Legend: Simultaneous measurement of regional cerebral blood flow (rCBF, A) using the H₂ clearance technique (Pt electrode) and tissue O₂ (B) using a carbon paste electrode in rat striatum in response to neuronal stimulation (5-min tail pinch). The effect of a 5-min tail pinch (TP) on brain extracellular glucose levels recorded in real time in the striatum of a freely moving rat using a microelectrochemical glucose biosensor (C).