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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Ear Hear. 2018 Nov-Dec;39(6):1136–1145. doi: 10.1097/AUD.0000000000000566

Figure 1.

Figure 1

A) Two cochlear implant channels are represented by rectangles, spiral ganglion neurons by grey ovals, and the edge of the osseous spiral lamina by a dashed line. The spatial extent of currents required to activate neurons for each channel are indicated by the shaded areas. Partial tripolar with a fixed focused configuration is shown on the left (TP); the σ focusing coefficient was fixed at 0.8. The middle drawings show the monopolar configuration (MP); σ was fixed at 0. The new dynamically focused configuration is shown on the right. This new mode stimulates with a highly focused configuration for threshold inputs (σ = 0.8) and a broader configuration for input levels near most comfortable listening (σ = 0.5). B) Two examples of the rate of change of the focusing coefficient as a function of the input stimulus level for a 60-dB input dynamic range (Litvak et al., 2007). The left panel shows an example channel with a large electrical dynamic range while the right panel shows a channel with a small electrical dynamic range.