聲壓級與訊噪比對頻譜及時間調變偵測中噪音適應的影響

// The effect of sound level and signal-to-noise ratio on adaptation to noise in spectral and temporal modulation detection

白噪音中測試200 ms光譜（2 cyc/oct）與時間（10 Hz）調變的適應｜光譜適應穩健：45/60/75 dB 全顯著，SNR -10 至 +10 dB 中僅 +5 dB 不顯著；時間適應有限：僅於60、75 dB 及 SNR -10、0 dB 顯著｜適應受信號水準與 SNR 影響，兩類線索顯示不同機制，對聽覺處理與噪音環境設計具實務應用價值。

// The study tested whether adaptation to noise in detecting spectral (2 cycles/oct) and temporal (10 Hz) modulations depends on signal level or SNR. Listeners detected 200-ms modulated ripple signals in white noise with early (50 ms) or late (800 ms) noise onset; adaptation was the improvement in detection threshold in the late condition, with Experiment 1 varying signal level (45/60/75 dB SPL at 0 dB SNR) and Experiment 2 varying SNR (-10 to +10 dB at 60 dB masker). Spectral-modulation adaptation was robust (significant at all levels and at all tested SNRs except +5 dB), while temporal-modulation adaptation was limited (significant only at 60 and 75 dB SPL and only at -10 and 0 dB SNR). These results show adaptation depends on level and SNR and differs for spectral versus temporal cues, implying different underlying mechanisms.

Published 2026年9月3日