Fujihira H, Shiraishi K
Department of Human Science, Graduate School of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan.
Department of Communication Design Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan.
Clin Neurophysiol. 2015 Jan;126(1):96-102. doi: 10.1016/j.clinph.2014.05.001. Epub 2014 May 16.
To investigate the relationship between speech auditory brainstem responses (speech ABRs) and word intelligibility under reverberation in elderly adults.
Word intelligibility for words under four reverberation times (RTs) of 0, 0.5, 1.0, 1.5s, and speech ABRs to the speech syllable/da/ were obtained from 30 elderly listeners. Root mean square (RMS) amplitudes and discrete Fourier transform (DFT) amplitudes were calculated for ADD and SUB responses in the speech ABRs.
No significant correlations were found between the word intelligibility scores under reverberation and the ADD response components. However, in the SUB responses we found that the DFT amplitudes associated with H4-SUB, H5-SUB, H8-SUB, H9-SUB and H10-SUB significantly correlated with the word intelligibility scores for words under reverberation. With Bonferroni correction, the DFT amplitudes for H5-SUB and the intelligibility scores for words with the RT of 0.5s and 1.5s were significant.
Word intelligibility under reverberation in elderly listeners is related to their ability to encode the temporal fine structure of speech.
The results expand knowledge about subcortical responses of elderly listeners in daily-life listening situations. The SUB responses of speech ABR could be useful as an objective indicator to predict word intelligibility under reverberation.
研究老年人在混响环境下言语听觉脑干反应（言语ABR）与单词可懂度之间的关系。
从30名老年受试者中获取在0、0.5、1.0、1.5秒四个混响时间（RT）下单词的可懂度，以及对语音音节/da/的言语ABR。计算言语ABR中ADD和SUB反应的均方根（RMS）幅值和离散傅里叶变换（DFT）幅值。
混响下的单词可懂度得分与ADD反应成分之间未发现显著相关性。然而，在SUB反应中，我们发现与H4-SUB、H5-SUB、H8-SUB、H9-SUB和H10-SUB相关的DFT幅值与混响下单词的可懂度得分显著相关。经Bonferroni校正后，H5-SUB的DFT幅值与RT为0.5秒和1.5秒时单词的可懂度得分具有显著性。
老年受试者在混响环境下的单词可懂度与其对言语时间精细结构的编码能力有关。
这些结果扩展了关于老年受试者在日常生活聆听情境下皮质下反应的知识。言语ABR的SUB反应可作为预测混响下单词可懂度的客观指标。
