McKay C M, McDermott H J, Clark G M
Department of Otolaryngology, University of Melbourne, Australia.
J Acoust Soc Am. 1994 Nov;96(5 Pt 1):2664-73. doi: 10.1121/1.411377.
The percepts elicited by electrical stimulation of auditory neurons by trains of amplitude-modulated current pulses were studied in a group of six cochlear implant users. Modulation frequencies of 100, 150, and 200 Hz were studied, with a range of carrier rates up to 1200 Hz. It was found that all but one subject could consistently rank 150- and 200-Hz modulated stimuli by modulation frequency when the carrier rate was more than 800 Hz, but for lower carrier rates the ranking was greatly affected by the harmonic relationship between carrier and modulation frequency. Pitch matching experiments showed that the subjects generally considered the modulated stimuli to be equal in pitch to unmodulated stimuli with rates the same as, or somewhat higher than, the modulation frequency. The results showed that the "pitch" of pulsatile electrical stimulation resulting from periodicities in the time structure of the electrical stimulus has similarities to the "pitch" observed for temporal patterns in acoustic stimulation such as amplitude-modulated noise. There were some differences, however, which may be attributable at least in part to the physiological response differences for electric and acoustic stimulation.
在一组六名人工耳蜗使用者中，研究了由调幅电流脉冲序列对听觉神经元进行电刺激所引发的感知。研究了100、150和200赫兹的调制频率，载波频率范围高达1200赫兹。结果发现，除一名受试者外，当载波频率超过800赫兹时，其他所有受试者都能根据调制频率一致地对150赫兹和200赫兹的调制刺激进行排序，但对于较低的载波频率，排序会受到载波频率与调制频率之间谐波关系的极大影响。音高匹配实验表明，受试者通常认为调制刺激的音高与未调制刺激的音高相等，未调制刺激的频率与调制频率相同或略高于调制频率。结果表明，由电刺激时间结构中的周期性产生的脉动电刺激的“音高”，与在诸如调幅噪声等声刺激的时间模式中观察到的“音高”具有相似性。然而，也存在一些差异，这至少部分可能归因于电刺激和声学刺激的生理反应差异。
