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Context-dependent olfactory learning monitored by activities of salivary neurons in cockroaches

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Title: Context-dependent olfactory learning monitored by activities of salivary neurons in cockroaches
Authors: Sato Matsumoto, Chihiro Browse this author
Matsumoto, Yukihisa Browse this author
Watanabe, Hidehiro Browse this author
Nishino, Hiroshi Browse this author
Mizunami, Makoto Browse this author →KAKEN DB
Keywords: Context-dependent learning
Nonelemental learning
Issue Date: Jan-2012
Publisher: Elsevier
Journal Title: Neurobiology of Learning and Memory
Volume: 97
Issue: 1
Start Page: 30
End Page: 36
Publisher DOI: 10.1016/j.nlm.2011.08.010
Abstract: Context-dependent discrimination learning, a sophisticated form of nonelemental associative learning, has been found in many animals, including insects. The major purpose of this research is to establish a method for monitoring this form of nonelemental learning in rigidly restrained insects for investigation of underlying neural mechanisms. We report context-dependent olfactory learning (occasion-setting problem solving) of salivation, which can be monitored as activity changes of salivary neurons in immobilized cockroaches, Periplaneta americana. A group of cockroaches was trained to associate peppermint odor (conditioned stimulus, CS) with sucrose solution reward (unconditioned stimulus, US) while vanilla odor was presented alone without pairing with the US under a flickering light condition (1.0 Hz) and also trained to associate vanilla odor with sucrose reward while peppermint odor was presented alone under a steady light condition. After training, the responses of salivary neurons to the rewarded peppermint odor were significantly greater than those to the unrewarded vanilla odor under steady illumination and those to the rewarded vanilla odor was significantly greater than those to the unrewarded peppermint odor in the presence of flickering light. Similar context-dependent responses were observed in another group of cockroaches trained with the opposite stimulus arrangement. This study demonstrates context-dependent olfactory learning of salivation for the first time in any vertebrate and invertebrate species, which can be monitored by activity changes of salivary neurons in restrained cockroaches.
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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