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. 2010 May 24;3:16. doi: 10.1186/1756-6606-3-16

Figure 8.

Figure 8

Electrode positioning for ACC experiments. Four electrodes were implanted into the ACC. Differential recordings were performed between adjacent electrodes. Field potential voltage is most robust when straddling layers I-III of the ACC. The polarity of the recordings is opposite for the upper trace and lower trace since the electrode crosses the midline. The differences in polarity are most evident in NREM sleep. Bars indicate 200 μV calibration.