Computer models of corticospinal neurons replicate in vitro dynamics (Neymotin et al. 2017)

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"Corticospinal neurons (SPI), thick-tufted pyramidal neurons in motor cortex layer 5B that project caudally via the medullary pyramids, display distinct class-specific electrophysiological properties in vitro: strong sag with hyperpolarization, lack of adaptation, and a nearly linear frequency-current (FI) relationship. We used our electrophysiological data to produce a pair of large archives of SPI neuron computer models in two model classes: 1. Detailed models with full reconstruction; 2. Simplified models with 6 compartments. We used a PRAXIS and an evolutionary multiobjective optimization (EMO) in sequence to determine ion channel conductances. ..."
1 . Neymotin SA, Suter BA, Dura-Bernal S, Shepherd GM, Migliore M, Lytton WW (2017) Optimizing computer models of corticospinal neurons to replicate in vitro dynamics. J Neurophysiol 117:148-162 [PubMed]
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: Neocortex;
Cell Type(s): Neocortex M1 L5B pyramidal pyramidal tract cell; Neocortex primary motor area pyramidal layer 5 corticospinal cell;
Channel(s): I A; I h; I_KD; I K,Ca; I L high threshold; I Na,t; I N; Ca pump; Kir;
Gap Junctions:
Simulation Environment: NEURON; Python;
Model Concept(s): Parameter Fitting; Activity Patterns; Active Dendrites; Detailed Neuronal Models; Simplified Models;
Implementer(s): Suter, Benjamin ; Neymotin, Sam [samn at]; Dura-Bernal, Salvador [salvadordura at]; Forzano, Ernie ;
Search NeuronDB for information about:  Neocortex M1 L5B pyramidal pyramidal tract cell; I Na,t; I L high threshold; I N; I A; I h; I K,Ca; I_KD; Ca pump; Kir;
misc.mod *
vecst.mod *
PTcell.BS0284.cfg *
PTcell.cfg *
// $Id: misc.h,v 1.38 2011/11/02 15:26:48 billl Exp $

#include <stdlib.h>
#include <math.h>
#include <limits.h> /* contains LONG_MAX */
#include <time.h>
#include <pthread.h>

#if !defined(t)
  #define _pval pval

typedef struct LISTVEC {
  int isz;
  Object* pL;
  double** pv;
  unsigned int* plen;
  unsigned int* pbuflen;
} ListVec;

typedef struct BVEC {
 int size;
 int bufsize;
 short *x;
 Object* o;
} bvec;

#define BYTEHEADER int _II__;  char *_IN__; char _OUT__[16]; int BYTESWAP_FLAG=0;
#define BYTESWAP(_X__,_TYPE__) \
    if (BYTESWAP_FLAG == 1) { \
	_IN__ = (char *) &(_X__); \
	for (_II__=0;_II__<sizeof(_TYPE__);_II__++) { \
		_OUT__[_II__] = _IN__[sizeof(_TYPE__)-_II__-1]; } \
	(_X__) = *((_TYPE__ *) &_OUT__); \

#define UNCODE(_X_,_J_,_Y_) {(_Y_)=floor((_X_)/sc[(_J_)])/sc[4]; \
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))

//square root of 2 * PI
#define SQRT2PI 2.5066282746310002416
//ln(2), base e log of 2
#define LG2 0.69314718055994530941723212145818
#define VRRY 200
#define ISVEC(_OB__) (strncmp(hoc_object_name(_OB__),"Vector",6)==0)
#define dmaxuint 4294967295. // for 32 bits

// Andre Fentons cast designations
typedef	unsigned char	ui1;	/* one byte unsigned integer */
typedef	char		si1;	/* one byte signed integer */
typedef unsigned short	ui2;	/* two byte unsigned integer */
typedef short		si2;	/* two byte signed integer */
typedef unsigned int	ui4;	/* four byte unsigned integer */ 
typedef int		si4;	/* four byte signed integer */ 
typedef float		sf4;	/* four byte signed floating point number */ 
typedef double		sf8;	/* eight byte signed floating point number */ 


extern double *vector_newsize();
extern unsigned int  dcrsz;
extern double       *dcr;
extern double       *dcrset(int);
extern unsigned int  scrsz;
extern unsigned int *scr;
extern unsigned int *scrset(int);
extern unsigned int  iscrsz;
extern int *iscr;
extern int *iscrset(int);
extern double BVBASE;
extern double* hoc_pgetarg();
extern void hoc_notify_iv();
extern double hoc_call_func(Symbol*, int narg);
extern FILE* hoc_obj_file_arg(int narg);
extern Object** hoc_objgetarg();
char *gargstr();
char** hoc_pgargstr();
extern void vector_resize();
extern int vector_instance_px();
extern void* vector_arg();
extern double* vector_vec();
extern int vector_buffer_size(void*);
extern double hoc_epsilon;
extern int stoprun;
extern void set_seed();
extern void dshuffle(double* x,int nx);
extern int nrn_mlh_gsort();
extern int ivoc_list_count(Object*);
extern Object* ivoc_list_item(Object*, int);
extern int list_vector_px2();
extern int hoc_is_double_arg(int narg);
extern int hoc_is_str_arg(int narg);
extern int hoc_is_object_arg(int narg);
extern int hoc_is_pdouble_arg(int narg);
extern Symbol *hoc_get_symbol(char *);
extern Symbol *hoc_lookup(const char*);
extern Point_process* ob2pntproc(Object*);

extern char* hoc_object_name(Object*);
extern int cmpdfn();
extern int openvec(int, double **);
int list_vector_px();
double *list_vector_resize();
static void hxe() { hoc_execerror("",0); }
extern void FreeListVec(ListVec** pp);
extern ListVec* AllocListVec(Object* p);
extern ListVec* AllocILV(Object*, int, double *);
void FillListVec(ListVec* p,double dval);
void ListVecResize(ListVec* p,int newsz);
extern short *nrn_artcell_qindex_;
extern double nrn_event_queue_stats(double*);
extern void clear_event_queue();

static double sc[6];
static FILE*  testout;

//* in vecst.mod
extern int** getint2D(int rows,int cols);
extern void freeint2D(int*** ppp,int rows);
extern double** getdouble2D(int rows,int cols);
extern void freedouble2D(double*** ppp,int rows);
extern double ismono1 (double *x, int n, int flag);

//* in stats.mod
double kcorfast(double* input1, double* input2, double* i1d , double* i2d,int n,double* ps);
double Rktau (double* x, double* y, int n); // R version
double kcorfast (double* input1, double* input2, double* i1d , double* i2d,int n,double* ps);

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