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Spontaneous recovery from overexpectation in an insect

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Title: Spontaneous recovery from overexpectation in an insect
Authors: Terao, Kanta Browse this author
Matsumoto, Yukihisa Browse this author →KAKEN DB
Álvarez, Beatriz Browse this author
Mizunami, Makoto Browse this author →KAKEN DB
Issue Date: 14-Jun-2022
Publisher: Nature Portfolio
Journal Title: Scientific reports
Volume: 12
Issue: 1
Start Page: 9827
Publisher DOI: 10.1038/s41598-022-13800-2
Abstract: In associative learning in mammals, it is widely accepted that learning is determined by the prediction error, i.e., the error between the actual reward and the reward predicted by the animal. However, it is unclear whether error-based learning theories are applicable to the learning occurring in other non-mammalian species. Here, we examined whether overexpectation, a phenomenon that supports error-based learning theories, occurs in crickets. Crickets were independently trained with two different conditioned stimuli (CSs), an odour and a visual pattern, that were followed by an appetitive unconditioned stimulus (US). Then the two CSs were presented simultaneously as a compound, followed by the same US. This treatment resulted in a reduced conditioned response to the odour CS when tested immediately after training. However, the response to the CS was partially recovered after 1 day. These results are the first to show overexpectation and its spontaneous recovery in an invertebrate species. While the results showing overexpectation are in agreement with the prediction by the Rescorla-Wagner model, a major form of error-based learning theories, the ones showing spontaneous recovery are not. Our results suggest that conventional error-based learning models account for some, but not for all essential features of Pavlovian conditioning in crickets.
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)

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