Temporal Integration or Temporal summation: When Presynaptic of another individual neuron initiate multiple fires over a period of time, the total charger collected together may have enough potential to exceed the threshold of the postsynaptic of another connected neuron is called Temporal Summation or Integral.
Action Potential frequency is directly proportional to the Threshold, means higher the frequency of fire, the more quickly exceeded the threshold.
For example, Presyanptics of neuron A individually fires an insufficient charge at a time, but when it fires continually, all the charges are summed or integrated together then it may exceed the threshold and cause an action potential on neuron X.
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