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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.
Action Potential01:14

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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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Direct Motor Pathways01:11

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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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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.
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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.
Propagation of Action Potentials01:23

Propagation of Action Potentials

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Related Experiment Video

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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

Deriving motor primitives through action segmentation.

Paul E Hemeren1, Serge Thill

  • 1School of Humanities and Informatics, University of Skövde Skövde, Sweden.

Frontiers in Psychology
|August 12, 2011
PubMed
Summary
This summary is machine-generated.

Movement perception relies on both top-down and bottom-up processing. This study shows that kinematic details, not just high-level context, drive action segmentation, revealing insights into motor primitives.

Keywords:
action recognitionaction representationbiological motionevent segmentationmirror neuronsmotor cognitionmotor primitivespoint-light displays

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Perception

Background:

  • The mirror system is hypothesized to use motor primitives for action understanding.
  • Action segmentation is crucial for parsing complex movements.

Purpose of the Study:

  • To investigate the influence of processing levels (top-down vs. bottom-up) on movement kinematics perception.
  • To determine if action segmentation relies more on kinematics or high-level contextual information.
  • To gain insights into potential motor primitives utilized by the mirror system.

Main Methods:

  • Participants performed an action segmentation task on point-light displays of hand/arm grasping actions.
  • Actions were presented in canonical orientation with object context (top-down) or inverted without object context (bottom-up).
  • Segmentation behavior was analyzed in relation to kinematic variables (direction, velocity, acceleration).

Main Results:

  • Participants reliably segmented actions based on low-level kinematics even with impaired high-level recognition (inverted condition).
  • Segmentation in both top-down and bottom-up conditions correlated significantly with wrist kinematic variables.
  • Both processing levels yielded similar segmentation behavior in an unconstrained task.

Conclusions:

  • Motor primitives can be reliably identified through visual segmentation based on movement kinematics.
  • Both top-down and bottom-up processing contribute to action segmentation.
  • Kinematic information plays a significant role in perceiving and segmenting grasping actions.