CA1 pyramidal neuron: synaptically-induced bAP predicts synapse location (Sterratt et al. 2012)

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This is an adaptation of Poirazi et al.'s (2003) CA1 model that is used to measure BAP-induced voltage and calcium signals in spines after simulated Schaffer collateral synapse stimulation. In the model, the peak calcium concentration is highly correlated with soma-synapse distance under a number of physiologically-realistic suprathreshold stimulation regimes and for a range of dendritic morphologies. There are also simulations demonstrating that peak calcium can be used to set up a synaptic democracy in a homeostatic manner, whereby synapses regulate their synaptic strength on the basis of the difference between peak calcium and a uniform target value.
1 . Sterratt DC, Groen MR, Meredith RM, van Ooyen A (2012) Spine calcium transients induced by synaptically-evoked action potentials can predict synapse location and establish synaptic democracy. PLoS Comput Biol 8:e1002545 [PubMed]
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Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell;
Brain Region(s)/Organism:
Cell Type(s): Hippocampus CA1 pyramidal GLU cell;
Channel(s): I Na,t; I L high threshold; I T low threshold; I A; I K; I M; I Mixed; I R; I_AHP;
Gap Junctions:
Receptor(s): AMPA; NMDA;
Simulation Environment: NEURON;
Model Concept(s): Dendritic Action Potentials; Synaptic Plasticity;
Implementer(s): Sterratt, David ; Groen, Martine R [martine.groen at];
Search NeuronDB for information about:  Hippocampus CA1 pyramidal GLU cell; AMPA; NMDA; I Na,t; I L high threshold; I T low threshold; I A; I K; I M; I Mixed; I R; I_AHP;
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choose-secs.hoc *
current-balance.hoc *
cut-sections.hoc *
deduce-ratio.hoc *
find-gmax.hoc *
GABA_shiftsyn.hoc *
GABA_shiftsyn_bg.hoc *
ken.h *
map-segments-to-3d.hoc *
maxmin.hoc *
newshiftsyn.exe *
num-rec.h *
salloc.hoc *
shiftsyn-init_bg.hoc *
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spikecount.hoc *
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vector-distance.hoc *
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This file contains all Numerical Recipes that I use.


/********* Begin of Numerical Recipes routines **********/

#define M1 259200
#define IA1 7141
#define IC1 54773
#define RM1 (1.0/M1)
#define M2 134456
#define IA2 8121
#define IC2 28411
#define RM2 (1.0/M2)
#define M3 243000
#define IA3 4561
#define IC3 51349

 *  numerical recipes random gaussian number generator

float gasdev(idum)
     int *idum;
  static int iset=0;
  static float gset;
  float fac,r,v1,v2;
  float ran1();
  if  (iset == 0) {
    do {
    } while (r >= 1.0);
    return v2*fac;
  } else {
    return gset;

 *	gaussian - return a gaussian random number of
 *		   variance 1 and mean 0

float gaussian ()
	int seed = 0;

	return ( gasdev(&seed) );

 *  numerical recipes random number generator

float ran1(idum)
     int *idum;
  static long ix1,ix2,ix3;
  static float r[98];
  float temp;
  static int iff=0;
  int j;
  void nrerror();
  if (*idum < 0 || iff == 0) {
    ix1=(IC1-(*idum)) % M1;
    ix1=(IA1*ix1+IC1) % M1;
    ix2=ix1 % M2;
    ix1=(IA1*ix1+IC1) % M1;
    ix3=ix1 % M3;
    for (j=1;j<=97;j++) {
      ix1=(IA1*ix1+IC1) % M1;
      ix2=(IA2*ix2+IC2) % M2;
  ix1=(IA1*ix1+IC1) % M1;
  ix2=(IA2*ix2+IC2) % M2;
  ix3=(IA3*ix3+IC3) % M3;
  j=1 + ((97*ix3)/M3);
  if (j > 97 || j < 1) nrerror("RAN1: This cannot happen.");
  return temp;

 *  numerical recipes error routine

void nrerror(error_text)
     char error_text[];
  /*	void exit();
  fprintf(stderr,"Numerical Recipes run-time error...\n");
  fprintf(stderr," exiting to system...\n");

#undef M1
#undef IA1
#undef IC1
#undef RM1
#undef M2
#undef IA2
#undef IC2
#undef RM2
#undef M3
#undef IA3
#undef IC3

/********* End of Numerical Recipes routines **********/