[nengo-user] change current injection on Izhikevich neuron model

[Francesco Gallo Afflitto]

Hi, i’m a student of university of Catania (Italy) and i’m using nengo 2.0
Following tutorials, i built the model of Izhikevich, but i don’t undestand how to change the input J (the current injection) in the model. 
- What is the reason for which we put as input a constant value of zero (nengo.Node(0)) ?
I would change my input and insert for example a step like this (u = nengo.Node(piecewise({0:0.1,2:10}))). But if i make this change, the output is not a spiking neuron. Why? Because seem to not work well if the input is Greater than 0.3. What i’ve to change?
- There is a way to change the initial condition of equation model?

The code i used is this:

import nengo
from nengo.utils.functions import piecewise

model = nengo.Network()

with model:
    u = nengo.Node(0)


    e = nengo.Ensemble(n_neurons=1, dimensions=1,
                       neuron_type=nengo.Izhikevich(
                           tau_recovery=0.02,
                           coupling=0.2,
                           reset_voltage=-55,
                           reset_recovery=4))

    nengo.Connection(u, e)

thanks a lot!
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