Department of Medical Bionics, University of Melbourne, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia.
The Bionics Institute, 384-388 Albert Street, East Melbourne, Victoria 3002, Australia.
J Acoust Soc Am. 2018 Feb;143(2):1214. doi: 10.1121/1.5025048.
The perception of temporal amplitude modulations is critical for speech understanding by cochlear implant (CI) users. The present study compared the ability of CI users to detect sinusoidal modulations of the electrical stimulation rate and current level, at different presentation levels (80% and 40% of the dynamic range) and modulation frequencies (10 and 100 Hz). Rate modulation detection thresholds (RMDTs) and amplitude modulation detection thresholds (AMDTs) were measured and compared to assess whether there was a perceptual advantage to either modulation method. Both RMDTs and AMDTs improved with increasing presentation level and decreasing modulation frequency. RMDTs and AMDTs were correlated, indicating that a common processing mechanism may underlie the perception of rate modulation and amplitude modulation, or that some subject-dependent factors affect both types of modulation detection.
对时间幅度调制的感知对于人工耳蜗（CI）使用者的言语理解至关重要。本研究比较了 CI 用户检测电刺激率和电流水平的正弦调制的能力，调制频率（10 和 100 Hz）和呈现水平（动态范围的 80%和 40%）不同。测量并比较了速率调制检测阈值（RMDT）和幅度调制检测阈值（AMDT），以评估两种调制方法是否具有感知优势。随着呈现水平的增加和调制频率的降低，RMDT 和 AMDT 都得到了改善。RMDT 和 AMDT 相关，表明可能存在共同的处理机制来感知速率调制和幅度调制，或者一些依赖于个体的因素影响两种调制检测。
