Search found 8 matches

by AndiL
Sun Nov 29, 2009 11:51 am
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Re: Extracellular Stimulation (2d)

i already tried to but the sinus-curve in the xtra.mod File. I changed the line: ex = is*rx*(1e6) to: ex = is*rx*(1e6)*sin(2*3.141*t*20000 so just adding the "*sin()" part. 20.000 is the frequency (and 2*PI*t for really creating a sinus) the output shows a sinus-function. (so far so good) But i want...
by AndiL
Fri Nov 27, 2009 7:27 am
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Re: Extracellular Stimulation (2d)

actually what i want to do is: to set an AC on the bipolar electrode(s). did you ever try a set like that?i mean if the bipolar set in the calcrxc.hoc works - the only thing i need to do is to set the STIM in an AC one, right? Yep, that's all you have to do. is there a elegant why to generate this ...
by AndiL
Thu Nov 26, 2009 4:15 am
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Re: Extracellular Stimulation (2d)

hey ted! ModelC does the same. What's ModelC? ModelC is a kind of predecessor of MRG (McIntyre). it already worked with the double cable as well but didnt divide the internodal compartments as McIntyre did. so it didnt really match the afterpotentials - but had a way better computation-time. thanks ...
by AndiL
Sun Nov 15, 2009 1:12 pm
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Re: Extracellular Stimulation (2d)

1) if i want to change the eletrical properties of the substance in which is surrounding the fiber it should be enough to change the values of extracellular, right? What electrical properties of the conductive medium do you want to change, and which "values of extracellular" do you propose to chang...
by AndiL
Sun Nov 15, 2009 12:02 pm
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Re: Extracellular Stimulation (2d)

Im using the Code as ChrisR posted it... i think it works out for me (changed the models from McNeil in ModelA, B and C described by Richardson as predecessor of the MRG Modell) However i have a couple of questions: 1) if i want to change the eletrical properties of the substance in which is surroun...
by AndiL
Mon Oct 26, 2009 4:17 pm
Forum: Other questions
Topic: Extracellular Stimulation (2d)
Replies: 39
Views: 20900

Extracellular Stimulation (2d)

Hey Guys! Im writing on my thesis and need a chapter about extracellular stimulation in neuron i read some papers about that topic, all the forum-threads and looked into the examples provided (extracellular_stim_and_rec and ecstim). the problem is that i think i just dont get it right - still... let...
by AndiL
Mon Oct 12, 2009 5:35 am
Forum: ModelDB and other online sources of models
Topic: Looking for Model
Replies: 1
Views: 11869

Looking for Model

Hey Everybody! I was looking for a Model (or actually 3) which are described to be used in the following paper: AG Richardson et al. Modelling the Effects of Electric Fields on Nerve Fibres: Influence of the Myelin Sheath, MBEC, 38 (4), 2000, 438-446. i was looking for them on the internet now the w...
by AndiL
Sat Apr 26, 2008 4:44 am
Forum: Other questions
Topic: Accessing / SumUp I_CAP and I_MEMBRANE
Replies: 1
Views: 1676

Accessing / SumUp I_CAP and I_MEMBRANE

Hi. Can i access variables stepwise (and sum them) when i dont have explicit access to the .mod files? My problem is, that i want to sum up i_cap and i_membrane. What i really need is, the integral of the two currents. (but the sum will do anyway) So in one of my models i just added another variable...