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Related Concept Videos

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.
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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the cerebellum's...
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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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Motor Imagery Performance Through Embodied Digital Twins in a Virtual Reality-Enabled Brain-Computer Interface Environment
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Published on: May 10, 2024

Bilateral parietal cortex function during motor imagery.

Melanie K Fleming1, Cathy M Stinear, Winston D Byblow

  • 1Movement Neuroscience Laboratory, Department of Sport and Exercise Science, University of Auckland, Auckland, New Zealand.

Experimental Brain Research
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

This study shows the superior parietal lobule (SPL) is crucial for motor imagery (MI). Disrupting the SPL with transcranial magnetic stimulation (TMS) impaired imagined movement accuracy, suggesting its role in motor planning and rehabilitation.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • Motor imagery (MI) involves mentally simulating movements without physical execution.
  • The parietal cortex, particularly the superior parietal lobule (SPL), is hypothesized to play a role in MI.
  • Understanding the neural basis of MI is crucial for applications in motor learning and rehabilitation.

Purpose of the Study:

  • To investigate the specific involvement of the parietal cortex, especially the SPL, during motor imagery.
  • To determine the causal role of the SPL in the accuracy and confidence of motor imagery.

Main Methods:

  • Experiment 1: Functional magnetic resonance imaging (fMRI) to identify brain regions activated during upper limb motor imagery.
  • Experiment 2: Single-pulse transcranial magnetic stimulation (TMS) applied to the left or right SPL during motor imagery to assess its causal role.
  • Behavioral measures included accuracy and confidence ratings of the imagined movements.

Main Results:

  • fMRI revealed activation in the inferior and superior parietal cortex bilaterally during MI.
  • TMS over the SPL significantly degraded the accuracy of motor imagery compared to sham stimulation.
  • Both accuracy and confidence in MI decreased with stimulation later in the movement sequence, regardless of hemisphere.

Conclusions:

  • The superior parietal lobule (SPL) plays a critical and causal role in motor imagery.
  • These findings support the involvement of the SPL in the neural network underlying motor planning and simulation.
  • The results have potential implications for developing novel rehabilitation strategies for individuals with brain injuries affecting motor function.