A single column thalamocortical network model (Traub et al 2005)

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To better understand population phenomena in thalamocortical neuronal ensembles, we have constructed a preliminary network model with 3,560 multicompartment neurons (containing soma, branching dendrites, and a portion of axon). Types of neurons included superficial pyramids (with regular spiking [RS] and fast rhythmic bursting [FRB] firing behaviors); RS spiny stellates; fast spiking (FS) interneurons, with basket-type and axoaxonic types of connectivity, and located in superficial and deep cortical layers; low threshold spiking (LTS) interneurons, that contacted principal cell dendrites; deep pyramids, that could have RS or intrinsic bursting (IB) firing behaviors, and endowed either with non-tufted apical dendrites or with long tufted apical dendrites; thalamocortical relay (TCR) cells; and nucleus reticularis (nRT) cells. To the extent possible, both electrophysiology and synaptic connectivity were based on published data, although many arbitrary choices were necessary.
1 . Traub RD, Contreras D, Cunningham MO, Murray H, LeBeau FE, Roopun A, Bibbig A, Wilent WB, Higley MJ, Whittington MA (2005) Single-column thalamocortical network model exhibiting gamma oscillations, sleep spindles, and epileptogenic bursts. J Neurophysiol 93:2194-232 [PubMed]
2 . Traub RD, Contreras D, Whittington MA (2005) Combined experimental/simulation studies of cellular and network mechanisms of epileptogenesis in vitro and in vivo. J Clin Neurophysiol 22:330-42 [PubMed]
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Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network;
Brain Region(s)/Organism: Neocortex; Thalamus;
Cell Type(s): Thalamus geniculate nucleus/lateral principal GLU cell; Thalamus reticular nucleus GABA cell; Neocortex U1 L6 pyramidal corticalthalamic GLU cell; Neocortex U1 L2/6 pyramidal intratelencephalic GLU cell; Neocortex fast spiking (FS) interneuron; Neocortex spiking regular (RS) neuron; Neocortex spiking low threshold (LTS) neuron;
Channel(s): I Na,p; I Na,t; I L high threshold; I T low threshold; I A; I K; I M; I h; I K,Ca; I Calcium; I A, slow;
Gap Junctions: Gap junctions;
Receptor(s): GabaA; AMPA; NMDA;
Simulation Environment: NEURON; FORTRAN;
Model Concept(s): Activity Patterns; Bursting; Temporal Pattern Generation; Oscillations; Simplified Models; Epilepsy; Sleep; Spindles;
Implementer(s): Traub, Roger D [rtraub at us.ibm.com];
Search NeuronDB for information about:  Thalamus geniculate nucleus/lateral principal GLU cell; Thalamus reticular nucleus GABA cell; Neocortex U1 L2/6 pyramidal intratelencephalic GLU cell; Neocortex U1 L6 pyramidal corticalthalamic GLU cell; GabaA; AMPA; NMDA; I Na,p; I Na,t; I L high threshold; I T low threshold; I A; I K; I M; I h; I K,Ca; I Calcium; I A, slow;
Files displayed below are from the implementation
dexptablebig_setup.f *
dexptablesmall_setup.f *
durand.f *
fnmda.f *
groucho_gapbld.f *
groucho_gapbld_mix.f *
synaptic_compmap_construct.f *
synaptic_map_construct.f *
            SUBROUTINE GROUCHO_gapbld (thisno, numcells, numgj,
     &       gjtable, allowedcomps, num_allowedcomps, display)
c       Construct a gap-junction network for groucho.f
c numcells = number of cells in population, e.g. number of tufted IB cells
c numgj = total number of gj to be formed in this population
c gjtable = table of gj's: each row is a gj.  Entries are: cell A,
c    compartment on cell A; cell B, compartment on cell B
c allowedcomps = a list of compartments where gj allowed to form
c num_allowedcomps = number of compartments in a cell on which a gj 
c    might form.
c display is an integer flag.  If display = 1, print gjtable

        INTEGER thisno, numcells, numgj, gjtable(numgj,4),
     &    num_allowedcomps, allowedcomps(num_allowedcomps)
        INTEGER i,j,k,l,m,n,o,p, ictr /0/
c ictr keeps track of how many gj have been "built"
        INTEGER display

        double precision seed, x(2), y(2)

            seed = 137.d0
            gjtable = 0
            ictr = 0
            k = 2

2           call durand (seed, k, x)
c This defines a candidate cell pair
            call durand (seed, k, y)
c This defines a candidate pair of compartments

           i = int ( x(1) * dble (numcells) )
           j = int ( x(2) * dble (numcells) )
           if (i.eq.0) i = 1
           if (i.gt.numcells) i = numcells
           if (j.eq.0) j = 1
           if (j.gt.numcells) j = numcells

c Is the unordered cell pair (i,j) in the list so far?
           if (ictr.eq.0) goto 1

           p = 0
         do L = 1, ictr
       if ((gjtable(L,1).eq.i).and.(gjtable(L,3).eq.j)) p = 1
       if ((gjtable(L,1).eq.j).and.(gjtable(L,3).eq.i)) p = 1
         end do

          if (p.eq.1) goto 2

c Proceed with construction
1          ictr = ictr + 1
           m = int ( y(1) * dble (num_allowedcomps) )
           n = int ( y(2) * dble (num_allowedcomps) )
         if (m.eq.0) m = 1
         if (m.gt.num_allowedcomps) m = num_allowedcomps
         if (n.eq.0) n = 1
         if (n.gt.num_allowedcomps) n = num_allowedcomps

         gjtable (ictr,1) = i
         gjtable (ictr,3) = j
         gjtable (ictr,2) = allowedcomps (m)
         gjtable (ictr,4) = allowedcomps (n)

            if (ictr.lt.numgj) goto 2

c Possibly print out gjtable when done.
       if ((display.eq.1).and.(thisno.eq.0)) then
        write (6,800)           
800     format(' GJTABLE ')
        do i = 1, numgj
         write (6,50) gjtable(i,1), gjtable(i,2),
     &                gjtable(i,3), gjtable(i,4)
50       FORMAT(4i6)
        end do