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Energy balance and hypothalamic self-stimulation

D M Atrens, M P Williams, C J Brady

    Behavioural Brain Research
    |June 1, 1982
    PubMed
    Summary
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    Negative energy balance, specifically 48-hour food deprivation, enhances brain reward function and self-stimulation rates. This suggests that energy balance influences brain reward pathways and that self-stimulation impacts energy expenditure.

    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Energy Balance Research

    Background:

    • The relationship between negative energy balance and self-stimulation is poorly understood due to limitations in current experimental methods.
    • Previous studies using continuous reinforcement have yielded conflicting results regarding the effects of food deprivation on self-stimulation.

    Purpose of the Study:

    • To investigate the effects of negative energy balance on brain self-stimulation using a novel fixed-interval reinforcement shuttle-box procedure.
    • To differentiate between reward and escape components of self-stimulation, minimizing performance-altering confounds.

    Main Methods:

    • A fixed-interval reinforcement shuttle-box procedure was employed to measure self-stimulation initiation and escape rates in rats.
    • Rats were subjected to different durations of food deprivation (24 hours and 48 hours) to induce negative energy balance.

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    Main Results:

    • 24 hours of food deprivation did not alter self-stimulation initiation or escape rates.
    • 48 hours of food deprivation selectively increased self-stimulation initiation rates, indicating enhanced reward.
    • This enhancement of reward was observed across the lateral hypothalamus and was independent of stimulus-bound behaviors.

    Conclusions:

    • Negative energy balance selectively increases the excitability of reward-related neurons in the lateral hypothalamus.
    • Self-stimulation in a negative energy balance state leads to hyperphagia but not significant weight gain, suggesting increased energy expenditure.
    • Bidirectional interactions exist between energy balance and self-stimulation behavior.