What are generally designed to have a very high value of input impedance to take care of high electrode impedance?

What are generally designed to have a very high value of input impedance to take care of high electrode impedance? Correct Answer Preamplifiers

Good electrode impedance should be generally below 5 kilohms. Impedance between a pair of electrodes must also be balanced or the difference between them should be less than 2 kilohms. EEG preamplifiers are generally designed to have a very high value of input impedance to take care of high electrode impedance.
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