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为研究电子耳蜗刺激信号在人耳蜗内的频域分辨率,记录3种刺激模式在7位受试者耳蜗内的电场成像(EFI),并分析刺激模式和幅度对其影响。结果显示:蜗内电场成像(μV)从刺激电极向蜗顶和蜗底两侧指数衰减,而两侧特征参数显著相关(p<0.01),说明电场成像沿电极组方向对称分布。刺激模式对电场成像有显著影响(p<0.01),但不受刺激幅度的干扰。较于单极模式,多电极刺激模式的电场成像更集中,频域分辨率更高。但双极模式的电场成像不对称,双极和三极模式的耗电量过大。电子耳蜗使用者对不同刺激模式的感知能力还有待进一步研究。
To investigate the frequency resolution of cochlear stimuli in the human cochlea, electric field imaging (EFI) of three stimulus patterns in the cochlea of seven subjects was recorded and the effect of stimulus pattern and amplitude was analyzed. The results showed that the electric field imaging (μV) in the cochlear implants exponentially decayed from the stimulation electrode to the apical and cochlear sides, while the characteristic parameters on both sides were significantly correlated (p <0.01), indicating that electric field imaging was symmetrically distributed along the electrode group. Stimulation patterns have a significant effect on electric field imaging (p <0.01), but are not disturbed by the stimulation amplitude. Compared with the unipolar mode, multi-electrode stimulation mode electric field imaging more focused, higher frequency domain resolution. But bipolar mode electric field imaging asymmetry, bipolar and three-pole mode power consumption is too large. Cochlear user awareness of different stimulus patterns remains to be further studied.