ピッチシフト中の音声への適応応答は、再学習により減弱する
Jessica L Gaines1, Corby L Dale2, John F Houde3
1UC Berkeley - UCSF Graduate Program in Bioengineering, San Francisco, CA, United States.
Frontiers in human neuroscience
|January 23, 2026
まとめ
音声基本周波数(f0)制御は、運動学習と同様の減弱効果を示す。ピッチエラーへの再学習反応は、単一セッション内での繰り返し曝露により減少する。
科学分野:
- 音声運動制御
- 聴覚フィードバック処理
- 暗黙的学習
背景:
- 感覚運動適応は、感覚エラーに行動を調整することを含む。
- 以前の研究では、腕のリーチングタスクにおける学習解除と再学習が検討された。
- 単一セッション内での音声ピッチ(f0)の再学習は、あまり研究されていない。
研究 の 目的:
- 音声f0制御における再学習メカニズムを調査する。
- 音声における変化した聴覚フィードバックへの適応を調べる。
- f0制御が暗黙的学習特性を示すかどうかを判断する。
主な方法:
- 参加者は、通常のピッチシフト聴覚フィードバックと交互に行われる単語音声タスクを実行した。
- f0シフトおよびシフトされていないフィードバックの3つのブロックが提示された。
- ピッチエラーへの適応の大きさを測定した。
主要な成果:
- 適応の大きさは、ピッチシフトフィードバックの連続ブロック間で減少した。有意な減弱効果が観察され、後のブロックでの適応が減少した。このパターンは、腕の動きの暗黙的運動学習における所見を反映している。
結論:
- 音声f0制御は、暗黙的学習の特性を示す。
- 今回の発見は、ピッチ制御の再学習が減弱の影響を受けることを示唆している。
- この研究は、音声f0制御を感覚運動制御のより広範な枠組みに統合するものである。
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