眠っているドラゴンの ゆっくりとした波,鋭い波,波紋,REM
Mark Shein-Idelson1, Janie M Ondracek1, Hua-Peng Liaw1
1Max Planck Institute for Brain Research, Frankfurt am Main, Germany.
まとめ
科学者たちは ワニのスローウェーブ (SW) と ラピッドアイムーブメント (REM) の睡眠パターンを発見し,これらの脳活動が以前考えられていたよりも早く 進化したことを示唆しています 恐らく 胎盤細胞の出現以前です
科学分野:
- 神経科学
- 進化生物学
- 比較生理学
背景:
- スローウェーブ (SW) とラピッドアイムーブメント (REM) の特徴を持つ睡眠は,哺乳類や鳥類でよく記録されています.
- この電気生理学的睡眠の特徴は 以前は哺乳類や鳥類に限ると考えられていた.
研究 の 目的:
- 爬虫類のSWとREM睡眠の存在と特徴を調査する.
- 哺乳類と鳥類の睡眠パターンの 進化的起源を決定する
主な方法:
- オーストラリアの龍 (Pogona vitticeps) の脳に電気生理学的記録が行われた.
- SWとREM睡眠を示す振動パターンを特定することに焦点を当てました.
主要な成果:
- SWとREM睡眠パターンが の脳で特定されました
- これらの睡眠パターンは,約80秒間の間隔で6〜10時間の連続的な振動を示しました.
- のSWダイナミクスは,ホドロロジカル類似性の欠如にもかかわらず,背中心室の脊椎から発生し,の海馬CA1と類似性を示した.
結論:
- SWとREM睡眠は少なくとも胎盤の出現まで進化したことを示唆している.
- 胎児における SW-REM 反抗を制御する古代の振動器回路は保存され得る.
- 爬虫類は以前は哺乳類や鳥類に限った 複雑な睡眠のダイナミクスを表しており 睡眠の進化に関する 新たな洞察を 提供しています
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