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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.
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...
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...
Motor Units00:46

Motor Units

A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
Motor Units01:13

Motor Units

The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Related Experiment Video

Updated: Jun 23, 2026

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
10:39

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task

Published on: May 3, 2018

Inter-manual transfer and practice: coding of simple motor sequences.

Stefan Panzer1, Melanie Krueger, Thomas Muehlbauer

  • 1Department of Human Movement Science, University of Leipzig, 04109 Leipzig 59, Germany.

Acta Psychologica
|April 25, 2009
PubMed
Summary

This study shows that using the same motor commands (like joint angles) during practice significantly improves learning and memory for movements. This is true even for rapid movements, challenging previous ideas.

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Area of Science:

  • Motor Control
  • Motor Learning
  • Human Movement Science

Background:

  • Movement representation evolves from effector-independent visual-spatial codes to effector-dependent motor codes during practice.
  • The relative timing of these representational shifts may depend on movement characteristics.

Purpose of the Study:

  • To investigate the role of effector-specific motor coordinates versus effector-independent visual-spatial coordinates in motor learning.
  • To examine how inter-manual transfer and practice paradigms influence movement representation and retention.
  • To determine if rapid movement sequences can be effectively encoded using motor coordinates early in practice.

Main Methods:

  • Two experiments involving reproducing 1.3-second elbow flexion-extension patterns were conducted.
  • Experiment 1 utilized an inter-manual transfer paradigm.
  • Experiment 2 employed an inter-manual practice paradigm, comparing transfer and practice conditions using identical motor or visual-spatial coordinates.

Main Results:

  • A significant advantage in effector transfer was observed when motor coordinates from the acquisition phase were reinstated.
  • Inter-manual practice using the same motor coordinates led to superior retention compared to practice or transfer using the same visual-spatial coordinates.
  • The effectiveness of motor versus visual-spatial coding was found to be contingent on movement sequence characteristics (e.g., difficulty, number of elements, control mode).

Conclusions:

  • Motor coordinates play a crucial role in motor learning and retention, particularly when reinstated or consistently practiced.
  • For rapid movement sequences, effective motor encoding can emerge early in practice, contrary to findings with more complex movements.
  • The optimal movement code (motor or visual-spatial) is adaptable and depends on the specific demands of the movement task.