clopath_synapse – Synapse type for voltage-based STDP after Clopath
===================================================================

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

``clopath_synapse`` is a connector to create Clopath synapses as defined
in [1]_. In contrast to usual STDP, the change of the synaptic weight does
not only depend on the pre- and postsynaptic spike timing but also on the
postsynaptic membrane potential.

Clopath synapses require archiving of continuous quantities. Therefore Clopath
synapses can only be connected to neuron models that are capable of doing this
archiving. So far, compatible models are ``aeif_psc_delta_clopath`` and
``hh_psc_alpha_clopath``.

.. 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]_.

Parameters
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=======  ======  ==========================================================
tau_x    ms      Time constant of the trace of the presynaptic spike train
Wmax     real    Maximum allowed weight
Wmin     real    Minimum allowed weight
=======  ======  ==========================================================

Other parameters like the amplitudes for long-term potentiation (LTP) and
depression (LTD) are stored in the neuron models that are compatible with the
Clopath synapse.

Transmits
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SpikeEvent

References
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.. [1] Clopath et al. (2010). Connectivity reflects coding:
       a model of voltage-based STDP with homeostasis.
       Nature Neuroscience 13:3, 344--352. DOI: https://doi.org/10.1038/nn.2479
.. [2] Clopath and Gerstner (2010). Voltage and spike timing interact
       in STDP – a unified model. Frontiers in Synaptic Neuroscience 2:25.
       DOI: https://doi.org/10.3389/fnsyn.2010.00025
.. [3] Voltage-based STDP synapse (Clopath et al. 2010) on ModelDB
       https://modeldb.science/144566?tab=1

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

Examples using this model
+++++++++++++++++++++++++

.. listexamples:: iaf_psc_alpha