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Related Concept Videos

Somatic Spinal Reflexes01:22

Somatic Spinal Reflexes

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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...
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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.
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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 spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
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Spinal Cord01:26

Spinal Cord

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The spinal cord, a critical component of the central nervous system, extends from the base of the brainstem to the lumbar region of the vertebral column. It is essential for maintaining physical stability and facilitating communication between the brain and peripheral parts of the body.
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Updated: Jul 16, 2025

Using a Split-belt Treadmill to Evaluate Generalization of Human Locomotor Adaptation
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Dynamic spinal reflex adaptation during locomotor adaptation.

Omar Refy1,2,3, Belle Blanchard4, Abigail Miller-Peterson4,5

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States.

Journal of Neurophysiology
|September 13, 2023
PubMed
Summary
This summary is machine-generated.

Spinal reflex gains change during split-belt walking adaptation, showing rapid, unilateral modulation that corrects leg asymmetry. This modulation, likely from supraspinal centers, is key to adapting gait.

Keywords:
H-reflexhuman gaitlocomotionlocomotor adaptationspinal reflex

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Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Locomotor adaptation involves complex spinal and supraspinal interactions.
  • The precise role of spinal reflexes in adapting gait to asymmetric conditions is not fully understood.

Purpose of the Study:

  • To investigate changes in spinal reflex gains during split-belt locomotor adaptation.
  • To explore the relationship between spinal reflex modulation and gait asymmetry correction.

Main Methods:

  • Utilized Hoffmann reflex measurements to assess spinal reflex gains.
  • Analyzed reflex modulation patterns during initial and repeated split-belt walking exposures.
  • Correlated reflex gain modulation with measures of leg asymmetry.

Main Results:

  • Demonstrated dynamic modulation of spinal reflex gains during split-belt adaptation.
  • Observed rapid, unilateral reflex suppression or facilitation ipsilateral to speed change, followed by slow recovery.
  • Showed that reflex modulation strongly correlates with leg asymmetry correction and is not solely due to speed changes.

Conclusions:

  • Spinal reflex modulation is an integral component of split-belt locomotor adaptation.
  • Reflex modulation is likely of supraspinal origin and can be unilaterally controlled.
  • Suggests reflex modulation as a potential mechanism for adapting gait asymmetry in healthy individuals.