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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...
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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.
Hindbrain
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Functional Brain Systems: Limbic System01:15

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...
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...
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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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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.

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Related Experiment Video

Updated: Jul 3, 2026

Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
12:09

Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy

Published on: August 5, 2014

Consistency and functional specialization in the default mode brain network.

Ben J Harrison1, Jesus Pujol, Marina López-Solà

  • 1Institut d'Alta Tecnologia-Parc de Recerca Biomèdica de Barcelona, CRC Corporació Sanitària, 08003 Barcelona, Spain. habj@unimelb.edu.au

Proceedings of the National Academy of Sciences of the United States of America
|July 16, 2008
PubMed
Summary
This summary is machine-generated.

The default mode network shows consistent anatomy across rest and cognitive tasks. Specific brain regions within this network are modulated differently by moral dilemmas and the Stroop task.

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Last Updated: Jul 3, 2026

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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
10:43

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Published on: July 1, 2014

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Human Neuroimaging

Background:

  • The default mode network (DMN) is a set of brain regions showing prominent activity during resting states.
  • Understanding the DMN's function is crucial for interpreting human neuroimaging studies.
  • Debate exists regarding the precise definition and functional role of default brain modes.

Purpose of the Study:

  • To demonstrate the consistency and specialization of the default mode network.
  • To map spontaneous and task-related brain activity within the DMN.
  • To constrain the functional meaning of the default mode network.

Main Methods:

  • Three functional magnetic resonance imaging (fMRI) experiments were conducted.
  • Activity fluctuations were analyzed during eyes-closed rest, moral dilemma tasks, and Stroop task performance.
  • Correlated activity and regional modulations within the DMN were identified across conditions.

Main Results:

  • Consistent anatomical structure of the default mode network was observed across all imaging states.
  • Both moral dilemma and Stroop tasks differentially modulated DMN activity compared to rest.
  • Moral dilemma tasks elicited regionally specific increases in DMN activity with hypothesized functional relevance.

Conclusions:

  • The default mode network exhibits both anatomical consistency and functional specialization.
  • Task engagement differentially impacts the DMN, distinguishing it from resting-state activity.
  • Mapping DMN activity during various states refines our understanding of its role in cognition and brain function.