Robust modulation of integrate-and-fire models (Van Pottelbergh et al 2018)

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Accession:235138
"By controlling the state of neuronal populations, neuromodulators ultimately affect behavior. A key neuromodulation mechanism is the alteration of neuronal excitability via the modulation of ion channel expression. This type of neuromodulation is normally studied with conductance-based models, but those models are computationally challenging for large-scale network simulations needed in population studies. This article studies the modulation properties of the multiquadratic integrate-and-fire model, a generalization of the classical quadratic integrate-and-fire model. The model is shown to combine the computational economy of integrate-and-fire modeling and the physiological interpretability of conductance-based modeling. It is therefore a good candidate for affordable computational studies of neuromodulation in large networks."
Reference:
1 . Van Pottelbergh T, Drion G, Sepulchre R (2018) Robust Modulation of Integrate-and-Fire Models. Neural Comput 30:987-1011 [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell;
Brain Region(s)/Organism:
Cell Type(s): Abstract Izhikevich neuron; Abstract integrate-and-fire adaptive exponential (AdEx) neuron; Abstract integrate-and-fire neuron;
Channel(s):
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s):
Simulation Environment: Brian; Brian 2;
Model Concept(s): Bifurcation; Bursting; Action Potential Initiation; Delay; Multiscale; Neuromodulation;
Implementer(s): Van Pottelbergh, Tomas [tmjv2 at cam.ac.uk];
import matplotlib.pyplot as plt
import numpy as np
from brian2 import *
from brian_models import *

start_scope()

# False: Figure 6B
# True: Figure 6C
latency = True

v_th = 30
a = 0.02
b = 0.
if latency:
    c = -62
    d = 0.
else:
    c = -65
    d = 6

t_step = 1000
Izhikevich_eqs = Izhikevich_eqs + '''I = 16. + .255*sign(t/ms-t_step) : 1'''

G = NeuronGroup(1, Izhikevich_eqs, threshold = Izhikevich_threshold, reset = Izhikevich_reset, dt=0.5*ms, method='rk4')
M = StateMonitor(G, ['v','I'], record=0)

spikemon = SpikeMonitor(G)

run(2000*ms)

t = M.t/ms
V = M[0].v
V = (V-min(V))/(max(V)-min(V))*100.
I = M[0].I
I = 105.+(I-min(I))/(max(I)-min(I))*10.

# Draw spikes
for ti in spikemon.t:
    i = int(ti / G.dt)
    V[i] = 100.

# Plot
plt.figure()
plt.plot(t, V, t, I)
plt.show()

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