Command: quantal_stp_synapse



[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)


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] 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)

Marc-Oliver Gewaltig based on tsodyks2_synapse