// Excess Vowel Fusion in Hearing-Impaired Listeners Across Fundamental Frequency and Spatial Separation in the Free Field: An Alternative Mechanism for Difficulties With Speech in Noise
本研究探討揚聲器播放環境中，語音元音融合現象是否如耳機般發生｜結果顯示正常聽力者在自由場中元音融合較少，特別是頻率差異明顯時｜聽損者則持續呈現高元音融合率，顯示其語音分辨困難在自然環境仍存在，影響日常聽力理解。
// This study examined whether vowel fusion and averaging occur with sounds presented from loudspeakers in a free-field environment, as previously seen with headphones. Synthesized vowels with varying fundamental frequencies were played from ±60° angles, and listeners reported hearing one or two vowels. Normal-hearing listeners showed less vowel fusion in free field compared to headphones, especially when vowel frequencies differed, while hearing-impaired listeners continued to experience high vowel fusion regardless of frequency differences. The results highlight that hearing-impaired individuals have persistent fusion issues affecting speech segregation even in more natural listening conditions.
Published 2026年7月25日
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