STDP
Spike timing dependant plasticity is a biological process that adjusts the strength of connections between neurons in the brain. The process adjusts the connection strengths based on the relative timing of a particular neuron's output and input action potentials (or spikes). The STDP process partially explains the activity-dependent development of nervous systems, especially with regard to long-term potentiation and long-term depression.
Here we can see that postsynaptinc firing after the presynaptic increases the synaptic weight.
and vice versa
