电刺激耳蜗记录下丘的空间调谐曲线

探索耳蜗电刺激的听觉中枢电活动机理，为多道人工耳蜗电刺激的部位代码提供依据。方法 利用记录单单位和多单位电位反应的方法，分别描记１７只猫听觉下丘核团对耳蜗内单极电刺激，耳蜗内双极电刺激和纯音刺激反应的空间调谐曲线。结果 耳蜗内双极电刺激能兴奋下丘中的特定区域，类似于纯音刺激的反应；而耳蜗内单极电刺激使下丘细胞广泛地被兴奋，不能提供部位代码。

Spatial tuning curve recording in inferior colliculus during electrical stimulation of the cochlea]

OBJECTIVE: To explore the electrical activity mechanism of auditory center to intracochlear electrical stimulation and provide physiological foundation for spatial encoding of electrical stimulation in multiple channel cochlear implant. METHODS: The spatial tuning curves(STC) in the inferior colliculus(IC) to monopolar electrical stimulation, bipolar electrical stimulation and tone stimulation in cats were composed by using the single unit and the multi-units cluster recording method. RESULTS: The bipolar electrical stimulation excited the response in the specific region in IC, which was similar to the response induced by tone stimulation. The monopolar electrical stimulation excited an extensive response and could not provide the spatial encoding. CONCLUSION: Using the bipolar electrical stimulation, the stimulation region is the key point for improving the spatial encoding. The physiological results of spatial encoding of monopolar electrical stimulation contradicted the psychophysical conclusion and the clinical effect of CI patients. The explanation to this needs further studies.