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Decrease in excitability of LG following habituation of the crayfish escape reaction.
Makoto Araki1, Toshiki Nagayama
1Animal Behavior and Intelligence, Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060, Japan. arakim@sci.hokudai.ac.jp
Summary
Crayfish escape responses habituate quickly but are retained briefly. Octopamine, but not serotonin or tyramine, promotes reduced excitability in lateral giant neurons following habituation.
Area of Science:
- Neuroscience
- Animal Behavior
- Crustacean Research
Background:
- Crayfish exhibit a tailflip escape reaction mediated by lateral giant (LG) neurons.
- This escape response readily habituates to repeated stimuli.
Purpose of the Study:
- To investigate the retention of habituation in crayfish LG neuron activity.
- To characterize the factors influencing the duration and recovery of LG habituation.
Main Methods:
- Utilized an isolated crayfish abdominal nerve cord preparation.
- Applied repetitive sensory stimulation at varying intervals to induce habituation.
- Administered octopamine, serotonin, or tyramine to assess their effects on LG excitability post-habituation.
Main Results:
- LG habituation retention is inversely related to the inter-stimulus interval; shorter intervals lead to quicker habituation but shorter retention.
- LG neurons recover quickly but can exhibit a prolonged decrease in excitability after habituation.
- Octopamine injection post-habituation promoted this decreased excitability, while serotonin and tyramine had no effect.
Conclusions:
- Octopamine plays a role in promoting the decreased excitability of LG neurons following habituation.
- The timing of stimuli critically influences the persistence of habituation in the crayfish escape circuit.