Interactive single Izhikevich neuron NeuroML example#

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#%pip install pyneuroml neuromllite NEURON
from neuroml import NeuroMLDocument
from neuroml import Izhikevich2007Cell
from neuroml import Population
from neuroml import Network
from neuroml import PulseGenerator
from neuroml import ExplicitInput
import neuroml.writers as writers
from neuroml.utils import validate_neuroml2
from pyneuroml import pynml
from pyneuroml.lems import LEMSSimulation
import numpy as np

Declaring the NeuroML model#

Create a NeuroML document#

nml_doc = NeuroMLDocument(id="IzhSingleNeuron")

Define the Izhikevich cell and add it to the model#

izh0 = Izhikevich2007Cell(
    id="izh2007RS0", v0="-60mV", C="100pF", k="0.7nS_per_mV", vr="-60mV",
    vt="-40mV", vpeak="35mV", a="0.03per_ms", b="-2nS", c="-50.0mV", d="100pA")

Create a network and add it to the model#

net = Network(id="IzhNet")

Create a population of defined cells and add it to the model#

size0 = 1
pop0 = Population(id="IzhPop0",, size=size0)

Define an external stimulus and add it to the model#

pg = PulseGenerator(
    id="pulseGen_%i" % 0, delay="0ms", duration="1000ms",
    amplitude="0.07 nA"
exp_input = ExplicitInput(target="%s[%i]" % (, 0),

Write the NeuroML model to a file#

nml_file = 'izhikevich2007_single_cell_network.nml'
writers.NeuroMLWriter.write(nml_doc, nml_file)
print("Written network file to: " + nml_file)
Written network file to: izhikevich2007_single_cell_network.nml

Validate the NeuroML model#

Validating izhikevich2007_single_cell_network.nml against /Users/padraig/anaconda/envs/py37/lib/python3.7/site-packages/libNeuroML-0.2.56-py3.7.egg/neuroml/nml/NeuroML_v2.2.xsd
It's valid!

Simulating the model#

Create a simulation instance of the model#

simulation_id = "example-single-izhikevich2007cell-sim"
simulation = LEMSSimulation(sim_id=simulation_id,
                            duration=1000, dt=0.1, simulation_seed=123)

Define the output file to store simulation outputs#

Here, we record the neuron’s membrane potential to the specified data file.

    "output0", "%s.v.dat" % simulation_id
simulation.add_column_to_output_file("output0", 'IzhPop0[0]', 'IzhPop0[0]/v')

Save the simulation to a file#

lems_simulation_file = simulation.save_to_file()
pyNeuroML >>> Written LEMS Simulation example-single-izhikevich2007cell-sim to file: LEMS_example-single-izhikevich2007cell-sim.xml

Run the simulation using the jNeuroML simulator#

    lems_simulation_file, max_memory="2G", nogui=True, plot=False

Plot the recorded data#

# Load the data from the file and plot the graph for the membrane potential
# using the pynml generate_plot utility function.
data_array = np.loadtxt("%s.v.dat" % simulation_id)
    [data_array[:, 0]], [data_array[:, 1]],
    "Membrane potential", show_plot_already=True,
    xaxis="time (s)", yaxis="membrane potential (V)"
pyNeuroML >>> Generating plot: Membrane potential
<AxesSubplot:xlabel='time (s)', ylabel='membrane potential (V)'>