Synaptic plasticity: Going through phases with LTP Emily P Huang  Current Biology  Volume 8, Issue 10, Pages R350-R352 (May 1998) DOI: 10.1016/S0960-9822(98)70219-2

Figure 1 Early and late phases of long-term potentiation (LTP). A train of repetitive stimuli (arrows) induces an increase in synaptic strength known as LTP. A single train of stimuli induces E-LTP (red), which decays over the course of a few hours. Multiple trains also induce L-LTP (blue), which remains stable for many hours. Current Biology 1998 8, R350-R352DOI: (10.1016/S0960-9822(98)70219-2)