Table 1.

Weight- and spike-timing-dependence of pair-based STDP models: additive, multiplicative, Gütig, van Rossum, and power law model.

Model name	F+(w)	F−(w)	x(Δt)
Additive (Song et al., 2000)	λ	−λα
Multiplicative (Turrigiano et al., 1998)	λ(1 − w)	−λαw
Gütig (Gütig et al., 2003)	λ(1 − w)μ	−λαwμ	$exp\left(-\frac{\left|\Delta t\right|}{{\tau }_{\text{STDP}}}\right)$
van Rossum (van Rossum et al., 2000)	cp	−cdw
Power law (Morrison et al., 2007)	λwμ	−λαw

F₊ in case of a causal spike-timing-dependence (Δt > 0) and F₋ in the anti-causal case (Δt < 0). Throughout this study, the model proposed by Gütig et al. is applied with parameters α = 1.05, λ = 0.005, μ = 0.04, and τ_STDP = 20 ms in accordance with Song et al. (2000), van Rossum et al. (2000), Rubin et al. (2001), Gütig et al. (2003), Morrison et al. (2008).