Acoustic simulations of combined electric and acoustic hearing (EAS)
Acoustic simulations of combined electric and acoustic hearing (EAS)
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DOI：
10.1097/00003446-200508000-00001
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发表时间：
2005-08-01
期刊：
影响因子：
3.7
通讯作者：
Schmidt, JS
中科院分区：
文献类型：
--
作者：
Dorman, MF;Spahr, AJ;Schmidt, JS
目的：我们的目的是探讨在听觉区域和电刺激区域之间留下频率间隙对言语理解的影响。我们的研究进行了与正常听力的听众，使用的电和声（EAS）stimulation.Design相结合的声学模拟：EAS的模拟创建低通滤波语音在0.5 kHz（90 dB倍频程滚降），并添加调幅正弦波在更高的频率。声学听力和模拟电听力之间的频率的差距在0.5 kHz至3.2 kHz的范围内变化。刺激包括安静的句子，噪音的句子，辅音和元音。三个实验进行了12 listeners.Results的样本量：分数最高的条件下，最大限度地减少声电刺激之间的频率差距。安静时，元音和辅音的发音部位对频率差的敏感性最高。在噪声中，模拟EAS条件下的得分高于仅声学和模拟电条件下的得分之和。我们的研究结果表明，深和浅的电极插入可以提高残余听力到500 Hz的患者的言语理解能力。然而，如果声刺激和电刺激之间的差距最小化，则性能水平将最大化。
Objective: Our aim was to explore the consequences for speech understanding of leaving a gap in frequency between a region of acoustic hearing and a region stimulated electrically. Our studies were conducted with normal-hearing listeners, using an acoustic simulation of combined electric and acoustic (EAS) stimulation.Design: Simulations of EAS were created by low-pass filtering speech at 0.5 kHz (90 dB octave roll-off) and adding amplitude-modulated sine waves at higher frequencies. The gap in frequency between acoustic and simulated electric hearing was varied over the range 0.5 kHz to 3.2 kHz. Stimuli included sentences in quiet, sentences in noise, and consonants and vowels. Three experiments were conducted with sample sizes of 12 listeners.Results: Scores were highest in conditions that minimized the frequency gap between acoustic and electric stimulation. In quiet, vowels and consonant place of articulation showed the most sensitivity to the frequency gap. In noise, scores in the simulated EAS condition were higher than the sum of the scores from the acoustic-only and simulated electric-only conditions.Conclusions. Our results suggest that both deep and shallow insertions of electrodes could improve the speech understanding abilities of patients with residual hearing to 500 Hz. However, performance levels will be maximized if the gap between acoustic and electric stimulation is minimized.