Define temporal and spatial summation. Where does the summation occur? Are these processes mutually exclusive, or can they occur at the same time in a typical multipolar neuron? What key property of neurons do these forms of summation demonstrate?
What will be an ideal response?
Temporal summation is the addition of graded potentials that overlap in time;
that is, a second potential arrives before the first one from that source has finished. Spatial summation occurs when
there is simultaneous arrival of graded potentials originating from more than one synaptic input. Summation
occurs at the trigger zone. Typically a multipolar neuron has many active synapses at a given time, with multiple
potentials being produced at each. Summation demonstrates postsynaptic integration.
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