.. currentmodule:: brian2

.. bipolar_with_inputs2:

Example: bipolar_with_inputs2
=============================


        .. only:: html

            .. |launchbinder| image:: http://mybinder.org/badge.svg
            .. _launchbinder: https://mybinder.org/v2/gh/brian-team/brian2-binder/master?filepath=examples/compartmental/bipolar_with_inputs2.ipynb

            .. note::
               You can launch an interactive, editable version of this
               example without installing any local files
               using the Binder service (although note that at some times this
               may be slow or fail to open): |launchbinder|_

        

A pseudo MSO neuron, with two dendrites (fake geometry).
There are synaptic inputs.

Second method.

::

    from brian2 import *
    
    # Morphology
    morpho = Soma(30*um)
    morpho.L = Cylinder(diameter=1*um, length=100*um, n=50)
    morpho.R = Cylinder(diameter=1*um, length=100*um, n=50)
    
    # Passive channels
    gL = 1e-4*siemens/cm**2
    EL = -70*mV
    Es = 0*mV
    taus = 1*ms
    eqs='''
    Im = gL*(EL-v) : amp/meter**2
    Is = gs*(Es-v) : amp (point current)
    dgs/dt = -gs/taus : siemens
    '''
    
    neuron = SpatialNeuron(morphology=morpho, model=eqs,
                           Cm=1*uF/cm**2, Ri=100*ohm*cm, method='exponential_euler')
    neuron.v = EL
    
    # Regular inputs
    stimulation = NeuronGroup(2, 'dx/dt = 300*Hz : 1', threshold='x>1', reset='x=0',
                              method='euler')
    stimulation.x = [0, 0.5] # Asynchronous
    
    # Synapses
    w = 20*nS
    S = Synapses(stimulation, neuron, on_pre='gs += w')
    S.connect(i=0, j=morpho.L[99.9*um])
    S.connect(i=1, j=morpho.R[99.9*um])
    
    # Monitors
    mon_soma = StateMonitor(neuron, 'v', record=[0])
    mon_L = StateMonitor(neuron.L, 'v', record=True)
    mon_R = StateMonitor(neuron, 'v', record=morpho.R[99.9*um])
    
    run(50*ms, report='text')
    
    subplot(211)
    plot(mon_L.t/ms, mon_soma[0].v/mV, 'k')
    plot(mon_L.t/ms, mon_L[morpho.L[99.9*um]].v/mV, 'r')
    plot(mon_L.t/ms, mon_R[morpho.R[99.9*um]].v/mV, 'b')
    ylabel('v (mV)')
    subplot(212)
    for i in [0, 5, 10, 15, 20, 25, 30, 35, 40, 45]:
        plot(mon_L.t/ms, mon_L.v[i, :]/mV)
    xlabel('Time (ms)')
    ylabel('v (mV)')
    show()
    

.. image:: ../resources/examples_images/compartmental.bipolar_with_inputs2.1.png