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Does impedance matter?

Somehow this question won't go away. To help resolve whether the impedance of an electrode matters for recording neural activity with a modern polytrode, we collected a dataset in which neighboring electrodes within a dense array had a 10-fold difference in impedance. These recordings allow direct comparison of the same neural signal measured with a low and high impedance electrode.

The dataset, as well as basic analysis scripts, can be downloaded here:

Polytrode impedance datasets