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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

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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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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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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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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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Implicit memories, also known as non-declarative memories, are long-term memories that function outside of conscious awareness. These memories influence behavior and skills without explicit knowledge. This type of memory is evident in tasks like playing tennis, snowboarding, and texting. Implicit memory has three subsystems: procedural memory, conditioning, and priming. This type of memory is essential in various activities, from everyday tasks to specialized skills.
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Primary motor cortex contributes to the implementation of implicit value-based rules during motor decisions.

Gerard Derosiere1, Alexandre Zénon1, Andrea Alamia1

  • 1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium.

Neuroimage
|October 16, 2016
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Summary

Continuous theta burst stimulation (cTBS) impacts the primary motor cortex (M1) in value-based decision-making. Inhibiting left M1 hindered implicit rule use, while stimulating right M1 enhanced it, showing M1

Keywords:
Action selectionAction valueDecision-makingRewardcTBS

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • The primary motor cortex (M1) is crucial for motor control.
  • Its role in value-based decision-making, particularly with newly acquired implicit rules, requires further investigation.

Purpose of the Study:

  • To investigate the functional contribution of the human primary motor cortex (M1) to motor decisions.
  • To examine how modulating M1 activity affects the implementation of explicit and implicit value-based rules.

Main Methods:

  • Continuous theta burst stimulation (cTBS) was used to modulate M1 activity.
  • Participants performed a decision-making task involving right-hand finger movements with explicit and implicit value-based rules.
  • cTBS was applied to the left M1, right M1, or right somatosensory cortex (control).

Main Results:

  • cTBS over the left M1 impaired the implementation of implicit value-based rules.
  • cTBS over the right M1 enhanced the implementation of implicit value-based rules.
  • The effects were opposite for contralateral versus ipsilateral M1 stimulation.
  • Explicit value-based rule use was unaffected by cTBS.

Conclusions:

  • M1 plays a functional role in implementing newly acquired implicit rules.
  • M1 may be involved in cortico-subcortical networks governing value-based motor decisions.
  • The findings highlight the differential influence of M1 on motor decision-making based on stimulation laterality.