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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...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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 3, 2026

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes
09:27

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Published on: January 19, 2024

Temporal shift in task factor influence across the stretch reflex.

Frida Torell1,2, Robin Rohlén1,3, Michael Dimitriou1

  • 1Department of Medical and Translational Biology, Umeå University, Umeå, Sweden.

Plos One
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

Mechanical perturbations trigger arm reflexes like the stretch reflex (SLR and LLR). Task factors such as load and target direction influence these responses, especially in shoulder muscles during delayed reaches.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Mechanical perturbations to the arm elicit rapid reflexive actions.
  • The stretch reflex comprises short-latency reflex (SLR) and long-latency reflex (LLR) components.

Purpose of the Study:

  • To investigate how task factors influence SLR and LLR components during a delayed-reach paradigm.
  • To analyze the effects of mechanical load, preparatory delay, perturbation, and target direction on reflex responses.

Main Methods:

  • Utilized multiple linear regression (MLR) analysis.
  • Analyzed electromyographic (EMG) activity from seven right arm muscles.
  • Examined main effects and two-factor interactions of task variables.

Main Results:

  • Shoulder girdle muscles showed task-dependent engagement; biceps and triceps acted as stabilizers.
  • SLR modulation was observed in shoulder muscles, influenced by load and perturbation.
  • Late LLR demonstrated significant task-dependent modulation, shaped by perturbation and target direction interactions.

Conclusions:

  • Reflex responses, particularly LLR, are dynamically modulated by task parameters in a delayed-reach context.
  • Findings highlight the differential control of reflex components based on task demands.
  • Results provide insights into stretch reflex modulation and inform future research designs.