Fig. 1

Cortical responses to bipolar and monopolar stimulations. ( A) Optical responses to bipolar (top line) and monopolar (bottom line) stimulations over time. Vessel maps obtained with green light were shown on the far left. Electrodes used were illustrated with solid (sources) or hollow (returns) arrows. Subtracted frames shown were obtained at 0.5 s, 1.0 s, 2.0 s, 3.0 s, from imaging onset, respectively. Electrical stimulations were conducted between 0.5 s and 1.0 s during imaging. Areas of the image having reflectance changes larger than 3 times the mean square deviation were labeled with red lines as areas with significant changes. A: anterior; L: lateral. (B) Super pixel time courses of bipolar and monopolar stimulations. The “near” courses were obtained from the red dots nearest to source electrodes indicated in (A) and the "distant" ones were obtained from the far-most dots in (A). (C) Peaking values of time courses as function of distance from the “near” dots to the “distant” dots indicated in (A)