Dentate gyrus granule cell: subthreshold signal processing (Schmidt-Hieber et al. 2007)

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Detailed compartmental cable models of 8 hippocampal granule cells of adult mice were obtained from dual patch-clamp whole-cell recordings and subsequent 3D reconstructions. This code allows to reproduce figures 6-8 from the paper.
1 . Schmidt-Hieber C, Jonas P, Bischofberger J (2007) Subthreshold dendritic signal processing and coincidence detection in dentate gyrus granule cells. J Neurosci 27:8430-41 [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): Dentate gyrus granule GLU cell;
Gap Junctions:
Receptor(s): AMPA; Glutamate;
Transmitter(s): Glutamate;
Simulation Environment: NEURON;
Model Concept(s): Parameter Fitting; Influence of Dendritic Geometry; Synaptic Integration;
Implementer(s): Schmidt-Hieber, Christoph [ at];
Search NeuronDB for information about:  Dentate gyrus granule GLU cell; AMPA; Glutamate; Glutamate;
// ----------------------------------------------------------------------------
// membrane.hoc
// loads the full cell morphology, inserts passive
// membrane properties, corrects membrane resistance
// and capacitance for spines, and corrects (roughly) 
// for temperature if needed
// 2007-08-17, Christoph Schmidt-Hieber, University of Freiburg
// accompanies the publication:
// Schmidt-Hieber C, Jonas P, Bischofberger J (2007)
// Subthreshold Dendritic Signal Processing and Coincidence Detection 
// in Dentate Gyrus Granule Cells. J Neurosci 27:8430-8441
// send bug reports and suggestions to
// 2007-08-31: adheres to NetworkReadyCell policy
// 2017-03-26: Added Golding et al. (2005) CA1 pyramidal cell
// Golding NL, Mickus TJ, Katz Y, Kath WL, Spruston N (2005)
// Factors mediating powerful voltage attenuation along CA1 pyramidal neuron
// dendrites. J Physiol 568:69-82.
// Downloaded from spruston/sk_models/JP_2005/
// ----------------------------------------------------------------------------

// load gui or stdrun:


begintemplate cell_11

public is_art, art_axon
public init, topol, basic_shape, subsets, geom, biophys, geom_nseg, biophys_inhomo
public synlist, x, y, z, position, connect2target
public somaLoc,somaBorderLoc,blebLoc,distalDendLoc,proxDendLoc,synDendLoc,spineCount,n_sections,n_axon
public section
public all,den,axo
public Vrest

external verbose,debug_mode,accuracy,calc_spines
external q10_cm,q10_g_pas,q10_Ra,tempScale,geom_nseg_shared,lambda_f

objref somaLoc,somaBorderLoc,blebLoc,distalDendLoc,proxDendLoc,synDendLoc,spineCount,this,synlist
objref all,den,axo
objref primary_apical_list
objref nospines
objref basal_list
objref apical_list
objref basals
objref med_spines_rad
objref med_spines_LM
objref max_spines_rad
objref thin_rad
objref thin_LM

proc init() {
    if (debug_mode) print "Loaded cell, n_sections=",n_sections
    synlist = new List()
    x = y = z = 0 // only change via position

// dummy compartments, will be updated later:
create section[1]

proc init_spines() {
    forall { insert spines scale_spines=1.0 }
    forsec nospines 		{ scale_spines=1.0 }
    forsec basals 			{ scale_spines=2.7 }
    forsec med_spines_rad 	{ scale_spines=1.2 }
    forsec max_spines_rad 	{ scale_spines=1.6 }
    forsec thin_rad 		{ scale_spines=2.6 }
    forsec med_spines_LM 	{ scale_spines=1.1 }
    forsec thin_LM 			{ scale_spines=1.2 }

