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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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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...
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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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.
Motor Areas
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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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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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Lobes of the Cerebrum01:22

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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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Updated: Jul 11, 2025

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Superior colliculus bidirectionally modulates choice activity in frontal cortex.

Alyse Thomas1, Weiguo Yang1, Catherine Wang1

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA.

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|November 14, 2023
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Summary
This summary is machine-generated.

The superior colliculus (SC) modulates frontal cortex activity during decision-making. This study reveals how SC influences choice competition and action selection in the brain.

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Area of Science:

  • Neuroscience
  • Decision-making
  • Action selection

Background:

  • Action selection involves competition between choices.
  • Neural activity in frontal cortex and superior colliculus (SC) correlates with choice competition.
  • The interaction between these regions in mediating choice competition is not well understood.

Purpose of the Study:

  • To investigate the interaction between the frontal cortex and superior colliculus (SC) in mediating choice competition.
  • To determine if the SC can modulate frontal cortex activity during decision-making.

Main Methods:

  • Utilized a mouse model for directional licking tasks.
  • Recorded neural activity in topographically matched regions of the frontal cortex and SC.
  • Manipulated specific neuronal populations (GABAergic and glutamatergic) in the SC.

Main Results:

  • Identified a descending motor pathway and a re-entrant loop between frontal cortex and SC.
  • Observed distinct neuronal populations in both regions encoding opposing choices and exhibiting competition.
  • Demonstrated that activating or suppressing SC GABAergic and glutamatergic neurons bidirectionally altered frontal cortex activity.

Conclusions:

  • The superior colliculus (SC) plays a critical role in bidirectionally modulating choice competition.
  • SC influences action selection by driving activity in the frontal cortex.
  • Identified the SC as a key node for regulating choice competition within the action selection network.