STDP

STDP(
    tau_plus=20.0,
    tau_minus=20.0,
    A_plus=0.01,
    A_minus=0.01,
    w_min=0.0,
    w_max=1.0,
)

Spike-timing dependent plasticity, online version.

Song, S., and Abbott, L.F. (2001). Cortical development and remapping through spike timing-dependent plasticity. Neuron 32, 339-350.

Equivalent code:

STDP = ann.Synapse(
    parameters = dict(
        tau_plus = 20.0,
        tau_minus = 20.0,
        A_plus = 0.01,
        A_minus = 0.01,
        w_min = 0.0,
        w_max = 1.0,
    ),
    equations = [
        ann.Variable('tau_plus  * dx/dt = -x', method='event-driven'),
        ann.Variable('tau_minus * dy/dt = -y', method='event-driven'),
    ],
    pre_spike="""
        g_target += w
        x += A_plus * w_max
        w = clip(w + y, w_min , w_max)
    """,
    post_spike="""
        y -= A_minus * w_max
        w = clip(w + x, w_min , w_max)
    """
)

Parameters

Name	Description	Default
tau_plus	time constant of the pre-synaptic trace (ms)	`20.0`
tau_minus	time constant of the pre-synaptic trace (ms)	`20.0`
A_plus	increase of the pre-synaptic trace after a spike.	`0.01`
A_minus	decrease of the post-synaptic trace after a spike.	`0.01`
w_min	minimal value of the weight w.	`0.0`
w_max	maximal value of the weight w.	`1.0`