Spike is the main method of processing information in the neural system, but "neural coding" - the mechanism by which information in the form of spikes is processed and later interpreted remains unclear. In 1920, as part of the SNN theory, it was discovered that the firing of spikes from neurons increases with the intensity of the stimulus. This observation led to the extension of the rate coding hypothesis, according to which neurons communicate purely on the basis of the numbers and frequencies of these spikes. Recent research, however, has shown that the timing of individual spikes also plays an important role in this system. This latest observation supports the "temporal coding" hypothesis, where the precise timing of individual spikes is used to encode and transmit information.