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The brain, in turn, sends control signals back to the cochlea, much as it sends signals to the eyes to focus them on items of interest. However, this aspect of the brain/cochlea interaction is poorly understood compared to the signal processing done by the cochlea itself.

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Layout is not related to the design per se, but we mention it here anyway. The process of working with this and other chips has led to an appreciation of the special design rules that must be used with subthreshold technology.