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Reduction of contextual control of conditioned responses by extended Pavlovian training in an insect

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Title: Reduction of contextual control of conditioned responses by extended Pavlovian training in an insect
Authors: Sato, Misato Browse this author
Alvarez, Beatriz Browse this author
Mizunami, Makoto Browse this author →KAKEN DB
Issue Date: Jan-2021
Publisher: Cold Spring Harbor Laboratory Press
Journal Title: Learning & memory
Volume: 28
Issue: 1
Start Page: 17
End Page: 24
Publisher DOI: 10.1101/lm.052100.120
Abstract: The effect of repetitive training on learned behavior has been an important subject in neuroscience. In instrumental conditioning in mammals, learned action early in training is often goal-driven and controlled by outcome expectancy, but as training progresses, it becomes more habitual and insensitive to outcome devaluation. Similarly, we recently showed in Pavlovian conditioning in crickets (Gryllus bimaculatus) that a conditioned response (CR) is initially sensitive to devaluation of the unconditioned stimulus but becomes insensitive to it after extended training. It is known that habitual responses after extended instrumental training are characterized by a higher context specificity than are initial goal-directed actions in mammals. In this study, we investigated whether this is applicable to Pavlovian conditioning in crickets. In crickets that received a standard amount of training to associate an odor with water reward under illumination, CR under illumination was stronger than that in the dark. In crickets that received extended training under illumination, on the other hand, the level of CR did not differ in different light conditions. Further experiments confirmed that context specificity decreases with the development of behavioral automaticity by extended training, as opposed to findings in instrumental training in mammals. We conclude that the nature of habitual behaviors after extended training differs in different learning systems of animals.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 水波 誠

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