Fig. 4

Schematic representation of astrocytic (purple) and neuronal (yellow) metabolism at rest (a, left) and upon stimulation (b, right). Only astrocytes accumulate glucose (green) at rest, whereas upon stimulation, energetic reserves are degraded in order to provide energy substrates (lactate, orange) to neurons. Astrocytes in exchange reuptake exceeding glutamate at the synaptic cleft level (not shown). For details see ref. [42]