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--></style></head><body lang=IT link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi, i’m a student of university of Catania (Italy) and i’m using nengo 2.0</p><p class=MsoNormal>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. </p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>What is the reason for which we put as input a constant value of zero (nengo.Node(0)) ?</p><p class=MsoNormal>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?</p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>There is a way to change the initial condition of equation model?</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The code i used is this:</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>import nengo</p><p class=MsoNormal>from nengo.utils.functions import piecewise</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>model = nengo.Network()</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>with model:</p><p class=MsoNormal> u = nengo.Node(0)</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> e = nengo.Ensemble(n_neurons=1, dimensions=1,</p><p class=MsoNormal> neuron_type=nengo.Izhikevich(</p><p class=MsoNormal> tau_recovery=0.02,</p><p class=MsoNormal> coupling=0.2,</p><p class=MsoNormal> reset_voltage=-55,</p><p class=MsoNormal> reset_recovery=4))</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> nengo.Connection(u, e)</p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'>thanks a lot!<o:p></o:p></span></p></div></body></html>