Search found 6 matches

by charlie
Wed Apr 14, 2010 7:07 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Re: Izhikevich Model: Connecting Two Cells

We have different dynamics for different types of connections to the cell. Excitatory and inhibitory connections have different time constants of activation and decay. We also have synaptic learning for each of the synaptic connections that differs depending on where the connection is coming from. W...
by charlie
Tue Apr 13, 2010 7:31 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Re: Izhikevich Model: Connecting Two Cells

Would it be possible to use a nonspecific_current to connect the izhi equation to the cell voltage. If the cell voltage equation has a leak conductance of zero and a capactiance of 1, with an area of 1, then the dV/dt equation would be exactly the izhikevich equation. In this way the izh.mod could j...
by charlie
Mon Apr 12, 2010 6:16 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Re: Izhikevich Model: Connecting Two Cells

One example is that we want to use both inhibitory connections and excitatory connections. If all other cells are connected to a single Izhi cell through multiple NetCon statements that all have our izhi cell as the target, how will the Izhi cell know in the Net_recieve code block if it should updat...
by charlie
Fri Apr 09, 2010 1:50 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Re: Izhikevich Model: Connecting Two Cells

Thank you we have been able to successfully connect two Izh cells. We are now interested in connecting multiple cells to one Izh cell. We are also interested in learning through synaptic plasticity for these connections. Is there anyway to have multiple separate synaptic connections from several cel...
by charlie
Mon Feb 15, 2010 6:06 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Re: Izhikevich Model: Connecting Two Cells

I noticed in your forum code post that you used a NetCon for izhikevich cells that simply put the izh object as the first argument for the postsynaptic cell without using &izh or referring to the izh.vv variable. When I set it up as: NetCon(izh,izh2,0,0,1) it connects izh as the presynaptic cell to ...
by charlie
Fri Feb 12, 2010 2:59 pm
Forum: Specific models
Topic: Izhikevich Model: Connecting Two Cells
Replies: 12
Views: 18734

Izhikevich Model: Connecting Two Cells

I am looking to connect two Izhikevich model cells with a synapse. I can already connect a NetStim input to an Izhikevich cell using NetCon, but I can't access the izh.vv variable to use an Izhikevich cell as the presynaptic cell. If I try to use the izh.vv variable as the first argument of a NetCon...