# Command: quantal_stp_synapse

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Name:

    quantal_stp_synapse - Probabilistic synapse model with short term
      plasticity.

Description:

      This synapse model implements synaptic short-term depression and
      short-term facilitation according to the quantal release model
      described by Fuhrmann et al. [1] and Loebel et al. [2].

      Each presynaptic spike will stochastically activate a fraction of
      the available release sites.  This fraction is binomialy
      distributed and the release probability per site is governed by the
      Fuhrmann et al. (2002) model. The solution of the differential
      equations is taken from Maass and Markram 2002 [3].

      The connection weight is interpreted as the maximal weight that can
      be obtained if all n release sites are activated.

Parameters:

      The following parameters can be set in the status dictionary:
      U	 double	- Maximal fraction of available resources [0,1],
      default=0.5
      u	 double	- available fraction of resources [0,1], default=0.5
      p	 double	- probability that a vesicle is available, default = 1.0
      n	 long  	- total number of release sites, default = 1
      a	 long  	- number of available release sites, default = n
      tau_rec   double	- time constant for depression in ms, default=800 ms
      tau_rec   double	- time constant for facilitation in ms, default=0 (off)

Transmits:

    SpikeEvent

References:

      [1] Fuhrmann, G., Segev, I., Markram, H., & Tsodyks, M. V. (2002). Coding of
      temporal information by activity-dependent synapses. Journal of
      neurophysiology, 87(1), 140-8.
      [2] Loebel, A., Silberberg, G., Helbig, D., Markram, H., Tsodyks,
      M. V, & Richardson, M. J. E. (2009). Multiquantal release underlies
      the distribution of synaptic efficacies in the neocortex. Frontiers
      in computational neuroscience, 3(November), 27.
      doi:10.3389/neuro.10.027.2009
      [3] Maass, W., & Markram, H. (2002). Synapses as dynamic memory buffers.
      Neural networks, 15(2), 155-61.

Author:

    Marc-Oliver Gewaltig, based on tsodyks2_synapse

FirstVersion:

    December 2013

SeeAlso:

- tsodyks2_synapse
- synapsedict
- stdp_synapse
- static_synapse

Source:

    /opt/conda/conda-bld/nest_1512418773968/work/nest-2.14.0/models/quantal_stp_connection.h

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