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Related Concept Videos

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Related Experiment Video

Updated: Jan 7, 2026

Visualization Method for Proprioceptive Drift on a 2D Plane Using Support Vector Machine
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Priors and proprioceptive predictions.

Thomas Parr1, Maxwell Jd Ramstead2, Karl Friston2

  • 1Nuffield Department of Clinical Neurosciences, University of Oxford, UK.

Current Opinion in Behavioral Sciences
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Summary
This summary is machine-generated.

Motor commands are proprioceptive predictions, enabling movement execution via reflex arcs that correct deviations. This active inference approach integrates prior beliefs and confidence for motor control.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • The Equilibrium Point Hypothesis offers a framework for understanding motor control.
  • Existing models often focus on efference copy rather than predictive processing.

Purpose of the Study:

  • To present an active inference approach to motor control based on proprioceptive predictions.
  • To explore how the brain generates these predictions and implements motor commands.

Main Methods:

  • Review of the Equilibrium Point Hypothesis and active inference principles.
  • Analysis of control-theoretic perspectives on reflexes as feedback loops.
  • Examination of neurobiological substrates for predictive computations.

Main Results:

  • Motor commands are conceptualized as proprioceptive predictions.
  • Reflexes function as closed feedback loops regulated by predicted sensory consequences.
  • Key elements generating predictions include prior beliefs, temporal structure, and predictive confidence.

Conclusions:

  • The corticospinal, cerebellar, and extrapyramidal systems are implicated in generating and utilizing proprioceptive predictions for motor control.
  • This framework offers a unified view of motor planning and execution through predictive processing.