of the Study:

  • To review recent findings on how visual areas in different hemispheres interact.
  • To explore the role of the corpus callosum in controlling hemispheric dynamics.

Main Methods:

  • Review of recent animal and human studies.
  • Analysis of stimulus-dependent and stimulus-specific interactions.
  • Examination of excitatory and inhibitory inputs.

Main Results:

  • Visual areas in both hemispheres dynamically control each other.
  • Interactions involve stimulus-specific excitatory and inhibitory pathways.
  • Synchronous neuronal assemblies form across and within hemispheres.

Conclusions:

  • Callosal axon geometry correlates with stimulus-driven neuronal assembly formation.
  • This study provides the first direct link between connectional geometry and neural assembly dynamics.
  • Findings support a computational role for axonal geometry in interhemispheric visual processing.