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Related Concept Videos

Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
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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...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
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...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...

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Related Experiment Video

Updated: May 26, 2026

Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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Published on: April 15, 2015

Cortical circuits: finding balance in the brain.

Joshua H Siegle1, Christopher I Moore

  • 1MIT Department of Brain and Cognitive Sciences, 77 Massachusetts Avenue, Building 46, Room 5233, Cambridge, MA 02142, USA. jsiegle@mit.edu

Current Biology : CB
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Brain inhibition quickly controls new excitation bursts in the neocortex. This study used optogenetics to demonstrate how this balance is maintained for healthy brain function.

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Area of Science:

  • Neuroscience
  • Brain function

Background:

  • Maintaining the balance between neural excitation and inhibition is essential for proper brain function.
  • Dysregulation of this balance is implicated in various neurological disorders.

Purpose of the Study:

  • To investigate the speed and efficacy of inhibitory mechanisms in clamping down novel excitatory bursts in the neocortex.
  • To understand the role of inhibition in maintaining neural homeostasis.

Main Methods:

  • Utilized optogenetics to precisely control neuronal activity.
  • Recorded neural activity in the neocortex to observe the effects of induced excitation and inhibition.

Main Results:

  • Demonstrated that inhibition rapidly and effectively suppresses novel excitatory activity in the neocortex.
  • Quantified the temporal dynamics of inhibitory control over excitation.

Conclusions:

  • The findings highlight the critical role of swift inhibitory processes in preventing runaway excitation.
  • This study provides insights into the neural mechanisms underlying brain stability and offers potential targets for therapeutic interventions.