Dear All,
One of the interesting points of TsodyksMarkram model is the possibility to include facilitation,
This way three states are defined
x=> fraction of available synaptic resources but not active
y=> fraction or active synaptic resources
z=> fraction of inactive resources.
Such that
y converts to z with time constant t1, and z converts back to x with time constant trec
I want to study the nonfacilitated problem and for that
I assume new y0 = y0 + x instead of new y0 = y0 + x · u with u the facilitation term. this because It results a very good and more realistic approach to study of the GABAA dynamics. than just one monoexponential.
However, since this is a multistate approach the total time of activation should be comparable with the tau in the monoexponential case for the limit case, but I can not figure out how to set conditions for that limit case:
Should I assume that trec dominates the dynamics of the channel? or is it somehow a combination between t1 and trec?
Thanks a lot for any feedback!!
Best,
OJAG
Dominant Tau inTsodyksMarkram synapse model..?
Moderator: tom_morse

 Site Admin
 Posts: 5334
 Joined: Wed May 18, 2005 4:50 pm
 Location: Yale University School of Medicine
 Contact:
Re: Dominant Tau inTsodyksMarkram synapse model..?
If you are using my implementation of that mechanism, all that is necessary is to set tau_facil to 0. Then the constant parameter U controls the fraction of x ("available transmitter") that is "released." If you want all of it to be released, just set U to 1.OJAG wrote:I want to study the nonfacilitated problem and for that
I assume new y0 = y0 + x instead of new y0 = y0 + x · u with u the facilitation term.
The synaptic conductance decays with a single time constant: tau_1. tau_rec merely governs the rate at which the amount of "available transmitter" is restored.Should I assume that trec dominates the dynamics of the channel? or is it somehow a combination between t1 and trec?