Search found 5621 matches

by ted
Tue May 24, 2005 8:59 pm
Forum: Other questions
Topic: pseudorandom sequence used by ChannelBuilder
Replies: 0
Views: 2718

pseudorandom sequence used by ChannelBuilder

On 2/23/2005 Ted Carnevale wrote: Does the ChannelBuilder's "single channel" mode use MCellRan4 by default, or must this be specified somehow by the user? Does each ChannelBuilder instance have its own generator? On 2/23/2005 Michael Hines wrote: KSChan.rseed(value) is global for all the KSChan inst...
by ted
Tue May 24, 2005 8:55 pm
Forum: Other questions
Topic: Seed source for Random class
Replies: 0
Views: 2908

Seed source for Random class

On 2/23/2005 a NEURON user wrote: > What is the standard way in NEURON to generate a different series of > random numbers each execution - i.e., to define a different seed for the > Random() class at runtime (or at selected times during execution or > whatever)? One way would be to read some unpredi...
by ted
Tue May 24, 2005 8:50 pm
Forum: Other questions
Topic: How to batch_run with variable time step?
Replies: 0
Views: 2687

How to batch_run with variable time step?

On 2/23/2005 a NEURON user wrote: > Is there any way to use batch_run with a variable time step? On 2/23/2005 Michael Hines replied: if cvode is active it is the integrator for batch_run. However it still breaks at tstep step size intervals. A more direct integration that avoids fadvance is cvode.so...
by ted
Tue May 24, 2005 8:43 pm
Forum: Modeling networks
Topic: How to model a net that involves an inhibitory neuron
Replies: 0
Views: 3623

How to model a net that involves an inhibitory neuron

On 2/15/2005 a NEURON user wrote: > I'm looking for, ideally, a model of an inhibitory neuron that both functions on its own You may find some in ModelDB. Check out the link to ModelDB on NEURON's home page www.neuron.yale.edu. We try to ensure that all NEURON models in the database will run and pro...
by ted
Tue May 24, 2005 8:20 pm
Forum: Other questions
Topic: How to make a noisy IClamp
Replies: 0
Views: 2958

How to make a noisy IClamp

On 1/24/2005 a NEURON user wrote: > I am trying to nosify the injected current IClamp of NEURON. I could not > see any function able to do that. Do you know any? The best way is to use the Random class's play() method. See http://www.neuron.yale.edu/neuron/static/docs/help/neuron/general/classes/ran...
by ted
Tue May 24, 2005 8:12 pm
Forum: Other questions
Topic: Using the Random class to get independent random streams
Replies: 0
Views: 2741

Using the Random class to get independent random streams

On 1/21/2005 a NEURON user wrote: > I would like to use a "Point Process" mechanism for noise generation. I > wrote one which seemed to work corectly, until I wanted to have > uncorrelated noise on 2 cells. I got the same "NONSPECIFIC CURRENT" for > each cell although I set the random seed with the ...
by ted
Tue May 24, 2005 7:57 pm
Forum: Other questions
Topic: Simulating an epsc
Replies: 0
Views: 3973

Simulating an epsc

On 1/2/2005 a NEURON user wrote: > Please let me know the method to simulate an EPSC shaped current. Are you sure you want a "real" current source, i.e. infinite source impedance? NEURON's built-in AlphaSynapse produces a single conductance change that approximates the time course of a single synapt...
by ted
Mon May 23, 2005 11:26 am
Forum: OS X
Topic: OS X 10.4: warnings when running nrnivmodl
Replies: 0
Views: 3691

OS X 10.4: warnings when running nrnivmodl

On 5/23/2005 in reply to Arnd Roth <arnd.roth@ucl.ac.uk>, Michael Hines <michael.hines@yale.edu> wrote: > Neuron works fine for me on Mac OS X 10.4, including the compilation of .mod files, > but I'm getting some warning messages about multiple definitions of symbols: I'm glad to hear that. It could...
by ted
Sun May 22, 2005 8:46 pm
Forum: The GUI
Topic: can't reconstitute an Impedance Path tool from a ses file
Replies: 1
Views: 4467

can't reconstitute an Impedance Path tool from a ses file

I was examining the electrotonic properties of a model cell with the Impedance Path tool. My custom GUI consisted of a CellBuilder, a RunControl panel, and the Impedance Path tool. I saved this to a ses file using File / save session, then exited NEURON. Later I restarted NEURON and tried to recover...
by ted
Sun May 22, 2005 11:49 am
Forum: Modeling networks
Topic: Non-rectifying electrical synapses
Replies: 3
Views: 7283

On 3/24/2005 Ted Carnevale <ted.carnevale@yale.edu> wrote: A nonrectifying electrical synapse is basically an ohmic connection between two nonadjacent segments. You can implement this in one of two ways. The "classical" approach is to use a pair of point processes as described in ftp://ftp.neuron.ya...
by ted
Sun May 22, 2005 11:47 am
Forum: Modeling networks
Topic: Non-rectifying electrical synapses
Replies: 3
Views: 7283

Non-rectifying electrical synapses

On 3/24/2005 Ginny Cruz <gcruz@newssun.med.miami.edu> wrote: I've only recently started to learn Neuron and would like to create a (small circuit) model of neurons that are connected together, not by chemical synapses, but by non-rectifying electrical synapses. Moreover, these synapses are axo-axona...
by ted
Sun May 22, 2005 11:43 am
Forum: Optimization
Topic: Logging parameter and error values during optimization
Replies: 6
Views: 10682

On 3/21/2005 Michael Hines <michael.hines@yale.edu> wrote: The Optimize panel of the MulRunFitter has a checkbox for appending the path the fitter takes to "savepath.fit". However this is not every run but only the best result after each quadratic form. You can look at nrn/lib/hoc/mulfit/fitparm.hoc...
by ted
Sun May 22, 2005 11:41 am
Forum: Optimization
Topic: Logging parameter and error values during optimization
Replies: 6
Views: 10682

Logging parameter and error values during optimization

On 3/16/2005 Randy Powers <rkpowers@u.washington.edu> asked: 1. Is there any way to get the MultiRun fitter to save a log of the parameter and error values for all of the runs? 2. Does anyone have an example of a hoc file that uses multiple fitters to simultaneously fit voltage- and current-clamp da...
by ted
Sun May 22, 2005 11:35 am
Forum: Modeling networks
Topic: Inhibitory ring of with circulating waves of activity.
Replies: 2
Views: 3976

In retrospect, I see that a few additional comments are necessary. > It involved getting a three cell reciprocally connected integrate-and-fire model The connections in this net are not reciprocal. They are cyclical. That is, A inhibits B which inhibits C which inhibits A, and A B & C are all driven...
by ted
Sun May 22, 2005 11:19 am
Forum: Modeling networks
Topic: Inhibitory ring of with circulating waves of activity.
Replies: 2
Views: 3976

On 3/10/2005 Ted Carnevale <ted.carnevale@yale.edu> wrote: > At the Neuron training session at the University of Minnesota > several years ago, either yourself or your colleague showed > me an interesting demonstration using Neuron. It involved getting > a three cell reciprocally connected integrate...