stdp – Synapse type for spike-timing dependent plasticity
=========================================================

Description
+++++++++++

The STDP class is a type of synapse model used to create
synapses that enable spike timing dependent plasticity
(as defined in [1]_).
Here the weight dependence exponent can be set separately
for potentiation and depression.


Parameters
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========== =======  ======================================================
 tau_plus  ms       Time constant of STDP window, potentiation
 tau_minus ms       Time constant of STDP window, depression
 lambda    real     Step size
 alpha     real     Asymmetry parameter (scales depression increments as
                    alpha*lambda)
 mu_plus   real     Weight dependence exponent, potentiation
 mu_minus  real     Weight dependence exponent, depression
 Wmax      real     Maximum allowed weight
========== =======  ======================================================


References
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.. [1] Guetig et al. (2003). Learning input correlations through nonlinear
       temporally asymmetric hebbian plasticity. Journal of Neuroscience,
       23:3697-3714 DOI: https://doi.org/10.1523/JNEUROSCI.23-09-03697.2003