(physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce WordNet 3.0 & Open English WordNet

Summation, which includes both spatial summation and temporal summation, is the process that determines whether or not an action potential will be generated by the combined effects of excitatory and inhibitory signals, both from multiple simultaneous inputs, and from repeated inputs. Wikipedia

A way of achieving action potential in a neuron Wikipedia Disambiguation

Physiological integration of multiple synaptic potentials Wikidata