Learning of leg position in crayfish using magnetic stimulation

• Chiba Atsushi

  Dept. Physiol. Kinki Univ. Sch. Med. Osaka-Sayama, Osaka, Japan

• Oshio Ken-ichi

  Dept. Physiol. Kinki Univ. Sch. Med. Osaka-Sayama, Osaka, Japan

• Inase Masahiko

  Dept. Physiol. Kinki Univ. Sch. Med. Osaka-Sayama, Osaka, Japan

Bibliographic Information

Other Title

• 磁気刺激によるザリガニの歩脚位置学習

Abstract

Twenty-six experimental crayfish were trained to maintain a leg position above a specified level, below which the animal received the electric or magnetic shock. The training limit was five 20-min training sessions, each of which was followed by a 10-min rest period. During the training period, a yoke-control animal was arranged in a series with the experimental animal, and received a pattern of aversive stimuli identical to that received by the experimental animal but independent of its own leg positions. The commonest learning course was characterized by sudden and steep improvement of performance by electric stimulation, although gradual improvement was observed in some animals by magnetic stimulation. There are variations in the performance among specimens: some avoided the shocks by maintaining, the raised leg positions; in others the periods of raising legs were interrupted by periods of gradual lowering of the leg resulting in several shocks. Three yoke-controls also acquired appropriate leg positions, but this probably resulted from accidental association between the leg position and the shock. Crayfish with disconnected cephalic ganglion trained on leg position learning also learned to avoid magnetic shocks within one or two training sessions. The demonstration of leg position learning in the crayfish by magnetic stimulation enhances the utility of this animal as a model for the detailed analysis of neural mechanisms underlying behavioral plasticity. [J Physiol Sci. 2008;58 Suppl:S95]

Journal

• Proceedings of Annual Meeting of the Physiological Society of Japan

  Proceedings of Annual Meeting of the Physiological Society of Japan 2008 (0), 095-095, 2008

  PHYSIOLOGICAL SOCIETY OF JAPAN

Keywords

• magnetic stimulation
• leg position
• crayfish
• learning

Details

• CRID: 1390001205730060928
• NII Article ID: 130007039594
• DOI: 10.14849/psjproc.2008.0.095.1
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed