Forward masked excitation patterns in multielectrode electrical stimulation
Forward masked excitation patterns in multielectrode electrical stimulation
复制标题
DOI：
10.1121/1.422777
复制
发表时间：
1998-05-01
影响因子：
2.4
通讯作者：
Shannon, RV
中科院分区：
文献类型：
--
作者：
Chatterjee, M;Shannon, RV
多电极人工耳蜗植入患者的跨通道相互作用可能对他们在自然听觉环境中的表现至关重要。使用前向掩码可以获得信道交互的一种测量。在四个不同语音识别水平的植入核团的患者中，获得了阈值漂移的模式，作为掩蔽电极和探测电极对之间间隔的函数。在语音识别能力较好的三个受试者(N4、N7和N13)中，掩蔽模式对参数的依赖性最小。在语音得分最低的受试者(N3)中，掩蔽模式对掩蔽者水平和探测延迟的依赖性最大。掩蔽作为掩蔽水平的函数也反映了这些差异：N3的S功能在不同的探测延迟下表现出最大的变化。在三个表现良好的人中观察到相似的恢复率(时间常数约为70ms)。相比之下，受试者N3‘S的恢复功能恢复较快。这些数据表明，通道相互作用是个体变量和参数依赖的，这两者都可能在自然听觉环境中对动态刺激的感知中发挥作用。(C)1998年美国声学学会。
Across-channel interactions in multi-electrode cochlear implant patients may be critical to their performance in the natural auditory environment. One measure of channel interaction can be obtained using forward masking. The patterns of threshold shift were obtained as a function of the separation between masker and probe electrode pairs in four Nucleus-implanted patients with varying levels of speech recognition. In the three subjects with better speech recognition (N4, N7, and N13), the masking patterns showed the least parameter dependence. In the subject with the lowest speech scores (N3), the masking patterns showed the greatest dependence on masker level and on probe delay. Masking as a function of masker level also reflected these differences: N3's functions showed the greatest changes for different probe delays. Similar rates of recovery were observed in the three good performers (time constant approximately 70 ms). In contrast, subject N3's recovery function shows a more rapid recovery. These data indicate that channel interaction is individually variable and parameter dependent, both of which may play a role in the perception of dynamic stimuli in the natural auditory environment. (C) 1998 Acoustical Society of America.