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. 2010 Apr 22;6(4):e1000757. doi: 10.1371/journal.pcbi.1000757

Figure 1. Overview of plasticity rules used for ICA-like learning.

Figure 1

Synapse weights Inline graphic are modified by nearest-neighbor STDP and synaptic scaling. Additionally, intrinsic plasticity changes the neuron's transfer function by adjusting three parameters Inline graphic, Inline graphic, and Inline graphic. Different transfer functions show the effects of changing each of the three parameters individually relative to the default case depicted in blue. Namely, Inline graphic gives the slope of the curve, Inline graphic shifts the entire curve left or right, while Inline graphic can be used for rescaling the membrane potential axis. Here, Inline graphic is increased by a factor of 1.5, Inline graphic by Inline graphic, Inline graphic by a factor of Inline graphic.