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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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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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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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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Somatosensory, Motor, and Association Cortex01:24

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Force and Position Control in Humans - The Role of Augmented Feedback
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Rotational dynamics in motor cortex are consistent with a feedback controller.

Hari Teja Kalidindi1, Kevin P Cross2, Timothy P Lillicrap3

  • 1The BioRobotics Institute, Scuola Superiore Sant'Anna, Pisa, Italy.

Elife
|November 3, 2021
PubMed
Summary
This summary is machine-generated.

Rotational dynamics in the motor cortex may not solely stem from internal connections. Sensory feedback and interactions with other brain regions significantly influence motor control, suggesting broader system-level dynamics.

Keywords:
computational biologyfeedback controlfronto-parietal circuitsmotor cortexneurosciencepopulation dynamicsrecurrent neural networksrhesus macaquesystems biology

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Motor Control

Background:

  • Recent research highlights rotational dynamics in the motor cortex (MC).
  • Existing theories often attribute these dynamics to intrinsic MC connections.
  • Alternative perspectives suggest MC functions as a feedback controller, relying on sensory feedback and inter-areal interactions.

Purpose of the Study:

  • To investigate the origins of rotational dynamics in motor control.
  • To reconcile conflicting theories regarding intrinsic versus feedback-driven dynamics in the motor cortex.
  • To explore the role of sensory feedback in generating observed neural dynamics.

Main Methods:

  • Developed recurrent neural networks (RNNs) to model a limb and its sensory feedback.
  • Trained RNNs to perform motor tasks: counteracting perturbations and reaching for targets.
  • Analyzed neural activity and sensory feedback within the RNNs.
  • Recorded neural activity in monkeys performing similar motor tasks.

Main Results:

  • Rotational structure was observed in RNN activity and sensory feedback, even without recurrent connections.
  • Neural recordings from monkeys showed rotational structure in both motor cortex and somatosensory cortex.
  • These findings challenge the exclusive reliance on intrinsic connections to explain motor cortex dynamics.

Conclusions:

  • Rotational structure in neural activity may reflect broader dynamics within the voluntary motor system.
  • Continuous sensory feedback and inter-areal interactions play a crucial role in online motor control.
  • The study suggests that rotational dynamics are not exclusive to the motor cortex but are present throughout the motor system involved in action control.