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母音の知覚が時間的に近接した別の母音の影響で変化する現象 (文脈効果) の大きさを、3連続合成母音の中心母音と定常母音 (比較刺激) とを被験者にマッチングさせることより測定した。刺激音は、F1の値によって、3連続合成母音の中心母音、その両側の母音、比較刺激それぞれの音韻性を変化させたものを用い、音韻性と文脈効果の大きさの関係について調べている。その結果、1)比較刺激の音韻性、および中心母音の両側の母音の音韻性がよいと文脈効果は大きい、2) 3連続母音の中心母音のF1がカテゴリ中心から約1ERB程度、その両側母音方向に位置する場合に文脈効果が最も大きい、ことがわかった。
Two vowel-matching experiments were performed to examine how the phonemic quality of matching references and/or preceding and following anchors affects central vowel perception. Experiment 1 measured the Perceptual shift related to reference and anchor conditions and Experiment 2 measured the perceptual shift related to the distance between the center-vowel and its prototype. The results of the two experiments suggest that: If the reference stimulus was phoneme-like, the subjects could compare the phonemic quality of the reference and the center-vowel and if not, they could compare their timbres. Thus, large amounts of extrapolation occurred when judging phoneme categories. The results of Experiment 2 show that the amounts of overshoot. varied as a function of the difference between the center-vowel and its prototype. The F1 frequency of the center-vowel at the maximum overshoot point was 0.6〜1.2 ERB below that of the prototype. Since the amount of overshoot at this point was 0.6〜0.8 ERB, the reduced central vowel could approach its prototype perceptually.
