本論文目的在於討論吸煙和噪音如何影響普通話母語人士在由不同說話發出摩擦音的情境下的聽辨表現。研究採用了兩選項強制選擇題作為研究方法。 15名吸煙者及15名非吸煙者需在四種特定說話者噪音中選擇他們所聽到的實驗音檔為/ʂ/還是/s/。我們分析了受試者的反應時間、正確率、敏感度（d'分數）。研究結果指出，在反應時間上，吸菸對於受試者有負面影響，而噪音對摩擦音的分辨有著正面影響。正確率方面，吸菸對於受試者同樣有負面影響。噪音對/ʂ/的聽辨有負面影響，但對/s/的聽辨有正面影響。在敏感度上，d'分數顯現了吸煙者的劣勢。噪音對於吸菸者有正面影響但對非吸菸者有負面影響。簡言之，本研究發現吸菸對於摩擦音聽辨一致有負面影響，但由噪音造成的影響會因其他因素而異。

The aim of this thesis was to determine the effect of smoking and noise on Mandarin native listeners' identification rate of sibilants produced by multiple speakers. A two-alternative forced choice identification task was used where 15 smokers and 15 non-smokers had identified whether a sound embedded in four levels of speaker-specific noises was /ʂ/ or /s/. Their reaction time, accuracy and sensitivity (d' scores) were measured. With regard to reaction time, we found the disadvantage of smoking and the advantage of speaker-specific noise on the identification of sibilants. Performance accuracy reflected a negative effect of smoking, a negative effect of speaker-specific noise on /ʂ/ perception, but a positive effect of noise on the perception of /s/. D' scores indicated the disadvantage of smoking, the advantage of speaker-specific noise for smokers and disadvantage of speaker-specific noise for non-smokers. In conclusion, smoking was commonly found to have a detrimental effect of on Mandarin sibilant perception. The effect of noise, on the other hand, seemed to vary depending on other factors.

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