Changes in pitch with a cochlear implant over time
Changes in pitch with a cochlear implant over time
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DOI：
10.1007/s10162-007-0077-8
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发表时间：
2007-06-01
影响因子：
2.4
通讯作者：
Gantz, Bruce J.
中科院分区：
文献类型：
--
作者：
Reiss, Lina A. J.;Turner, Christopher W.;Gantz, Bruce J.
在正常的听觉系统中，音调的感知音高与耳蜗振动的位置密切相关。通常假设耳蜗植入电极的高速率电刺激也引起与电极的耳蜗位置（“位置”代码）和刺激速率（“时间”代码）相对应的音高感觉。然而，其他因素可能会影响电音高感觉，例如附近神经纤维的大量损失或甚至由于经验引起的更高级别的感知变化。本研究的目的是测量混合短电极人工耳蜗植入患者的电音高感觉，并检查哪些因素可能有助于感知音高。为了观察经验的影响，将电音高感觉与在植入物使用的不同阶段（从连接到5年）向非植入耳提供的声学音调参考进行了比较。在这里，我们表明，在植入物使用的最初几年，电音高感知经常发生频率变化，有时多达两个八度。在较短的时间间隔LIP到I年的植入物上升时，最近植入的患者的额外音高测量结果表明，这些观察到的音高变化可能有两个原因：会话间变异性（尖端到一个八度）和随时间推移的缓慢系统性变化。我们还发现，对于一个恒定的电极位置的早期音高感觉可以有很大的不同科目，这些变化与语音接收性能密切相关。具体而言，与具有早期高音感觉的患者相比，具有早期低音感觉的患者倾向于使用植入物表现不佳，这可能与低音患者耳蜗基底端的神经存活较少有关。与此相反，晚期音高感觉与言语感知没有相关性。这些结果共同表明，前），音高感觉可能更密切地反映外周神经支配模式，而后来的音高感觉可能反映更高层次的，经验依赖性的变化。这些音高随时间的变化不仅对严格的基于位置的音高感知理论提出了质疑，而且还意味着经验对人工耳蜗感知的影响可能比以前认为的更大。
In the normal auditory system, the perceived pitch of a tone is closely linked to the cochlear place of vibration. It has generally been assumed that highrate electrical stimulation by a cochlear implant electrode also evokes a pitch sensation corresponding to the electrode's cochlear place ("place" code) and stimulation rate ("temporal" code). However, other factors may affect electric pitch sensation, such as a substantial loss of nearby nerve fibers or even higher-level perceptual changes due to experience. The goals of this study were to measure electric pitch sensations in hybrid short-electrode) cochlear implant patients and to examine which factors might contribute to the perceived pitch. To look at, effects of experience, electric pitch sensations were compared with acoustic tone references presented to the non-implanted ear at various stages of implant Use, ranging from hookup to 5 years. Here, we show that electric pitch perception often shifts in frequency, sometimes by as much as two octaves, during the first few years of implant use. Additional pitch measurements in more recently implanted patients at shorter time intervals LIP to I year of implant rise suggest two likely contributions to these observed pitch shifts: intersession variability (tip to one octave) and slow, systematic changes over time. We also Found that the early pitch sensations for a constant electrode location can vary greatly across subjects and that these variations are strongly correlated with speech reception performance. Specifically, patients with an early low-pitch sensation tend to perform poorly with the implant compared to those with an early high-pitch sensation, which may be linked to less nerve survival in the basal end of the cochlea in the low-pitch patients. In contrast, late pitch sensations show no correlation with speech Perception. These results together suggest that earl), pitch sensations may more closely reflect peripheral innervation patterns, while later pitch sensations may reflect higher-level, experience-dependent changes. These pitch shifts over time not only raise questions for strict place-based theories of pitch perception, but also imply that experience may have a greater influence on cochlear implant perception than previously thought.