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Learned contextual cue potentiates eating in rats.

Gorica D Petrovich1, Cali A Ross, Michela Gallagher

  • 1Department of Psychological and Brain Sciences, Johns Hopkins University, 3400 North Charles St., Baltimore, MD 21218, United States. petrovich@jhu.edu

Physiology & Behavior
|November 3, 2006
PubMed
Summary

Environmental cues associated with eating can increase food intake even when not hungry. This study shows context conditioned stimuli (CSs) specifically increase consumption of trained food, not general food, suggesting a craving-like state rather than hunger.

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Area of Science:

  • Behavioral neuroscience
  • Animal models of eating behavior
  • Conditioned learning

Background:

  • Environmental cues play a significant role in regulating food intake.
  • Conditioned stimuli (CSs) paired with food can influence eating behavior, particularly under conditions of hunger.
  • The impact of contextual conditioned stimuli on eating behavior during satiety is less understood.

Purpose of the Study:

  • To investigate whether contextual conditioned stimuli (CSs) associated with food consumption during deprivation can enhance food intake in non-deprived rats.
  • To determine if this effect is specific to the conditioned food or generalizes to other food types.
  • To explore the motivational state underlying CS-potentiated eating.

Main Methods:

  • Rats were trained to associate a specific context with eating food pellets while food-deprived.

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  • Following conditioning, rats' food consumption was assessed in the conditioning context under conditions of satiety.
  • Consumption of the training food pellets was compared to consumption of familiar lab chow.

    • Main Results:

    • Rats consumed significantly more of the training food pellets when presented in the conditioning context under satiety compared to control conditions.
    • The conditioning context did not alter the consumption of familiar lab chow.
    • This indicates a specific potentiation of eating for the conditioned food.

    Conclusions:

    • Contextual conditioned stimuli (CSs) can effectively potentiate eating behavior for specific foods, even in a state of satiety.
    • CS-potentiation of eating appears to be a specific motivational state, akin to craving, rather than a general increase in hunger.
    • These findings contribute to understanding the complex interplay between environmental cues, learning, and eating behavior regulation.