stdp_synapse – Synapse type for spike-timing dependent plasticity
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Description
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``stdp_synapse`` is a connector to create synapses with spike time
dependent plasticity (as defined in [1]_). Here the weight dependence
exponent can be set separately for potentiation and depression.

.. warning::

   This synaptic plasticity rule does not take
   :ref:`precise spike timing <sim_precise_spike_times>` into
   account. When calculating the weight update, the precise spike time part
   of the timestamp is ignored.

See also [2]_, [3]_, [4]_.

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

Transmits
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SpikeEvent

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
.. [2] Rubin J, Lee D, Sompolinsky H (2001). Equilibrium
       properties of temporally asymmetric Hebbian plasticity. Physical Review
       Letters, 86:364-367. DOI: https://doi.org/10.1103/PhysRevLett.86.364
.. [3] Song S, Miller KD, Abbott LF (2000). Competitive Hebbian learning
       through spike-timing-dependent synaptic plasticity. Nature Neuroscience
       3(9):919-926.
       DOI: https://doi.org/10.1038/78829
.. [4] van Rossum MCW, Bi G-Q, Turrigiano GG (2000). Stable Hebbian learning
       from spike timing-dependent plasticity. Journal of Neuroscience,
       20(23):8812-8821.
       DOI: https://doi.org/10.1523/JNEUROSCI.20-23-08812.2000

See also
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:doc:`Synapse <index_synapse>`, :doc:`Spike-Timing-Dependent Plasticity <index_spike-timing-dependent plasticity>`