Abstract

The polarization impedance of a stainless steel bipolar electrode, which is used for chronic implants in laboratory rats, has been measured across the frequency spectrum from 200 Hz to 100 kHz. The polarization impedance has been measured in various solutions which are used for perfusion fixation, and it has also been measured in brain before and after fixation for electron microscopy. For the electrodes in brain, a significant amount of polarization impedance remained at 100 kHz, and prevented an accurate determination of tissue capacitance. However, tissue resistance was estimated by measuring impedance at several frequencies.

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