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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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The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
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The nervous system is responsible for coordinating and regulating the body's functions. It functions through three main processes: sensory, integrative, and motor processes. Sensory function involves the detection and transmission of information about internal and external stimuli from sensory receptors to the CNS. The CNS processes this information through an integrative function, where it interprets and makes decisions based on the incoming sensory information. Finally, the motor function...
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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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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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Corticospinal Excitability Modulation During Action Observation
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Cue to action processing in motor cortex populations.

Naveen G Rao1, John P Donoghue

  • 1Department of Neuroscience, Brown University, Providence, Rhode Island.

Journal of Neurophysiology
|November 1, 2013
PubMed
Summary
This summary is machine-generated.

The primary motor cortex (MI) is involved in processing target cues for immediate actions, not just generating movement. Early MI activity reflects cue information, supporting its role in cue-to-action processing.

Keywords:
action goalsmotor cortexpursuit trackingvisiomotor transformation

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • The primary motor cortex (MI) is traditionally viewed as solely responsible for executing motor commands.
  • Emerging evidence suggests MI's involvement in earlier cognitive processes, including cue-to-action transformations.
  • Understanding MI's role in rapid environmental responses is crucial for comprehending motor control.

Purpose of the Study:

  • To investigate the role of the primary motor cortex (MI) in processing sensory cues for immediate action generation.
  • To determine if MI neuronal activity reflects cue information before or during movement execution.
  • To explore MI's contribution to cue-to-action networks.

Main Methods:

  • Utilized multielectrode array recordings in awake, behaving rhesus macaques (Macaca mulatta).
  • Recorded neuronal activity during goal-directed reaching tasks with varying cue-action timing.
  • Employed population decoding techniques to analyze temporal coding of cue information and movement parameters.
  • Investigated MI responses to the extinguishing of a visual target to assess visual processing roles.

Main Results:

  • Early MI ensemble activity was significantly driven by target information when cues were temporally linked to actions.
  • Single-neuron activity spanned cue presentation to movement, with initial responses aligned to cues and later responses to arm movements.
  • Population decoding demonstrated a temporal evolution in MI's coding of cue direction, transitioning from cue processing to action generation.
  • MI activity changes were observed in response to visual target extinguishing, confirming a role in visual target processing.

Conclusions:

  • The primary motor cortex (MI) is integral to a cue-to-action network, particularly for immediate responses to environmental stimuli.
  • MI participates in processing sensory cue information, not solely in motor output generation.
  • Neuronal subpopulations within MI perform computations related to cue-to-action processing, supporting rapid environmental interaction.