www.neuron.yale.edu

OK.I can understand that it is due to numeric overflow problems for mechanisms that involve exponential functions of membrane potential. But why does NEURON show segmentation fault when I inject a high value of current. /usr/local//i386/bin/nrniv: Segmentation violation in init.hoc near line 71 run(...

Hi, In my model I want to inject a current of 40000 nA (0.04 mA) for 0.05 ms. I am delivering it as a single stimulus (using IClamp) or as a stimulus train (using the method which is given as answer to the following question in FAQ section "I just want a current clamp that will deliver a sequen...

I installed the recent alpha version and it works fine. Thank you for your help.

OK. I will execute it with recent NEURON version. Thank you Hines.

All the above things which I mentioned happens only when I decalare vgap as RANGE variable in gap.mod(This is gap junction mechanism adopted in NEURON book chapter 10.1.2). But when I change vgap to pointer variable as it is given in the NEURON book, it throws up a segmentation fault at stdinit. Wha...

Let me explain the context of this error. I am working with pc.source_var and pc.target_var for the purpose of making gap junctions working in mpi environment. I added lines of code incrementally and compiled them. Till the point I insert the statement pc.setup_transfer() everything is fine (Model c...

I am getting this timeout error when I run my model. nrn_timeout t=3 -------------------------------------------------------------------------- MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD with errorcode 0. NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes. You may...

Also, How does NET_RECEIVE differentiates event from different streams. I am asking this because in the documentation I read "We resolve this ambiguity by choosing concatenation, so that repetitive impulses on one stream produce a saturating conductance change (Fig. 10.10). However, conductance...

I understand that the example which i mentioned doesn't summate inputs from more than one stream. But when another input event arrives while the synapse is on, it doesn't extend the period of transmitter in the cleft. Comparing with your saturating synapse model in NEURON book, there is nothing like...

NB I haven't tried any of this. Let me know how it goes.

Yes i will post it here when I m done.. Thanks..

I am trying to create a network of Izhikevich neurons (http://senselab.med.yale.edu/modeldb/showmodel.asp?model=39948&file=\izh\izh.mod) connected by Gap junctions. The neuron's voltage is vv which is quite different from the soma's voltage v in which it is inserted. But gap junctions just calcu...

I am using the gap junction version that is mentioned in NEURON book(chapter 10). In that piece of code(gap.mod), even if i change the units of resistance r there is no impact on the result. For example if I change the units of r to ohm or gigaohm or leave it dimensionless it neither produces error ...

But the current is too small even after doing post processing(scaling).
Its something around 10 to the power of -13 nA.
Thats way too small.
Any comments?

I have a network of cells connected by gap junctions and GABA synapses.. I need to record the total membrane current of each cell and analyse them. Is extracellular mechanism a way to do this ? If so, will it alter the cell's behaviour ? What should be the value of the parameters in extracellular me...

Its Synapse.mod. I am pasting the link below.

https://senselab.med.yale.edu/modeldb/S ... ynapse.mod


Shyam