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Related Experiment Videos

Individual differences in non-regulatory ingestive behavior and catecholamine systems.

G Mittleman, E S Valenstein

    Brain Research
    |November 25, 1985
    PubMed
    Summary

    Animals sensitive to hypothalamic stimulation readily engage in schedule-induced polydipsia (SIP) and respond strongly to amphetamine (AMPH). Early activating experiences, like SIP or AMPH exposure, permanently alter behavior, influencing future responses.

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    Area of Science:

    • Neuroscience
    • Behavioral Science
    • Psychopharmacology

    Background:

    • Electrical stimulation of the lateral hypothalamus (ESLH) elicits feeding and drinking behaviors.
    • Individual differences exist in responsiveness to ESLH, categorizing animals as ESLH-positive (ESLH-pos) or ESLH-negative (ESLH-neg).
    • Previous research suggests varying sensitivities to behavioral activation.

    Purpose of the Study:

    • To investigate the relationship between ESLH responsiveness and sensitivity to behavioral activation via schedule-induced polydipsia (SIP) and amphetamine (AMPH).
    • To determine if early exposure to activating experiences can modify innate ESLH responsiveness.
    • To examine the long-term effects of AMPH on water consumption during SIP tests.

    Main Methods:

    • Categorizing animals into ESLH-pos and ESLH-neg groups based on feeding/drinking responses to lateral hypothalamus electrical stimulation.

    Related Experiment Videos

  • Administering schedule-induced polydipsia (SIP) tests and amphetamine (AMPH) injections to assess behavioral responses.
  • Evaluating the long-term impact of prior SIP or AMPH exposure on ESLH responsiveness and SIP water intake.

    • Main Results:

    • ESLH-pos animals exhibited greater responsiveness to both SIP tests and AMPH injections compared to ESLH-neg animals.
    • Prior exposure to SIP or AMPH permanently converted ESLH-neg animals to exhibit ESLH-elicited feeding/drinking.
    • AMPH pretreatment increased water consumption during subsequent SIP tests.

    Conclusions:

    • Initial differences in sensitivity to activating experiences significantly influence an animal's behavioral propensities.
    • Behavioral activation paradigms, such as SIP and AMPH exposure, can induce lasting changes in neural sensitivity and behavior.
    • These findings highlight the plasticity of neural circuits involved in motivated behaviors and the impact of early life experiences.