tsodyks2_synapse - Synapse type with short term plasticity.
This synapse model implements synaptic short-term depression and short-term
facilitation according to [1] and [2]. It solves Eq (2) from [1] and
modulates U according to eq. (2) of [2].
This connection merely scales the synaptic weight, based on the spike history
and the parameters of the kinetic model. Thus, it is suitable for all types
of synaptic dynamics, that is current or conductance based.
The parameter A_se from the publications is represented by the
synaptic weight. The variable x in the synapse properties is the
factor that scales the synaptic weight.
The following parameters can be set in the status dictionary:
\verbatim embed:rst
======== ====== ========================================================
U real Maximum probability of release (U1) [0,1], default=0.5
u real Maximum probability of release (U_se) [0,1],
default=0.5
x real Current scaling factor of the weight, default=U
tau_fac ms Time constant for facilitation, default = 0(off)
tau_rec ms Time constant for depression, default = 800ms
======== ====== ========================================================
\endverbatim
SpikeEvent
Under identical conditions, the tsodyks2_synapse produces
slightly lower peak amplitudes than the tsodyks_synapse. However,
the qualitative behavior is identical. The script
test_tsodyks2_synapse.py in the examples compares the two synapse
models.
\verbatim embed:rst
.. [1] Tsodyks MV, Markram H (1997). The neural code between neocortical
pyramidal neurons depends on neurotransmitter release probability.
PNAS, 94(2):719-23.
DOI: https://doi.org/10.1073/pnas.94.2.719
.. [2] Fuhrman, G, Segev I, Markram H, Tsodyks MV (2002). Coding of
temporal information by activity-dependent synapses. Journal of
Neurophysiology, 87(1):140-8.
DOI: https://doi.org/10.1152/jn.00258.2001
.. [3] Maass W, Markram H (2002). Synapses as dynamic memory buffers.
Neural Networks, 15(2):155-61.
DOI: https://doi.org/10.1016/S0893-6080(01)00144-7
\endverbatim
Marc-Oliver Gewaltig, based on tsodyks_synapse by Moritz Helias
October 2011
/var/www/debian/nest/nest-simulator-2.18.0/models/tsodyks2_connection.h