quantal_stp_synapse - Probabilistic synapse model with short term  

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.

The following parameters can be set in the status dictionary:
U double - Maximal fraction of available resources [0,1],
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)


[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.
[3] Maass, W., & Markram, H. (2002). Synapses as dynamic memory buffers.
Neural networks, 15(2), 155-61.

Marc-Oliver Gewaltig, based on tsodyks2_synapse  
December 2013  
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