Model's prediction and comparison to experimental results from hippocampal culture. A . The standard pairwise STDP curve is recovered by the model. Blue lines indicate the model's results and red circles the experimental data . B . Triplets, consisting of two pre- and one postsynaptic spike or vice versa, induce a non-linear change in synaptic strength. Blue bars represent the model's results, which follow closely the experimental results  presented with red boxes. In green, the linear addition of the contribution of the two composing pairs as from Panel A.