Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Is the functional stretch response servo controlled or preprogrammed?

C W Chan, R E Kearney

    Electroencephalography and Clinical Neurophysiology
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Olfactory enrichment - effects of odorised straw on exploratory behaviour, straw engagement, and play in finishing pigs.

    Animal : an international journal of animal bioscience·2026
    Same author

    Gastrodia-Uncaria water extract and tissue plasminogen activator for treating embolus-induced cerebral ischaemia: abridged secondary publication.

    Hong Kong medical journal = Xianggang yi xue za zhi·2020
    Same author

    Maintaining breast cancer care in the face of COVID-19.

    The British journal of surgery·2020
    Same author

    Family medicine vocational training and career satisfaction in Hong Kong.

    BMC family practice·2019
    Same author

    Ductal carcinoma in-situ arising within benign phyllodes tumours.

    Annals of the Royal College of Surgeons of England·2018
    Same author

    Spinal cord stimulation for chronic non-cancer pain: a review of current evidence and practice.

    Hong Kong medical journal = Xianggang yi xue za zhi·2017
    Same journal

    Coming to terms with brain waves.

    Electroencephalography and clinical neurophysiology·2014
    Same journal

    Habituation of lower leg stretch responses in Parkinson's disease.

    Electroencephalography and clinical neurophysiology·2000
    Same journal

    Asymmetry of cortical excitability revealed by transcranial stimulation in a patient with focal motor epilepsy and cortical myoclonus.

    Electroencephalography and clinical neurophysiology·2000
    Same journal

    Evoked isometric muscle contractions in myopathies: analysis of pathophysiological properties by different stimulus patterns.

    Electroencephalography and clinical neurophysiology·2000
    Same journal

    Task-related coherence and task-related spectral power changes during sequential finger movements.

    Electroencephalography and clinical neurophysiology·2000
    Same journal

    Electrophysiological studies in mild idiopathic carpal tunnel syndrome.

    Electroencephalography and clinical neurophysiology·2000
    See all related articles

    Late electromyographic (EMG) responses, known as the fast stretch reflex (FSR), appear to be preprogrammed, not servo-controlled. This suggests a triggered release of movement patterns rather than continuous adjustment to limb displacement.

    Area of Science:

    • Neuroscience
    • Human Motor Control
    • Biomechanics

    Background:

    • Long latency electromyographic (EMG) responses to limb displacement may involve transcortical pathways.
    • The control mechanism of these late responses (servo-controlled vs. preprogrammed) remains unclear.

    Purpose of the Study:

    • To investigate whether late EMG responses (FSR) are servo-controlled or preprogrammed.
    • To examine the relationship between FSR characteristics and displacement parameters (amplitude, velocity).

    Main Methods:

    • Mapped late EMG responses (FSR) in ankle muscles of human subjects across varying displacement amplitudes and velocities.
    • Compared FSRs evoked by sustained ramp displacements (500 ms) versus transient pulse displacements (60 ms).

    Main Results:

    Related Experiment Videos

    • A weak correlation was observed between initial FSR components and displacement parameters, with individual variations.
    • No significant differences in latency or rise time of FSRs were found between ramp and pulse displacements.
    • FSR similarity across different input patterns contradicts servo control but supports preprogrammed activity.

    Conclusions:

    • The initial part of the FSR is likely generated by a preprogrammed motor pattern, triggered by limb displacement.
    • This preprogrammed activity runs its course largely independent of specific displacement details, unlike a servo mechanism.