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Related Concept Videos

Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
Organization of the Brain01:30

Organization of the Brain

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.
Hindbrain
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Functional Brain Systems: Limbic System

The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Anatomy of the Brain: Major Regions

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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Functional Divisions of the Nervous System

The nervous system, responsible for sensing, integrating, and responding to various stimuli, is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS has two functional divisions: the sensory or afferent division and the motor or efferent division.
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Hierarchy of Motor Control01:18

Hierarchy of Motor Control

The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.

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Related Experiment Video

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Modeling the Functional Network for Spatial Navigation in the Human Brain
05:55

Modeling the Functional Network for Spatial Navigation in the Human Brain

Published on: October 13, 2023

Hierarchical modularity in human brain functional networks.

David Meunier1, Renaud Lambiotte, Alex Fornito

  • 1Brain Mapping Unit, Department of Psychiatry, University of Cambridge Cambridge, UK.

Frontiers in Neuroinformatics
|December 2, 2009
PubMed
Summary
This summary is machine-generated.

Human brain networks exhibit a hierarchical modular structure, revealing consistent organization across individuals. This finding supports theories on complex systems and brain function adaptability.

Keywords:
braingraph theoryhierarchyinformationmodularitynear-decomposabilitynetwork

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Area of Science:

  • Neuroscience
  • Network Science
  • Systems Biology

Background:

  • The concept of hierarchical modularity in complex systems, proposed in the 1960s, is gaining traction with network science.
  • Understanding the brain's functional organization is crucial for neuroscience.

Purpose of the Study:

  • To investigate the hierarchical modular decomposition of human brain functional networks.
  • To assess the similarity of this modular structure across individuals.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) data from 18 healthy volunteers at rest.
  • A customized template for network extraction with over 1800 regional nodes.
  • A fast algorithm for identifying nested modular structures and mutual information for community structure similarity.

Main Results:

  • Human brain functional networks demonstrate a hierarchical modular organization with significant inter-subject similarity (I = 0.63).
  • Key modules identified include medial occipital, lateral occipital, central, parieto-frontal, and fronto-temporal systems.
  • Occipital modules showed less sub-modular organization compared to association cortex modules; connector nodes and hubs were concentrated in association areas.

Conclusions:

  • Computationally efficient algorithms enable hierarchical modular decomposition of high-resolution brain functional networks.
  • This approach facilitates future research into the adaptive benefits of hierarchical organization in complex systems, aligning with Simon's hypothesis.