Oscillations via Spike-Timing Dependent Plasticity in a Feed-Forward Model
Fig 2
The asymptotic synaptic weight in the case of single synapse STDP.
The different panels show the resultant synaptic weight profile w*(φ) given by eqs (12) and (13) as a function of the pre-post phase difference, φ, for different sets of parameters. A1-E1 (left column) show the results for the exponential STDP kernel, as in Fig 1C. A2-E2 (right column) show the results for the difference of Gaussians STDP kernel, as in Fig 1D. The different colors show the variation of the asymptotic weight with respect to a single parameter of the STDP-driven synaptic dynamics that is being varied. In A1 and A2 the different colors depict different values of μ. In B1 and B2 the different colors depict different values of the relative strength of depression α. In C1 and C2 the different colors are for different time constants of the STDP rule τ− and T, respectively. Panels D1 and D2 show the effect of the relative strength of the oscillatory activity Γr, see eq (8). Panels E1 and E2 show the effect of the oscillation frequency f. In all panels, unless stated otherwise in the legend the following parameters were used: α = 1, μ = 0.1, ν = 2π · 10Hz, and Γr = 0.5, for the exponential STDP kernel (left column) τ+ = τ− = 20ms was used, and for the Gaussian STDP kernel (right column) T± = 0 and τ+ = 20ms, τ− = 30ms were used.