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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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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Direct Motor Pathways01:11

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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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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
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Naturalistic Observations02:30

Naturalistic Observations

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If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...
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Modulating Observation-Execution-Related Motor Cortex Activity by Cathodal Transcranial Direct Current Stimulation.

Fengxue Qi1,2,3, Michael A Nitsche4,5, Volker R Zschorlich6,7,8

  • 1Department of Movement Science, Faculty of Philosophy, University of Rostock, 18057 Rostock, Germany. fengxue.qi@hotmail.com.

Brain Sciences
|May 28, 2019
PubMed
Summary

Cathodal transcranial direct current stimulation (ctDCS) applied to the primary motor cortex (M1) during observed movements reduced motor cortex excitability. This neurostimulation technique modulated subsequent motor activity, suggesting potential for treating conditions with heightened cortical excitability.

Keywords:
motor cortex activitymovement executionmovement observationtranscranial direct current stimulation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation

Background:

  • Cortical excitability plays a crucial role in motor control and learning.
  • Understanding non-invasive brain stimulation effects during motor tasks is vital for therapeutic applications.
  • Movement observation can prime motor circuits, but its interaction with neurostimulation requires further investigation.

Purpose of the Study:

  • To investigate the impact of cathodal transcranial direct current stimulation (ctDCS) on primary motor cortex (M1) excitability.
  • To determine if M1 ctDCS during observed movements influences subsequent motor execution.
  • To explore the potential of ctDCS for modulating motor cortex activity in clinical settings.

Main Methods:

  • A randomized sham-controlled study involving 30 healthy participants.
  • Application of 1 mA ctDCS or sham stimulation over the left M1 for 10 minutes during observation of a button-pressing task.
  • Recording of motor-evoked potentials (MEP) from the first dorsal interosseous muscle before, during, and after stimulation and task observation/execution.

Main Results:

  • ctDCS significantly reduced MEP amplitudes during movement observation compared to sham.
  • ctDCS also significantly reduced MEP amplitudes after subsequent movement execution compared to sham.
  • A significant main effect of group and a significant time-by-group interaction were observed.

Conclusions:

  • ctDCS applied to M1 during movement observation effectively modulates motor cortex excitability.
  • This modulation extends to influence execution-related motor cortex activity.
  • The findings suggest potential applications for ctDCS in rehabilitating neurological conditions characterized by excessive cortical activity.