When Does Spatial Summation Occur?

Spatial summation is the effect of triggering an action potential in a neuron from one or more presynaptic neurons. This occurs when more than one excitatory postsynaptic potential (EPSP) originates simultaneously and a different part of the neurone.

Where does spatial summation occur?

Spatial summation occurs when subthreshold EPSPs, occurring simultaneously at different points along the postsynaptic membrane, combine to cause a depolarization that reaches the threshold of excitation.

What's spatial summation?

: sensory summation that involves stimulation of several spatially separated neurons at the same time.