ニューラル・スパイク・トレインの相関は,発射速度とともに増加する
Jaime de la Rocha1, Brent Doiron, Eric Shea-Brown
1Center for Neural Science, New York University, New York 10003, USA. jrocha@cns.nyu.edu
Nature
|August 19, 2007
まとめ
ニューロンの発火速度は,変性ではなく,ニューロン間の相関したスパイクを決定する. この発見は,神経細胞の発火率と相関する活動との間の根本的な関連性を明らかにし,神経コードの理解に影響を与えています.
科学分野:
- 神経科学は神経科学である.
- 計算神経科学とは
背景:
- ニューロンのアクションポテンシャル (スパイク・トレイン) の時間的な相関は,様々な脳領域で観察されています.
- 相関発火は,刺激のコーディング,注意,運動制御などの重要な機能に関与しています.
- コレレートされたスパイキングの正確なメカニズムとコーディングの含意は,特に入力特性の影響は,まだ完全に理解されていません.
研究 の 目的:
- スパイクトレインの出力相関が,入力電流相関のみに依存するか,または入力平均値と振幅にも依存するかどうかを調べる.
- 神経ネットワークにおける入力相関,発射率,出力相関の関係を解明する.
主な方法:
- 計算されたスパイク・トレインの相関係数,相関入力を受け取るインビトロ皮質ニューロンの無接続のペアについて.
- "統合・発火"ニューロンモデルを用いた分析技術と数値シミュレーションを行いました.
- 標準的な値線形ニューロンモデルを使用して検証された結果.
主要な成果:
- スパイク・トレインの出力相関は,入力相関が一定であった場合でも,発火率とともに増加した.
- アウトプットの相関は,スパイク・トレインの変動から大きく独立していた.
- 出力相関と発火率の間の観察された関係は,入力異質性に対して堅牢であることが示されました.
結論:
- ニューロンの発火速度は,入力変数ではなく,相関性スパイクの重要な決定因子です.
- この研究は,発火率と神経活動の相関の間の,以前見過ごされていた重要な関係を明らかにしています.
- 発見は,神経コードの2つの基本的な側面,すなわちスパイク率と相関を結びつけ,より統一された理解を提供している.
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