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Developmental Changes in Conditioned Taste Aversion in Lymnaea stagnalis

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Title: Developmental Changes in Conditioned Taste Aversion in Lymnaea stagnalis
Authors: Yamanaka, Mari Browse this author
Sadamoto, Hisayo Browse this author
Hatakeyama, Dai Browse this author
Nakamura, Hiroshi Browse this author
Kojima, Satoshi Browse this author
Kimura, Tetsuya Browse this author
Yamashita, Masakane Browse this author
Urano, Akihisa Browse this author
Ito, Etsuro Browse this author
Issue Date: Feb-1999
Publisher: 日本動物学会
Journal Title: Zoological Science
Volume: 16
Issue: 1
Start Page: 9
End Page: 16
Abstract: As the first step to study relationships between development and learning in the molluscan central nervous system,we examined developmental changes in acquisition and retention of a conditioned taste aversion (CTA) in the pond snail, Lymnaea stagnalis. We found that snails developed ability of a CTA as a long-term memory through three critical stages. Embryos in veliconcha started to respond to appetitive sucrose at the first critical stage. This response was in good agreement with morphological observations that embryos at this developmental stage seemed to be physically ready to eat. However, they could not associate this appetitive stimulus (conditioned stimulus: CS) with an aversive stimulus of KCI (unconditioned stimulus: UCS). At the second critical stage, embryos just before hatching acquired the CTA, but the conditioned response did not persist. Through this stage, they may acquire learning ability to safely seek out food in an external environment. At the third critical stage, immature snails with a 10 mm shell could use a long-term memory to maintain the conditioned response. This memory persisted for at least a month, showing that now they are able to maintain a long-term memory so that they can safely eat a variety of food when they cover wide territory to search for a mate. The present findings indicate that the development of learning ability in snails, which secures acquisition of better survival ability, is coincident with the major changes in their life cycle.
Rights: (c) 日本動物学会 / 本文献の公開は著者の意思に基づくものである
Type: article
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山下 正兼

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