STP
self, tau_rec=100.0, tau_facil=0.01, U=0.5) STP(
Synapse exhibiting short-term facilitation and depression.
Implemented using the model of Tsodyks, Markram et al.:
Tsodyks, Uziel and Markram (2000) Synchrony Generation in Recurrent Networks with Frequency-Dependent Synapses. Journal of Neuroscience 20:RC50
Note that the time constant of the post-synaptic current is set in the neuron model, not here.
Equivalent code:
= ann.Synapse(
STP = dict(
parameters = 100.0,
tau_rec = 0.01,
tau_facil = 0.5,
U
),= [
equations 'dx/dt = (1 - x)/tau_rec', init = 1.0, method='event-driven'),
ann.Variable('du/dt = (U - u)/tau_facil', init = 0.5, method='event-driven'),
ann.Variable(
],="""
pre_spike g_target += w * u * x
x *= (1 - u)
u += U * (1 - u)
"""
)
Parameters
Name | Type | Description | Default |
---|---|---|---|
tau_rec | depression time constant (ms). | 100.0 |
|
tau_facil | facilitation time constant (ms). | 0.01 |
|
U | use parameter. | 0.5 |