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Development of behavioural automaticity by extended Pavlovian training in an insect

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Title: Development of behavioural automaticity by extended Pavlovian training in an insect
Authors: Mizunami, Makoto Browse this author →KAKEN DB
Hirohata, Sho Browse this author
Sato, Ai Browse this author
Arai, Ryoichi Browse this author
Terao, Kanta Browse this author
Sato, Misato Browse this author
Matsumoto, Yukihisa Browse this author
Keywords: habit formation
classical conditioning
reward devaluation
Issue Date: 2-Jan-2019
Publisher: Royal Society
Journal Title: Proceedings of the royal society b-biological sciences
Volume: 286
Issue: 1894
Start Page: 20182132
Publisher DOI: 10.1098/rspb.2018.2132
Abstract: The effect of repetitive training on learned actions has been a major subject in behavioural neuroscience. Many studies of instrumental conditioning in mammals, including humans, suggested that learned actions early in training are goal-driven and controlled by outcome expectancy, but they become more automatic and insensitive to reduction in the value of the outcome after extended training. It was unknown, however, whether the development of value-insensitive behaviour also occurs by extended training of Pavlovian conditioning in any animals. Here we show that crickets Gryllus bimaculatus that had received minimal training to associate an odour with water (unconditioned stimulus, US) did not exhibit conditioned response (CR) to the odour when they were given water until satiation before the test, but those that had received extended training exhibited CR even when they were satiated with water. Further pharmacological experiments suggested that octopamine neurons, the invertebrate counterparts of noradrenaline neurons, mediate US value signals and control execution of CR after minimal training, but the control diminishes with the progress of training and hence the CR becomes insensitive to US devaluation. The results suggest that repetitive sensory experiences can lead to a change from a goal-driven response to a more automatic one in crickets.
Type: article (author version)
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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