% # iAMPA_PYdr_PYso_JB12: % % Normalized synaptic AMPAergic excitatory current, with synaptic % depression and minis, FROM the pyramidal axo-soma TO pyramidal dendrite % PYdr<-PYso connection used in the DynaSim implementation of (Benita et % al., 2012). % % - Dependencies: % - netconNearestNeighbors.m % % - References: % - Benita, J. M., Guillamon, A., Deco, G., & Sanchez-Vives, M. V. (2012). % Synaptic depression and slow oscillatory activity in a biophysical % network model of the cerebral cortex. Frontiers in Computational % Neuroscience, 6. https://doi.org/10.3389/fncom.2012.00064 % % - Tags: synapse, connection, excitation, ampa %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Parameters % For DynaSim, we need to convert synaptic maximal conductance from % absolute to area-relative terms, while also converting the units to % mS/cm^2 to keep pace with the rest of the equations: % % 5.4 nS (gAMPA EE) / 0.035 mm^2 (dendrite area) * ... % 1 mS / 1000000 nS * 100 mm^2 / 1 cm^2 = ... % 0.0154 mS/cm^2 % gAMPAMult = 1 % for experimenting with gAMPA gAMPA = gAMPAMult * 0.0154 % mS/cm^2 EAMPA = 0 % mV alpha = 3.48 tauS = 2 % ms deprFactor = 0.9 tauRes = 400 % ms sAMPAIC = 0.0 sAMPANoiseIC = 0.1 resIC = 0.8 resNoiseIC = 0.1 % Connectivity % Connective radius, aka how many target cells each source cell connects % to, from the source's perspective. radius = 10 % Remove autapses to the dendrite corresponding to this soma removeRecurrentBool = 1 % We also need to normalize the conductance in mS/cm^2 by the number of % connections each target cell is receiving on average, so that the TOTAL % sum of their conductive inputs adds to our overall maximal conductance % above. normalizingFactor = min(((2*radius + (1-removeRecurrentBool)) / (N_post/N_pre)), N_pre) % Note that what is passed is 2x the radius netcon = netconNearestNeighbors(2*radius, N_pre, N_post, removeRecurrentBool) % Functions IAMPA_PYdr_PYso_JB12(X,sAMPA,rec) = -gAMPA/normalizingFactor.*((res.*sAMPA)*netcon).*(X-EAMPA) monitor IAMPA_PYdr_PYso_JB12 % This is the synaptic activity state variable sAMPA' = alpha./(1 + exp(-(X_pre-20)./2)) - sAMPA./tauS sAMPA(0) = sAMPAIC+sAMPANoiseIC.*rand(1,N_pre) % This is the 'resources' state variable res' = (1 - res)./tauRes + max((t-tspike_pre)<=(2*dt)).*(-(1 - res)./tauRes + (deprFactor.*res - res)./dt) res(0) = resIC-resNoiseIC.*rand(1,N_pre) % Linker @current += IAMPA_PYdr_PYso_JB12(X_post,sAMPA,res)