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Organization of the Brain01:30

Organization of the Brain

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The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
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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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Anatomy of the Brain: Major Regions01:20

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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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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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Related Experiment Video

Updated: Jul 5, 2025

Modeling the Functional Network for Spatial Navigation in the Human Brain
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Grid codes underlie multiple cognitive maps in the human brain.

Dong Chen1, Nikolai Axmacher2, Liang Wang1

  • 1CAS Key Laboratory of Mental Health, Institute of Psychology, 100101, Beijing, China; Department of Psychology, University of Chinese Academy of Sciences, 100101, Beijing, China.

Progress in Neurobiology
|January 17, 2024
PubMed
Summary
This summary is machine-generated.

Grid cells, fundamental for spatial navigation, show remarkable progress in human studies and computational models. Research now integrates these findings, exploring their role in brain function and disease.

Keywords:
Cognitive mapComputational modelGrid codesNavigation

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Grid cells, discovered in rodents, form equilateral triangular patterns in 2D space.
  • Recent research explores human grid-like representations and computational models of grid cell function.

Approach:

  • This review synthesizes empirical human studies and cognitive computational models of grid codes.
  • It integrates findings from spatial navigation research and efficient coding principles.

Key Points:

  • Human grid-like representations exist in both physical and abstract spaces.
  • Cognitive models highlight efficient and predictive coding roles for grid cells.
  • Grid codes are implicated in the entorhinal cortex and medial prefrontal cortex.

Conclusions:

  • The review provides a systematic organization of recent advances in grid cell research.
  • It discusses the neural mechanisms and disease relevance of grid codes in humans.