摘 要
本研究以實驗法探討下列兩個問題：(一) 鼻輔音與過渡音徵可否提供足夠的鼻音訊息供受試者判斷音節鼻音性。(二) 鼻輔音與過渡音徵能否構成堅定的鼻音感知線索。
本研究執行了兩個感知實驗，一個是Gating 的實驗，另一個是感知線索衝突的實驗(cue-conflicting experiment)。在Gating的實驗部分，我們將閩南語鼻音音節(NV)切成三段：鼻輔音、過渡音徵(formant transition)、穩態發聲(steady-state portion)，並剪輯出鼻輔音、鼻輔音加過渡音徵、完整音節三類刺激項，然後播放給受試者聽，請他們判斷他們聽到的是口音音節(oral syllable)還是鼻音音節(nasal syllable)，並標示其信心指數。在感知線索衝突實驗部分，我們將上述三段各以口音性及鼻音性呈現，造成八種形式的音節，其中六種是鼻音性不一致的音節，我們想知道鼻輔音、過渡音徵、穩態發聲對於鼻音感知個別的貢獻如何。
研究結果顯示：在自然語音的感知中，有過半的鼻音節在僅提供鼻輔音與過渡音徵的情況下，就能被完全確認；再者，在提供鼻輔音與過渡音徵的情況下有超過九成的鼻音節會被聽出來。在鼻音性不一致的音節感知實驗中，被認為是鼻音音節百分比最高的是由「鼻輔音+鼻過渡音徵+口穩態發聲」所構成的音節，辨識率約有六成四，在口音性佔了音節長度三分之二的情況下，仍舊有六成四的鼻音音節被認出，可見鼻輔音與過渡音徵應該足以構成一堅定的鼻音感知線索。此外，我們發現在鼻音性不一致的音節感知上，鼻輔音能否對鼻音感知發揮作用端視後頭有無鼻音而定，得在後頭有鼻音性的情況下才得以發揮作用。至於過渡音徵對鼻音感知的作用則只有在前頭有鼻輔音的情況下才得以發揮，至於穩態發聲，完全不受任何限制。

ABSTRACT
The objective of the present study is twofold. First, we wonder whether the nasal consonant and the formant transition provide sufficient nasality information for nasality judgment. Second, we wonder whether the nasal consonant and the formant transition form a robust nasality cue.
Two perceptual experiments were thus conducted. The former was a gating experiment. The latter was a cue-conflicting experiment. In the gating experiment, the CV syllables were edited into three forms: the consonant, the consonant plus the formant transition, and the complete syllable. Then stimuli were submitted to subjects for nasality judgment. In the cue-conflicting experiment, two alternatives (oral/nasal) for each part (the consonant, the transition, and the steady-state portion) made eight possible forms. Stimuli were also submitted to subjects for nasality judgment.
Results showed that over half of the nasal stimuli were totally accepted when the nasal consonant and the transition together were provided. Besides, over ninety per cent of stimuli were identified as nasal in the same condition. In the perception of nasality inconsistent syllables, the NNO syllables elicited the most nasal responses. With more than two-thirds of the syllable was occupied by orality, sixty-four per cent of the stimuli were identified as nasal. This implied that the nasal consonant and the nasal formant transition could be a robust nasality cue. Regarding the respective contributions, the effect of the consonant failed to work unless something nasal followed. The effect of the formant transition failed to work unless it was preceded by a nasal consonant, and the effect of the steady-state portion worked in any context.

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