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Induced immobility in nervous and normal Pointer dogs

W G Reese, J E Newton, C Angel

    The Journal of Nervous and Mental Disease
    |October 1, 1982
    PubMed
    Summary
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    Nervous Pointer dogs exhibit exaggerated motion inhibition, readily entering tonic immobility (TI) when inverted. This response, unlike in normal dogs, was linked to decreased heart rate, offering a motor sign for behavioral studies.

    Area of Science:

    • Behavioral Biology
    • Neuroscience
    • Animal Behavior

    Background:

    • Pointer dogs display complex hunting behaviors, including immobility ('on point').
    • Nervous Pointer lines show reduced activity and freezing responses in human presence.
    • This exaggerated motion inhibition trait is a focus for behavioral research.

    Purpose of the Study:

    • To identify an objective motor sign correlating with biochemical and pharmacological events.
    • To systematically demonstrate and characterize tonic immobility (TI) in mature dogs.
    • To compare the responses of nervous and normal Pointer dogs to manual inversion.

    Main Methods:

    • Manual inversion into a sling and stroking to induce tonic immobility (TI).
    • Telemetered heart rate (HR) monitoring during inversion and release.

    Related Experiment Videos

  • Observation of motor activity in both nervous and normal Pointer dogs.

    • Main Results:

    • 10 out of 10 nervous dogs developed TI, unlike their normal kennel mates.
    • TI in nervous dogs was accompanied by a reduced heart rate (HR) compared to baseline.
    • Normal dogs showed varied responses, including relaxation or continued activity, with different HR patterns.

    Conclusions:

    • Tonic immobility (TI) is systematically demonstrated in mature nervous Pointer dogs.
    • The exaggerated motion inhibition in nervous dogs is linked to specific physiological responses.
    • Findings offer implications for understanding behavior, psychiatry, and behavioral biology.