Search results
Temporal summation. Temporal summation occurs when a high frequency of action potentials in the presynaptic neuron elicits postsynaptic potentials that summate with each other. The duration of a postsynaptic potential is longer than the interval between incoming action potentials.
Temporal summation is the addition of quickly occurring stimuli at a single synapse that is active repeatedly. A common EPSP lasts about 20 ms. Even so, with maximum stimulation, action potentials can reach axon terminals every millisecond.
The more closely postsynaptic potentials are spaced in time, the larger the eventual sum when they are added together. This concept is called temporal summation. Many small EPSPs all arriving at a decision point at the same time will be likely to result in a superthreshold stimulus.
Temporal summation for vibratory stimuli parallels the findings with spatial stimuli; that is, temporal summation is evident with stimulus conditions that favor stimulating Pacinian corpuscles. Higher temporal frequencies and larger contact surfaces yield the greatest amount of temporal summation.
In human eye: Temporal summation. In temporal summation, two stimuli, each being too weak to excite, cause a sensation of light if presented in rapid succession on the same spot of the retina; thus, over a certain range of times, up to 0.1 second, the Bunsen-Roscoe law holds:… Read More
Oct 31, 2023 · Temporal summation means that the effects of impulses received at the same place can add up if the impulses are received in close temporal succession. Thus, the neuron may fire when multiple impulses are received, even if each impulse on its own would not be sufficient to cause firing.
Temporary changes to the cell membrane voltage can result from neurons receiving information from the environment, or from the action of one neuron on another. These special types of potentials influence a neuron and determine whether an action potential will occur or not. Many of these transient signals originate at the synapse. Graded Potentials.
