幼少期から成人期までのストリーム分離のニューラルシグネチャー
Elena Benocci1, Claude Alain2,3, Axelle Calcus4
1Center for Research in Cognitive Neuroscience (CRCN), Université Libre de Bruxelles (ULB), Brussels, Belgium. elena.benocci@ulb.be.
Scientific reports
|February 14, 2026
まとめ
騒音の中でのスピーチの理解に不可欠な聴覚シーンの分析は,幼児期と青春期を通して徐々に成熟します. オブジェクト関連ネガティビティ (ORN) とP400のような神経マーカーが発達し,ストリーム分離とスピーチ知覚能力の両方を改善します.
科学分野:
- 神経科学は神経科学である.
- 聴覚知覚とは,聴覚の知覚である.
- 発達心理学の心理学について
背景:
- 聴覚的なシーンの分析は,聴衆が背景のノイズからターゲット音を分離することを可能にします.
- 聴覚的なシーンの分析の重要な要素であるストリーム分離は,音を異なるストリームに組織することを含む.
- オブジェクト関連ネガティビティ (ORN) とP400は,ストリーム分離のニューラルシグネチャーとして識別されています.
研究 の 目的:
- ストリーム分離の神経的および行動的側面の発達軌道を調査する.
- 騒々しい環境におけるストリームセグレゲーションの発達とスピーチの知覚の間の関係を調べる.
- 聴覚的なシーンの分析の成熟を,幼児期から成人期まで理解する.
主な方法:
- アクティブ・ストリーム・セグレゲーション・タスクの8~23歳の参加者における記録されたイベント関連ポテンシャル (オブジェクト関連ネガティブ/P400).
- 騒音タスクにおけるスピーチ識別に関する行動的パフォーマンスを評価した.
- 神経系相関体の成熟 (ORN/P400) と,行動的な結果との関連を分析した.
主要な成果:
- ストリーム分離と騒音中の言語知覚の両方の行動改善は,年齢とともに観察されました.
- ORNの振幅とP400の遅延は,発達とともに減少した.
- P400の振幅は,ストリーム分離性能の有意な予測要因でした.
結論:
- ストリーム分離を支える神経機構は,長期間成熟し,成人期まで続く.
- この長時間の熟成は,難聴条件下での聴覚的な場面分析と音声知覚の発達を支えている.
- この発見は,複雑な聴覚処理能力の拡張された発達タイムラインを強調しています.
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