Neurons direct the excitement from the receptors towards the organs of success. The astrocytes are not directly involved. These act on and between the neurons. An astrocyte feeds multiple neurons and one neuron is supplied by multiple astrocytes. Thus, the astrocytes register consuming (in the brain outnumber the astrocytes) the energy demand for the neurons involved in the pathways. If one neuron consumes a lot, the other neurons supplied have less. These facts can not explain the previous theses on the function of astrocytes. From the known facts follows, synapses (and thus the course of the excitations) are changed by the astrocytes and not by neuron control loops. The following in German in more detail.

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Stefan Pschera
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