Relationship between learning ability and starvation status in taste aversion learning of a pond snail

Abstract

Event Abstract Back to Event Relationship between learning ability and starvation status in taste aversion learning of a pond snail Etsuro Ito1*, Koichi Mita1, Dai Hatakeyama1, Ryuichi Okada1, Mika Morikawa1, Yuki Sakamoto1, Miki Yamagishi1 and Akiko Okuta2 1 Tokushima Bunri University, Kagawa School of Pharmaceutical Science, Japan 2 Kyoto University, Graduate School of Science, Japan The pond snail Lymnaea stagnalis acquires taste aversion learning and maintains it as a long-term memory (LTM) referred to as conditioned taste aversion. In the present study, we examined the relationship among learning ability, starvation period and hemolymph glucose concentration in taste aversion learning. One-day mild starvation improves the learning score and keeps good LTM, but 5-day heavy starvation failed the snails to learn the taste aversion. During this 5-day starvation period, the hemolymph glucose concentration appeared to decrease. On the other hand, when we injected glucose into the abdominal cavity or fed sucrose to 1-day mild starved snails for a short period, the snails showed worse scores than the case of no injection or ingestion. Further, when mammalian insulin was injected into snails with a complete bellyful of food, the hemolymph glucose concentration decreased and the learning score and LTM were improved. The number of insulin-like receptors in the Lymnaea brain was not changed by taste aversion learning. These results showed that learning ability depends on the starvation period and the hemolymph glucose concentration and that learning ability can be controlled by direct manipulation of hemolymph glucose concentration or injection of insulin in taste aversion learning of Lymnaea. Keywords: Lymnaea, conditioned taste aversion, Glucose, Insulin, Starvation Conference: Tenth International Congress of Neuroethology, College Park. Maryland USA, United States, 5 Aug - 10 Aug, 2012. Presentation Type: Poster (but consider for Participant Symposium) Topic: Learning, Memory and Behavioral Plasticity Citation: Ito E, Mita K, Hatakeyama D, Okada R, Morikawa M, Sakamoto Y, Yamagishi M and Okuta A (2012). Relationship between learning ability and starvation status in taste aversion learning of a pond snail. Conference Abstract: Tenth International Congress of Neuroethology. doi: 10.3389/conf.fnbeh.2012.27.00088 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 18 Apr 2012; Published Online: 07 Jul 2012. * Correspondence: Prof. Etsuro Ito, Tokushima Bunri University, Kagawa School of Pharmaceutical Science, Sanuki, 769-2193, Japan, eito@waseda.jp Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Etsuro Ito Koichi Mita Dai Hatakeyama Ryuichi Okada Mika Morikawa Yuki Sakamoto Miki Yamagishi Akiko Okuta Google Etsuro Ito Koichi Mita Dai Hatakeyama Ryuichi Okada Mika Morikawa Yuki Sakamoto Miki Yamagishi Akiko Okuta Google Scholar Etsuro Ito Koichi Mita Dai Hatakeyama Ryuichi Okada Mika Morikawa Yuki Sakamoto Miki Yamagishi Akiko Okuta PubMed Etsuro Ito Koichi Mita Dai Hatakeyama Ryuichi Okada Mika Morikawa Yuki Sakamoto Miki Yamagishi Akiko Okuta Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.