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Neural network interactions and ingestive behavior control during anorexia.

Alan G Watts1, Dawna S Salter, Christina M Neuner

  • 1The Neuroscience Research Institute and Neuroscience Graduate Program, USC College, University of Southern California, Los Angeles, CA 90089-2520, United States. watts@usc.edu

Physiology & Behavior
|May 29, 2007
PubMed
Summary
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Dehydration-induced anorexia is controlled by osmosensitive pathways directly activating hypothalamic neurons (PVH and LHA), not by altering sensory inputs. This model explains how the brain regulates feeding behavior under physiological stress.

Area of Science:

  • Neuroscience
  • Physiology
  • Behavioral Biology

Background:

  • Motivated feeding behavior is complex, involving numerous regulatory models.
  • Eliot Stellar's concept highlights hypothalamic control networks integrating sensory inputs.
  • Anorexia results from an imbalance favoring feeding restraint.

Purpose of the Study:

  • To present experimental evidence for a specific model of motivated feeding control.
  • To elucidate the neural pathways involved in anorexia due to dehydration.
  • To investigate the role of hypothalamic neurons in regulating ingestive behavior.

Main Methods:

  • Review of experimental evidence supporting a hypothalamic control model.
  • Analysis of pathways activated by increased plasma osmolality from hypertonic saline intake.

Related Experiment Videos

  • Examination of afferent inputs to hypothalamic neurons (PVH and LHA).

    • Main Results:

    • Increased plasma osmolality activates pathways projecting to paraventricular nucleus (PVH) and lateral hypothalamic area (LHA) neurons.
    • These hypothalamic neurons act as the central controller for ingestive behavior.
    • Osmosensitive projections to PVH and LHA neurons, rather than afferent inputs, generate anorexia in dehydrated animals.

    Conclusions:

    • The model posits that osmosensitive hypothalamic neurons directly control feeding behavior.
    • Anorexia in dehydration is mediated by direct activation of PVH and LHA neurons.
    • This provides a refined understanding of the neural basis of motivated feeding and anorexia.