Negative Relationship between Odor-Induced Spike Activity and Spontaneous Oscillations in the Primary Olfactory System of the Terrestrial Slug Limax marginatus(Neurobiology)

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概要

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• Although primary olfactory systems in various animals display spontaneous oscillatory activity, its functional significance in olfactory processing has not been elucidated. The tentacular ganglion, the primary olfactory system of the terrestrial slug Limax marginatus, also displays spontaneous oscillatory activity at 1-2Hz. In the present study, we examined the relationship between odor-evoked spike activity and spontaneous field potential oscillations in the tentacular nerve, representing the pathway from the primary olfactory system to the olfactory center. Neural activity was recorded from the tentacular nerve before, during and after application of various odors (garlic, carrot, and rat chow) to the sensory epithelium and the changes in firing rate and spontaneous oscillations were analyzed. We detected the baseline amplitude of the oscillations and baseline spike activity before stimulation. Odor stimulations for 20 s or 60 s evoked a transient increase in the firing rate followed by a decrease in the amplitude of spontaneous oscillations. The decrease in the amplitude was larger in the first 8 s of stimulation and subsequently showed recovery during stimulation. The amplitude of the recovered oscillations often fluctuated. Odor-evoked spikes appeared when the amplitude of the recovered oscillations was transiently small. These results suggest that the large oscillations could inhibit spike activity whereas the first transient increase in spike activity was followed by the decrease in the oscillation amplitude. Our results indicate that there is a significant negative correlation between spontaneous oscillations and odor-evoked spike activity, suggesting that the spontaneous oscillations contribute to the olfactory processing in slugs.

• 社団法人日本動物学会の論文
• 2003-11-25

著者

• 伊藤 悦朗

  Kagawa School Of Pharmaceutical Science Tokushima Bunri University

• Ito Etsuro

  北海道大学 理研究

• Ito Etsuro

  Laboratory of Animal Behavior and Intelligence, Division of Biological Sciences, Graduate School of

• Ito Etsuro

  Laboratory Of Animal Behavior And Intelligence Division Of Biological Sciences Graduate School Of Sc

• Ito Iori

  Laboratory of Animal Behavior and Intelligence, Division of Biological Sciences, Graduate School of

• Watanabe Satoshi

  Laboratory of Neurobiophysics, Graduate School of Pharmaceutical Sciences, The University of Tokyo

• Kimura Tetsuya

  Brain-Operative Expression Laboratory, Brain Science Institute

• Kirino Yutaka

  Laboratory of Neurobiophysics, Graduate School of Pharmaceutical Sciences, The University of Tokyo

• 桐野 豊

  徳島文理大院・香川薬・生物物理:阪大院・医・細胞神経科学

• 桐野 豊

  徳島文理大学:香川薬学部:神経科学研究所:生物物理学会四国支部:東京大学

• 桐野 豊

  東京大学 薬

• Ito E

  Divisions Of Biological Sciences Hokkaido University

• Ito E

  Kagawa School Of Pharmaceutical Science Tokushima Bunri University

• Ito Iori

  Laboratory Of Animal Behavior And Intelligence Division Of Biological Sciences Graduate School Of Sc

• Ito I

  Hokkaido Univ. Sapporo Jpn

• Kirino Y

  Graduate School Of Pharmaceutical Sciences University Of Tokyo

• Kirino Y

  Univ. Tokyo Tokyo Jpn

• Kirino Y

  Graduate School Of Pharmaceutical Sciences Graduate School Of Medicine The University Of Tokyo

• Kirino Yutaka

  Laboratory Of Neurobiophysics Graduate School Of Pharmaceutical Sciences The University Of Tokyo

• Kirino Yutaka

  Faculty Of Pharmaceutical Sciences Kyushu University

• Ito E

  Division Of Innovative Research Creative Research Initiative "sousei" Hokkaido University:

• Watanabe Satoshi

  Graduate School Of Pharmaceutical Sciences University Of Tokyo

• Watanabe S

  Graduate School Of Pharmaceutical Sciences University Of Tokyo

• Kitahashi T

  Brain-operative Expression Laboratory Brain Science Institute

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