.. currentmodule:: brian

.. index::
   pair: example usage; raster_plot
   pair: example usage; NeuronGroup
   pair: example usage; run
   pair: example usage; SpikeMonitor
   pair: example usage; StateMonitor

.. _example-misc_phase_locking:

Example: phase_locking (misc)
=============================

Phase locking of IF neurons to a periodic input

::

    from brian import *
    
    tau = 20 * ms
    N = 100
    b = 1.2 # constant current mean, the modulation varies
    f = 10 * Hz
    
    eqs = '''
    dv/dt=(-v+a*sin(2*pi*f*t)+b)/tau : 1
    a : 1
    '''
    
    neurons = NeuronGroup(N, model=eqs, threshold=1, reset=0)
    neurons.v = rand(N)
    neurons.a = linspace(.05, 0.75, N)
    S = SpikeMonitor(neurons)
    trace = StateMonitor(neurons, 'v', record=50)
    
    run(1000 * ms)
    subplot(211)
    raster_plot(S)
    subplot(212)
    plot(trace.times / ms, trace[50])
    show()