Study of vibrant realization by deaf speakers of Brazilian Portuguese

PURPOSE:to investigate in deaf bilingual individuals, the realization of vibrants in stressed syllable-final, in stressed syllable-final or unstressed in the middle of the word, in two language contexts: carrier sentence and letter.METHODS:five deaf bilingual respondents we selected, 4 female and 1 male with severe and / or deep bilateral sensorineural hearing loss, without neurological, cognitive and motor impairment, and two listeners, 01 female and 01 male. The corpus employed was divided into two phases, carrier sentences and letter reading both containing the same words. The recordings were made in the studio at Instituto Nacional de Educação de Surdos. For the analysis of the duration parameter of selected segments (vibrant), broadband spectrograms from the program PRAAT were extracted. Data obtained were statistically treated.RESULTS:the results shown in Table 1 (realization of vibrant in final stressed syllable) and Table 2 (realization of vibrant at the end of the stressed syllable in the middle of the word) show no significant difference at the 5% level, in the time spent for the achievement of vibrant in both groups.CONCLUSION:even though data observed in both investigated groups are not statistically significant at 5%, it is noticed that there is a trend of significant difference when the descriptive level (p value) was between 0.05 and 0.10. In fact, besides the acoustic analysis, the perceptual revealed a trace of vibrant more differentiated in deaf than in the hearing individuals. The findings in this study are related in the literature.

研究目的：本研究旨在探究双语聋人群体在两种实验语境（载体句与字母朗读任务）下，重读音节末尾、词中重读音节末尾或非重读音节末尾位置的颤音（vibrant）实现方式。
研究方法：本研究选取5名双语聋人被试（4名女性、1名男性），均患有重度及/极重度双侧感音神经性听力损失，无神经系统、认知及运动功能障碍；另选取2名健听评定者（1名女性、1名男性）。所用语料库分为两个实验阶段：载体句朗读与字母朗读，两类任务包含完全相同的词汇。录音工作在国家聋人教育研究所（Instituto Nacional de Educação de Surdos）的录音棚内完成。为分析选定段（颤音（vibrant））的时长参数，本研究提取了语音分析软件PRAAT生成的宽带语谱图。所得数据均经统计学处理。
研究结果：表1（重读音节末尾位置的颤音实现情况）与表2（词中重读音节末尾位置的颤音实现情况）的结果显示，两组被试在颤音完成时长上均未达到5%显著性水平的统计学差异。
研究结论：尽管两组被试的观测数据在α=0.05显著性水平下未达到统计学差异，但可观察到当p值处于0.05至0.10区间时，存在显著性差异的趋势。事实上，除声学分析外，感知分析结果显示，聋人被试的颤音表现相较于健听个体更具分化性。本研究的发现与现有文献研究结果具有相关性。