proc init_pas() {local global_ra, Cm, Rm, rmsoma, Vleak, nablock, target, ipass, init_h, rmend, rmhalfdis, rmsteep, dis
    global_ra=139.09	// internal resistivity in ohm-cm
    Cm=1.70944          // specific membrane capacitance in uF/cm^2
    Rm=16428.5    	    // specific membrane resistivity in ohm-cm^2  get this from fit of tau_m, assuming Cm=1
    Vleak=-72			// leak reversal
    Vrest=-72			// resting potential -63 in control
    nablock=1     	 	// fraction of na current blocked by TTX
    target=59.42      	// input resistance target in CsCl
    ipass=2						// =1 for uniform Rm, =2 for nonuniform Rm
    init_h=5					// =1 for uniform Ih, =2 for nonuniform Ih
    hblock=0					// between 0 and 1, for fraction blocked. use as 0 or 1
    // attenuation is 0.515 in CsCl for this cell
    // passive membrane parameters determined by fitting Cs data
    if (ipass>1) {
	// nonuniform Rm values
    if ((ipass==2) && (init_h==5) && (hblock<1)) {
	// nonuniform Rm and nonuniform gh
        if (celsius > 30) {
        } else {
	minq=0.1002 		// units are pS/um2
	maxq=14.349 		// units are pS/um2
    print "Inserting passive membrane"
    forall {insert pas Ra=global_ra e_pas=Vleak}
    forall {insert dv}
    if (ipass==1) {
    	forall { g_pas=1/(Rm/scale_spines) cm=Cm*scale_spines Ra = global_ra }
    if (ipass==2) {
    	somaLoc.secRef.sec distance()
    	printf("rmsoma = %3.0f, rmend = %3.0f, rmsteep = %3.0f\n",rmsoma, rmend, rmsteep)
    	    { g_pas=1/(rmpoint/scale_spines) cm=Cm*scale_spines Ra = global_ra }
    v_init = Vrest
    insert_h()			// insert h conductance

proc insert_h() {
    printf("Inserting sag conductance in all segments: %d pecent blocked\n",hblock*100)
    forall { insert h gbar_h=0 }
    init_h5(a0_h*1000)	// initialize nonuniform Rm, nonuniform Ih
proc init_h5() {local dis, hpoint
    // scale up sag conductance as a sigmoidal function of distance from the soma
    // q=minq+(maxq-minq)/(1+exp((-dis-qhalfdis)/qsteep))
    // basals are set to the same value as the soma
    // set minq, maxq, and qhalfdis and qsteep in init_params
    somaLoc.secRef.sec distance()
	{ gbar_h=hpoint*scale_spines*(1-hblock) }
    forsec basals{
	{ gbar_h=minq*scale_spines*(1-hblock) }	

proc basic_shape() {localobj morphoFile
    n_sections = 154
    n_axon = 0
    create section[n_sections]
    xopen("./cell_11/ri06.nrn")			// geometry
    // define soma:
    section[0]  somaLoc = new Location(0.5)
    section[0]  somaBorderLoc = new Location(0)
    // define dendritic sites:
    section[152] distalDendLoc = new Location(0.0)
    section[72] proxDendLoc = new Location(0.05)
    section[152] synDendLoc = new Location(0.0)
    access somaLoc.secRef.sec

