Godfrey J J, Millay K K
J Aud Res. 1980 Jul;20(3):187-203.
Volunteers (7 men, 8 women) with mild to severe hearing losses listened by monaural earphone to 5 series of computer-synthesized speech syllables, and identified each token. Presentation level 30 db SL. The 5 series consisted of (a, b) steady-state vowels varying from to [o] and from [o] to [a], (c,d) CV syllables varying from [ba] to [wa], and from [da] to [ya], differing in the rate of formant transitions at onset, and (e) CV syllables varying from [ba] to [da] differing in both direction and extent of formant transitions from locus to vowel. All hearing-impaired Ss categorized the vowels essentially the same as normal control Ss; some had difficulty identifying the stop vs glide series, and all but 2 were unable to identify the [b-d] series normally. A few impaired Ss improved at a presentation level close to tolerable limits. Results imply a "hierarchy of difficulty" based on the nature of the spectral cue in different speech sound types.
轻度至重度听力损失的志愿者（7名男性，8名女性）通过单耳耳机收听5组计算机合成的语音音节，并识别每个音素。呈现水平为30分贝感觉级。这5组音节包括：（a，b）从[i]到[o]以及从[o]到[a]的稳态元音；（c，d）从[ba]到[wa]以及从[da]到[ya]的塞擦音音节，其起始时的共振峰过渡速率不同；（e）从[ba]到[da]的塞擦音音节，其从音位到元音的共振峰过渡方向和程度均不同。所有听力受损的受试者对元音的分类与正常对照组基本相同；一些人在识别塞音与滑音系列时存在困难，除2人外，所有人都无法正常识别[b-d]系列。少数受损受试者在接近可耐受极限的呈现水平下有所改善。结果表明，基于不同语音类型中频谱线索的性质存在“难度等级”。
