Synaptic scaling balances learning in a spiking model of neocortex (Rowan & Neymotin 2013)

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Learning in the brain requires complementary mechanisms: potentiation and activity-dependent homeostatic scaling. We introduce synaptic scaling to a biologically-realistic spiking model of neocortex which can learn changes in oscillatory rhythms using STDP, and show that scaling is necessary to balance both positive and negative changes in input from potentiation and atrophy. We discuss some of the issues that arise when considering synaptic scaling in such a model, and show that scaling regulates activity whilst allowing learning to remain unaltered.
1 . Rowan MS,Neymotin SA (2013) Synaptic Scaling Balances Learning in a Spiking Model of Neocortex Adaptive and Natural Computing Algorithms, Tomassini M, Antonioni A, Daolio F, Buesser P, ed. pp.20
Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network;
Brain Region(s)/Organism: Neocortex;
Cell Type(s): Neocortex V1 L6 pyramidal corticothalamic cell; Neocortex V1 L2/6 pyramidal intratelencephalic cell; Neocortex V1 interneuron basket PV cell; Neocortex fast spiking (FS) interneuron; Neocortex spiny stellate cell; Neocortex spiking regular (RS) neuron; Neocortex spiking low threshold (LTS) neuron; Abstract integrate-and-fire adaptive exponential (AdEx) neuron;
Gap Junctions:
Receptor(s): GabaA; AMPA; NMDA;
Transmitter(s): Gaba; Glutamate;
Simulation Environment: NEURON; Python;
Model Concept(s): Synaptic Plasticity; Long-term Synaptic Plasticity; Learning; STDP; Homeostasis;
Implementer(s): Lytton, William [billl at]; Neymotin, Sam [samn at]; Rowan, Mark [m.s.rowan at];
Search NeuronDB for information about:  Neocortex V1 L6 pyramidal corticothalamic cell; Neocortex V1 L2/6 pyramidal intratelencephalic cell; Neocortex V1 interneuron basket PV cell; GabaA; AMPA; NMDA; Gaba; Glutamate;
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// $Id: matpmtmsubpopplug.hoc,v 1.3 2010/10/10 02:34:03 samn Exp $ 

// "plugin" (for batch.hoc) to do analysis on sim data

// want power of: subpop E, total E , total E - subpop . . . bring I along for the ride

binsz = 5 // bin size in ms
sampr = 1e3 / binsz // sampling rate
initAllMyNQs() // initialize counts per time, by type, column, etc.

objref nqf,nqtmp
objref vintraty[numcols][CTYPi] // HUB(SIMTYP) subpop within column
objref vintraE[numcols]         // total of all Es within column
objref vintraI[numcols]         // all Is within column
objref vintraEMINUS[numcols]    // total minus subpop, within column
objref vintraIMINUS[numcols]    // total minus subpop, within column


proc myrsz () { // util func to call matpmtm and add results to nqf
  {vec.resize(0) vec.copy($o1) vec.sub(vec.mean)}
  if("f")==-1) {nqf.resize("f") nqf.v[nqf.m-1].copy(nqtmp.getcol("f"))}
  {nqf.resize($s2) nqf.v[nqf.m-1].copy(nqtmp.getcol("pow"))}

nqf=new NQS()

for i = 0 , numcols - 1 { // setup all the vectors that will have matpmtm run on them
  {vintraE[i]=new Vector(sz)  vintraI[i]=new Vector(sz)}
  {vintraIMINUS[i]=new Vector(sz) vintraEMINUS[i]=new Vector(sz)}
  for j = 0, CTYPi - 1 {
    if(nqCTY[i].v[j].size>0) {
      if(j==SIMTYP) {
        vintraty[i][j]=new Vector(sz)
        vintraty[i][j].copy(nqCTY[i].v[j]) // subpop
      if(ice(j)) {
        if(j!=SIMTYP) vintraIMINUS[i].add(nqCTY[i].v[j]) // total I minus I hub subpop
      } else {
        vintraE[i].add(nqCTY[i].v[j]) // total
        if(j!=SIMTYP) vintraEMINUS[i].add(nqCTY[i].v[j]) // total E minus E hub subpop

for i=0,numcols-1 {
  {sprint(tstr,"C%dintraE",i) myrsz(vintraE[i],tstr)}
  if(ice(SIMTYP)) {
    {sprint(tstr,"C%dintraIMINUS",i) myrsz(vintraIMINUS[i],tstr)}
  } else {
    {sprint(tstr,"C%dintraEMINUS",i) myrsz(vintraEMINUS[i],tstr)}
  {sprint(tstr,"C%dintraI",i) myrsz(vintraI[i],tstr)}
  for j=0,CTYPi-1 if(vintraty[i][j]!=nil) {
    if(vintraty[i][j].size>0) {sprint(tstr,"C%dintra%s",i,CTYP.o(j).s) myrsz(vintraty[i][j],tstr)}


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