# Example: gapjunctions

> 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):

Neurons with gap junctions.

    from brian2 import *

    n = 10
    v0 = 1.05
    tau = 10*ms

    eqs = '''
    dv/dt = (v0 - v + Igap) / tau : 1
    Igap : 1 # gap junction current
    '''

    neurons = NeuronGroup(n, eqs, threshold='v > 1', reset='v = 0',
                          method='exact')
    neurons.v = 'i * 1.0 / (n-1)'
    trace = StateMonitor(neurons, 'v', record=[0, 5])

    S = Synapses(neurons, neurons, '''
                 w : 1 # gap junction conductance
                 Igap_post = w * (v_pre - v_post) : 1 (summed)
                 ''')
    S.connect()
    S.w = .02

    run(500*ms)

    plot(trace.t/ms, trace[0].v)
    plot(trace.t/ms, trace[5].v)
    xlabel('Time (ms)')
    ylabel('v')
    show()