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Related Concept Videos

Somatic Spinal Reflexes01:22

Somatic Spinal Reflexes

Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
Reflex Activity01:08

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...
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 15, 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

Changes in spinal reflex excitability associated with motor sequence learning.

Ovidiu Lungu1, Alain Frigon, Mathieu Piché

  • 1Unité de Neuroimagerie Fonctionelle, Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, Montréal, Quebec, Canada. o.lungu@umontreal.ca

Journal of Neurophysiology
|March 19, 2010
PubMed
Summary
This summary is machine-generated.

Motor sequence learning alters spinal cord activity. This study shows reduced H-reflex amplitude during implicit sequence learning, indicating changes in spinal reflex circuits.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Physiology

Background:

  • Motor sequence learning involves brain changes, but spinal cord involvement is unclear.
  • Previous studies suggest altered spinal reflex activity during motor skill acquisition.
  • A direct link between motor sequence learning and spinal excitability changes has not been established.

Purpose of the Study:

  • To investigate if motor sequence learning induces detectable changes at the spinal cord level.
  • To examine the modulation of H-reflex amplitude during implicit motor sequence learning.

Main Methods:

  • 14 healthy individuals performed motor tasks under three conditions: sequence, random, and simple movements.
  • H-reflex amplitude was measured in the flexor carpi radialis muscle.
  • Background muscular activity was controlled to isolate reflex changes.

Main Results:

  • H-reflex amplitude was significantly reduced in the sequence condition compared to random and simple conditions (43.8% vs. 38.2% and 31.5%).
  • No significant differences in M-response were observed across conditions.
  • H-reflex changes occurred early in learning, persisted until asymptotic performance, and lasted over 60 seconds post-task.

Conclusions:

  • Implicit motor sequence learning alters spinal reflex circuit excitability.
  • These findings demonstrate a spinal cord contribution to motor sequence learning.
  • Spinal changes reflect the ongoing learning process and show lasting effects.