Fig. 2
A An actual top view image of the transparent electrode unit positioned on the rat cortex, B the five estimated sets of leads and electrode spots (#1–#5) on the glass electrode base, C electrocorticogram (ECoG) traces recorded by the five electrodes. The neural response in the somatosensory cortex (filled arrowhead) was evoked by an electrical pulse. The open arrowhead indicates spontaneous activity in the somatosensory cortex