Prosthetic electrostimulation for information flow repair in a neocortical simulation (Kerr 2012)

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This model is an extension of a model (<a href="">138379</a>) recently published in Frontiers in Computational Neuroscience. This model consists of 4700 event-driven, rule-based neurons, wired according to anatomical data, and driven by both white-noise synaptic inputs and a sensory signal recorded from a rat thalamus. Its purpose is to explore the effects of cortical damage, along with the repair of this damage via a neuroprosthesis.
1 . Kerr CC, Neymotin SA, Chadderdon GL, Fietkiewicz CT, Francis JT, Lytton WW (2012) Electrostimulation as a prosthesis for repair of information flow in a computer model of neocortex IEEE Transactions on Neural Systems & Rehabilitation Engineering 20(2):153-60 [PubMed]
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 pyramidal corticothalamic L6 cell; Neocortex V1 pyramidal intratelencephalic L2-5 cell; Neocortex V1 interneuron basket PV cell; Neocortex fast spiking (FS) interneuron; Neocortex spiny stellate cell;
Channel(s): I Chloride; I Sodium; I Potassium;
Gap Junctions:
Receptor(s): GabaA; AMPA; NMDA; Gaba;
Transmitter(s): Gaba; Glutamate;
Simulation Environment: NEURON;
Model Concept(s): Activity Patterns; Deep brain stimulation; Information transfer; Brain Rhythms;
Implementer(s): Lytton, William [billl at]; Neymotin, Sam [samn at]; Kerr, Cliff [cliffk at];
Search NeuronDB for information about:  Neocortex V1 pyramidal corticothalamic L6 cell; Neocortex V1 pyramidal intratelencephalic L2-5 cell; Neocortex V1 interneuron basket PV cell; GabaA; AMPA; NMDA; Gaba; I Chloride; I Sodium; I Potassium; Gaba; Glutamate;
infot.mod *
intf6_.mod *
intfsw.mod *
misc.mod *
nstim.mod *
staley.mod *
stats.mod *
vecst.mod *
decmat.hoc *
decnqs.hoc *
default.hoc *
drline.hoc *
infot.hoc *
local.hoc *
misc.h *
ratlfp.dat *
setup.hoc *
simctrl.hoc *
spkts.hoc *
staley.hoc *
stats.hoc *
stdgui.hoc *
syncode.hoc *
updown.hoc *
xgetargs.hoc *
// $Id: updown.hoc,v 1.116 2010/09/09 15:56:12 samn Exp $

print "Loading updown.hoc..."


{declare("test_do_graphs", 1)}
{declare("drawlr", 1, "drawth", 1,"drawscale",0,"shapesz",15,"flipit",0)}
{declare("minthreshlx", 0, "maxthreshlx",9e3*printStep)}

// {gvnew(-2) panobj.read_vfile("/u/billl/nrniv/sync/data/05nov02.501/v05nov02.1000")}
// panobj.rv(7)
// vec.copy(panobj.vrtmp)
// vec.mul(-1)
// gg(vec,printStep)
// objref output
// output=updown(vec)

// updown(vec[,nq,#CUTS,LOGCUT,MIN]) -- use updown() to find spikes
// other options
pos_updown=1 // set to 1 to move whole curve up above 0
maxp_updown=0.95 // draw top sample at 95% of max 
minp_updown=0.05 // draw bottom sample at 5% of max
over_updown=1    // turn over and try again if nothing found
allover_updown=0 // turn over and add these locs (not debugged)
verbose_updown=0 // give messages, can also turn on DEBUG_VECST for messages from updn()

//** updown - calls Vector updown function and returns NQS with spikes/bumps
obfunc updown () { local a,ii,npts,logflag,min,x,sz,midp localobj bq,cq,v1,v2,v3,bb,tl,vtmp
  if (verbose_updown) printf("MAXTIME appears to be %g (printStep=%g)\n",$o1.size*printStep,printStep)
  npts=10 // n sample locations
  tl=new List()
  if (numarg()>1) cq=$o2 else cq=new NQS()
  if (cq.m!=10) { cq.resize(0) 
  if (numarg()>2) npts=$3
  if (numarg()>3) logflag=$4 else logflag=0
  if (numarg()>4) {
    if (npts!=$o5.size) printf("Correcting npts from %d to %d\n",npts,npts=$o5.size)
    if ($o5.ismono(1)) $o5.reverse
    if (! $o5.ismono(-1)) {printf("updown: Arg 5 (%s) must be monotonic\n",$o5) return}
//  if (numarg()>5) dynflag=$6 else dynflag=0

  v1=mso[a+0] v2=mso[a+1] v3=mso[a+2]
  for ii=0,npts-1 tl.append(mso[ii+a+3])
  if (pos_updown) {
    v1.sub(min) // make it uniformly positive
  } else min=0
  if (numarg()>4) v2.copy($o5) else {
    if(logflag==2){ //"double-log" spacing

      midp = v1.max * 0.5 //50% of max is center of log axis in vertical direction

      // 1/2 of lines btwn max and midpoint
      vtmp=new Vector()


      // 1/2 of lines btwn min and midpoint


      //make sure they're monotonically increasing

    } else {
      v2.indgen(2,2+npts-1,1)   // sampling at npts points, start at 2 to avoid log(1)=0
      if (logflag) v2.log() // log sampling
      v2.scale(-maxp_updown*v1.max,-minp_updown*v1.max) v2.mul(-1)

  if(dynamic_th) { //allocate memory so updown can use th

  vec0.copy(v2) // <--------- whats this for? copies threshold lines to global vec0

  //v2 = thresh

  if (pos_updown) { bq.v[1].add(min) bq.v[3].add(min) }
  if (allover_updown) { // do it upside down as well
    v1.mul(-1) // v2 will be upside-down
    if (pos_updown) {min=v1.min v1.sub(min)}
    bq.v[8].add(sz) bq.v[4].mul(-1) // turn HEIGHT upside down
  } else if (over_updown && sz==0) { // turn it over an try again
    print "updown() checking upside-down"
    v1.mul(-1) // v2 will be upside-down
  for case(&x,0,2,5) cq.v[x].mul(printStep)
  return cq

//** testupdown($o1=input vector,$2=num slices,$3=logarithmic-spaced slices,$o4=thresholds slices locations)
// runs updown on input vector and returns an NQS with detected spikes/bumps
obfunc testupdown (){ local idx,left,right,x,a localobj vtmp,output,vec
  {a=allocvecs(vec) output = new NQS() vec.copy($o1)}
  if(flipit) vec.mul(-1)
  } else if(numarg()>2){
  } else{
  if(test_do_graphs){ if(g==nil) gg()
    gg(vec,printStep,black,3) //5 is for thick lines       
    output.v[1].mark(g,output.v,"o",shapesz,red,1) //draw circles at top of peaks
    if(drawlr) for(idx=0;idx<output.v.size;idx+=1){
      left = output.v[5].x(idx)
      right = left+output.v[2].x(idx)
      g.mark(left, vec.x(left/printStep), "t",shapesz,blue ,1)
     // draw horizontal lines for slices
    if(drawth) for vtr(&x,vec0) drline(minthreshlx,x,maxthreshlx,x,red,1)
  return output

Kerr CC, Neymotin SA, Chadderdon GL, Fietkiewicz CT, Francis JT, Lytton WW (2012) Electrostimulation as a prosthesis for repair of information flow in a computer model of neocortex IEEE Transactions on Neural Systems & Rehabilitation Engineering 20(2):153-60[PubMed]

References and models cited by this paper

References and models that cite this paper

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(38 refs)