Fig. (1) Schematic illustrations of the multiprobe assembly (MPA) system. Left side: The localization of the various sensors on the cortex. Right side: Location of the MPA on the rat cranium. LDF - light guide connected to the laser Doppler flowmeter; NADH - light guide connected to the fluorometer/reflectometer for NADH fluorescence and 366 nm reflectance; EK - selective K⁺ electrode; DC - direct current electrode; KCl - push-pull cannula for CSD initiation; ECoG - bipolar ECoG electrodes. R - radii of the circumference of the embedded probes.