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Plasma catecholamines associated with hypothalamically-elicited flight behavior.

S L Stoddard, V K Bergdall, D W Townsend

    Physiology & Behavior
    |January 1, 1986
    PubMed
    Summary
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    Stimulating specific brain regions in cats triggered escape behavior and activated the sympatho-adrenal system. This involved increased adrenal hormones and changes in heart rate and blood pressure, suggesting overlapping neural pathways for flight and physiological responses.

    Area of Science:

    • Neuroscience
    • Physiology
    • Behavioral Science

    Background:

    • The hypothalamus plays a crucial role in regulating complex behaviors and physiological responses.
    • Understanding the neural underpinnings of escape behavior and its associated autonomic activation is vital.

    Purpose of the Study:

    • To identify hypothalamic sites that elicit flight (escape) behavior in cats.
    • To investigate the relationship between hypothalamic stimulation, sympatho-adrenal (SA) activation, and cardiovascular (CV) responses.
    • To compare SA activation during escape behavior with that during affective defense.

    Main Methods:

    • Stimulation of 29 hypothalamic sites in 18 anesthetized cats.
    • Measurement of norepinephrine (NE) and epinephrine (E) in adrenal and peripheral venous plasma to assess SA activation.

    Related Experiment Videos

  • Continuous monitoring of heart rate (HR) and mean arterial pressure (MAP) for CV activation assessment.

    • Main Results:

    • Hypothalamic stimulation frequently elicited an increase in adrenal medullary output of NE and E (≥10 ng/min).
    • Increased MAP was significantly correlated with bilateral increases in adrenal catecholamines (CAs).
    • Increased HR was significantly correlated with increased peripheral venous NE.

    Conclusions:

    • Hypothalamic regions triggering flight behavior overlap with those activating the adrenal medullary and cardiovascular systems.
    • The study provides insights into the neural control of escape responses and associated autonomic and hormonal changes.
    • Findings contribute to understanding the neural basis of different emotional and behavioral states.