Japanese Journal of Animal Psychology
Online ISSN : 1880-9022
Print ISSN : 0916-8419
ISSN-L : 0916-8419
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Volume 55, Issue 1
June
Displaying 1-6 of 6 articles from this issue
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Review
  • Motivational factors involved in food-carrying behavior of rats: a review
    YASUHIRO ONUKI, EIKO NAKATSUYAMA
    2005 Volume 55 Issue 1 Pages 1-9
    Published: 2005
    Released on J-STAGE: April 14, 2006
    DOIhttps://doi.org/10.2502/janip.55.1
    JOURNAL FREE ACCESS
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    The present paper reviews studies on the choice between food-carrying and food-eating behaviors in foraging rats. First, influences of external (e. g., food size and distance to food) and internal factors (e. g., hunger levels and differences between the sexes) on the animals' choice are separately discussed. For example, rats tend to eat the food at the site where they find it if its size is small, but to carry it to their nest if the size is large. Second, several functional aspects of food-carrying behavior are discussed by taking all of the factors into consideration. It is suggested that the choice between food-carrying and food-eating behaviors is mainly based on a trade-off or a motivational conflict between hunger and risk avoidance; that is, carrying food has an advantage of avoiding a predatory risk by shortening the time staying outside the nest, whereas eating at the food site immediately reduces hunger. It is also suggested that individual differences and physiological mechanisms involved in this choice should be studied in the future.
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Short Report
  • Olfactory discrimination of male sexual odor in female rats using habituation-dishabituation paradigm
    SAWA KONDO, TOHRU TANIUCHI, YASUHIKO KONDO
    2005 Volume 55 Issue 1 Pages 11-16
    Published: 2005
    Released on J-STAGE: April 14, 2006
    DOIhttps://doi.org/10.2502/janip.55.11
    JOURNAL FREE ACCESS
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    The present study examined whether a new habituation-dishabituation paradigm using multiple habituation-donors can detect the ability to discriminate sexual activeness of males by female rats. All females were ovariectomized and chronically treated with estradiol benzoate. During the habituation trials, half of the females were exposed to a urine odor obtained from a single castrated male (the single donor group), and the other half were exposed to 4 different urine odors collected from 4 different castrated males (the multiple donor group). After the habituation trials, half of each group was tested with a urine odor of a novel intact male, and the other half with that of a novel castrated male. Females exposed to odor of single males showed a significant increase in investigation time to the test-donor odor, irrespective of donors' sexual activeness. In contrast, females habituated to odors of multiple males showed dishabituation specific to odor of intact test males. These results suggest that the habituation-dishabituation paradigm with multiple donors should be useful for evaluating the discrimination ability of sexual odors by rats.
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Lecture
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