Figure 1.

A neuron receiving spike trains via two types of synapses showing short-term facilitation (red) or depression (green). Presynaptic populations are assumed to fire Poissonian spike trains, either at a background rate or an elevated rate, modulated by a signal s_F(t) (“F signal,” for the facilitating synapses) and s_D(t) (“D signal,” for the depressing synapses). We address the question of how the two independent signals are represented and how they interact in the output spike train.