temporal summation

In physiology, temporal summation refers to the additive effect of successive stimuli on a single nerve or synapse. Individually, these stimuli may be too weak to trigger a response, but when they occur in rapid succession, their combined effect can generate a response.1

This phenomenon is observed in both nerve cells and sensory systems. For instance, in the human eye, two weak light stimuli, if presented in quick succession, can lead to the sensation of light even if each stimulus alone is insufficient. This is consistent with the Bunsen-Roscoe law, which states that the intensity of light multiplied by the time of exposure equals a constant within a certain time frame.2

Temporal summation is a crucial mechanism for integrating signals and ensuring that a sufficient stimulus threshold is reached for a response to occur.13