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Developmental Changes in Conditioned Taste Aversion in Lymnaea stagnalis
| 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 |
| Relation: | http://www.bioone.org/perlserv/?request=get-archive&issn=0289-0003 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/32935 |
| 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)
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Submitter: 山下 正兼
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