.. currentmodule:: brian

.. index::
   pair: example usage; NeuronGroup
   pair: example usage; run
   pair: example usage; PopulationRateMonitor
   pair: example usage; raster_plot
   pair: example usage; Connection
   pair: example usage; SpikeMonitor
   pair: example usage; STP

.. _example-plasticity_short_term_plasticity2:

Example: short_term_plasticity2 (plasticity)
============================================

Network (CUBA) with short-term synaptic plasticity for excitatory synapses
(Depressing at long timescales, facilitating at short timescales)

::

    from brian import *
    from time import time
    
    eqs = '''
    dv/dt = (ge+gi-(v+49*mV))/(20*ms) : volt
    dge/dt = -ge/(5*ms) : volt
    dgi/dt = -gi/(10*ms) : volt
    '''
    
    P = NeuronGroup(4000, model=eqs, threshold= -50 * mV, reset= -60 * mV)
    P.v = -60 * mV + rand(4000) * 10 * mV
    Pe = P.subgroup(3200)
    Pi = P.subgroup(800)
    Ce = Connection(Pe, P, 'ge', weight=1.62 * mV, sparseness=.02)
    Ci = Connection(Pi, P, 'gi', weight= -9 * mV, sparseness=.02)
    stp = STP(Ce, taud=200 * ms, tauf=20 * ms, U=.2)
    M = SpikeMonitor(P)
    rate = PopulationRateMonitor(P)
    t1 = time()
    run(1 * second)
    t2 = time()
    print "Simulation time:", t2 - t1, "s"
    print M.nspikes, "spikes"
    subplot(211)
    raster_plot(M)
    subplot(212)
    plot(rate.times / ms, rate.smooth_rate(5 * ms))
    show()