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Related Concept Videos

Hierarchy of Motor Control01:18

Hierarchy of Motor Control

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.
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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.
Indirect Motor Pathways01:22

Indirect Motor Pathways

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.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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 posterior columns...
Direct Motor Pathways01:11

Direct Motor Pathways

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.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...

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Related Experiment Video

Updated: Jun 5, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Spatial constancy mechanisms in motor control.

W Pieter Medendorp1

  • 1Radboud University Nijmegen, Donders Institute for Brain, Cognition and Behaviour, PO Box 9104, NL-6500 HE Nijmegen, The Netherlands. p.medendorp@donders.ru.nl

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|January 19, 2011
PubMed
Summary
This summary is machine-generated.

The brain maintains spatial constancy by dynamically updating its representation of 3D action space. This involves integrating sensory and motor signals, crucial for goal-directed movements despite constant body and eye motion.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Human interaction with the environment relies on spatial stability.
  • Continuous sensory and motor changes necessitate sophisticated brain mechanisms.

Purpose of the Study:

  • To review recent advances in understanding how the brain maintains spatial constancy.
  • To explore the neural mechanisms underlying spatial stability during movement.

Main Methods:

  • Review of studies on saccadic system, eye-head gaze shifts, smooth pursuit, and vergence.
  • Analysis of geometric complexities in spatial constancy across head and body movements.
  • Discussion of behavioral mechanisms for arm motor control.

Main Results:

  • Spatial constancy is governed by dynamic feed-forward processes and gaze-centered remapping.
  • Both feed-forward and sensory feedback are crucial for spatial updating.
  • The brain computes an evolving 3D action space representation.

Conclusions:

  • The brain integrates noisy sensory and motor signals non-linearly for spatial constancy.
  • Understanding these mechanisms has physiological implications for brain function.
  • This research highlights the brain's adaptive strategies for spatial stability.