neither of which could be simply accounted for by electrical transmission. They concluded that “inhibitory synaptic action is mediated by a specific transmitter substance.” Valenstein is ...

Excitatory amino-acid transporters (EAATs ... neuronal membranes also rapidly bind released glutamate to shape synaptic transmission. In this Review, we summarize the properties of glutamate ...

This results in enough neurotransmitter being diffused across the synaptic cleft to trigger the impulse in the postsynaptic neuron. This process is called summation.