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Effects of different filter designs and phase correction of an extracellularly recorded electrophysiological signal. A, The effects of high (blue, cutoff frequency: 4 Hz), low (green, cutoff frequency: 20 Hz), and band (cyan, pass-band: 4–20 Hz) pass four-poles Butterworth filters on an extracellular signal recorded from a rat striatum (black). B, Phase correction (red) by refiltering of the reversed filtered (i) high-pass and (ii) low-pass signals using similar filter designs.
