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Macroelectrode and microelectrode array used in this study. (A) Pictures of microelectrode array (MEA) and macroelectrode of the type that were used in this study. Each of the 16 electrodes of the MEA measure 33 μm in diameter and the macroelectrode measures 150 μm. (B) The approximate implantation positions of the MEA and the macroelectrode in the rodent dorsal hippocampus.
