Effect of referencing on PSDs and slopes. (A) Mean PSDs (computed between 500 and
0 ms before stimulus onset; left plot) and the corresponding slopes (right plot)
calculated for the single-wire reference (red), average reference (green), bipolar
reference (blue), and CSD (orange) for monkeys 1 and 2. The number of electrodes
averaged is given in the inset in the first and third columns. (B) Mean PSDs (left
plot) and slopes (right plot) using bipolar reference where the reference electrode
was taken from varying distances from the recording electrode (distance ranges in m and the number of electrode pairs are
shown in the inset in the first and third columns). The insets in the first and third
columns show the PSDs between 0 and 100 Hz, the typical range used in most LFP
studies.
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