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Related Concept Videos

Regulation of Food Intake01:30

Regulation of Food Intake

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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Progressive-ratio Responding for Palatable High-fat and High-sugar Food in Mice
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Rapid food-aversion learning by a terrestrial mollusk.

A Gelperin

    Science (New York, N.Y.)
    |August 15, 1975
    PubMed
    Summary

    The terrestrial slug Limax maximus learns to avoid palatable food after a single exposure if it is paired with carbon dioxide (CO2) poisoning. This learned avoidance, mediated by olfactory cues, persists for up to three weeks.

    Area of Science:

    • Neuroscience
    • Animal Behavior
    • Olfactory Learning

    Background:

    • The terrestrial slug Limax maximus exhibits a notable capacity for associative learning.
    • Understanding rapid-onset learning mechanisms is crucial for neuroscience.

    Purpose of the Study:

    • To investigate the learning and memory capabilities of Limax maximus.
    • To analyze the neurophysiological basis of rapid, long-duration learning in slugs.

    Main Methods:

    • Pairing palatable food with carbon dioxide (CO2) poisoning in Limax maximus.
    • Observing and recording the slugs' behavioral avoidance responses.
    • Assessing the duration of learned avoidance.

    Main Results:

    • Slugs demonstrated rapid, one-trial learning to avoid the associated food.

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  • Avoidance behavior, primarily through olfactory cues, was observed.
  • The learned avoidance persisted without error for up to three weeks.

    • Conclusions:

    • Limax maximus possesses a robust, rapid-onset learning mechanism for avoiding harmful substances.
    • Olfactory cues play a significant role in this learned avoidance.
    • The slug provides a valuable model for studying the neurophysiology of long-lasting memory.