proc topol() {
    {section[0] connect section[1](0), 1.000000}
    {section[1] connect section[6](0), 1}
    {section[1] connect section[7](0), 1}
    {section[7] connect section[15](0), 1}
    {section[15] connect section[28](0), 1}
    {section[28] connect section[48](0), 1}
    {section[28] connect section[49](0), 1}
    {section[15] connect section[29](0), 1}
    {section[29] connect section[50](0), 1}
    {section[29] connect section[51](0), 1}
    {section[7] connect section[16](0), 1}
    {section[16] connect section[30](0), 1}
    {section[30] connect section[52](0), 1}
    {section[30] connect section[53](0), 1}
    {section[16] connect section[31](0), 1}
    {section[0] connect section[2](0), 0.709232}
    {section[2] connect section[8](0), 1}
    {section[2] connect section[9](0), 1}
    {section[9] connect section[17](0), 1}
    {section[17] connect section[32](0), 1}
    {section[32] connect section[54](0), 1}
    {section[32] connect section[55](0), 1}
    {section[17] connect section[33](0), 1}
    {section[33] connect section[56](0), 1}
    {section[56] connect section[72](0), 1}
    {section[56] connect section[73](0), 1}
    {section[73] connect section[84](0), 1}
    {section[84] connect section[96](0), 1}
    {section[84] connect section[97](0), 1}
    {section[73] connect section[85](0), 1}
    {section[33] connect section[57](0), 1}
    {section[57] connect section[74](0), 1}
    {section[57] connect section[75](0), 1}
    {section[75] connect section[86](0), 1}
    {section[75] connect section[87](0), 1}
    {section[9] connect section[19](0), 1}
    {section[19] connect section[34](0), 1}
    {section[34] connect section[58](0), 1}
    {section[34] connect section[59](0), 1}
    {section[19] connect section[35](0), 1}
    {section[35] connect section[60](0), 1}
    {section[35] connect section[61](0), 1}
    {section[61] connect section[76](0), 1}
    {section[61] connect section[77](0), 1}
    {section[77] connect section[88](0), 1}
    {section[77] connect section[89](0), 1}
    {section[0] connect section[3](0), 0.443475}
    {section[3] connect section[10](0), 1}
    {section[10] connect section[20](0), 1}
    {section[10] connect section[21](0), 1}
    {section[21] connect section[36](0), 1}
    {section[21] connect section[37](0), 1}
    {section[37] connect section[62](0), 1}
    {section[37] connect section[63](0), 1}
    {section[3] connect section[18](0), 1}
    {section[18] connect section[22](0), 1}
    {section[22] connect section[38](0), 1}
    {section[22] connect section[39](0), 1}
    {section[18] connect section[23](0), 1}
    {section[23] connect section[40](0), 1}
    {section[23] connect section[41](0), 1}
    {section[0] connect section[4](0), 1.000000}
    {section[4] connect section[11](0), 1}
    {section[4] connect section[12](0), 1}
    {section[12] connect section[24](0), 1}
    {section[12] connect section[25](0), 1}
    {section[25] connect section[42](0), 1}
    {section[42] connect section[64](0), 1}
    {section[42] connect section[65](0), 1}
    {section[25] connect section[43](0), 1}
    {section[43] connect section[66](0), 1}
    {section[66] connect section[78](0), 1}
    {section[66] connect section[79](0), 1}
    {section[43] connect section[67](0), 1}
    {section[0] connect section[5](0), 0.000000}
    {section[5] connect section[13](0), 1}
    {section[5] connect section[14](0), 1}
    {section[14] connect section[26](0), 1}
    {section[26] connect section[44](0), 1}
    {section[26] connect section[45](0), 1}
    {section[14] connect section[27](0), 1}
    {section[27] connect section[46](0), 1}
    {section[46] connect section[68](0), 1}
    {section[46] connect section[69](0), 1}
    {section[69] connect section[80](0), 1}
    {section[69] connect section[81](0), 1}
    {section[81] connect section[90](0), 1}
    {section[81] connect section[91](0), 1}
    {section[27] connect section[47](0), 1}
    {section[47] connect section[70](0), 1}
    {section[47] connect section[71](0), 1}
    {section[71] connect section[82](0), 1}
    {section[82] connect section[92](0), 1}
    {section[82] connect section[93](0), 1}
    {section[71] connect section[83](0), 1}
    {section[83] connect section[94](0), 1}
    {section[94] connect section[98](0), 1}
    {section[94] connect section[99](0), 1}
    {section[99] connect section[102](0), 1}
    {section[99] connect section[104](0), 1}
    {section[104] connect section[107](0), 1}
    {section[104] connect section[108](0), 1}
    {section[83] connect section[95](0), 1}
    {section[95] connect section[100](0), 1}
    {section[95] connect section[101](0), 1}
    {section[101] connect section[105](0), 1}
    {section[101] connect section[103](0), 1}
    {section[103] connect section[109](0), 1}
    {section[109] connect section[110](0), 1}
    {section[109] connect section[153](0), 1}
    {section[103] connect section[106](0), 1}
    {section[106] connect section[111](0), 1}
    {section[106] connect section[112](0), 1}
    {section[112] connect section[113](0), 1}
    {section[112] connect section[114](0), 1}
    {section[114] connect section[115](0), 1}
    {section[115] connect section[117](0), 1}
    {section[115] connect section[118](0), 1}
    {section[114] connect section[116](0), 1}
    {section[116] connect section[119](0), 1}
    {section[119] connect section[121](0), 1}
    {section[119] connect section[122](0), 1}
    {section[122] connect section[125](0), 1}
    {section[125] connect section[128](0), 1}
    {section[125] connect section[129](0), 1}
    {section[122] connect section[130](0), 1}
    {section[116] connect section[120](0), 1}
    {section[120] connect section[123](0), 1}
    {section[120] connect section[124](0), 1}
    {section[124] connect section[126](0), 1}
    {section[124] connect section[127](0), 1}
    {section[127] connect section[131](0), 1}
    {section[127] connect section[132](0), 1}
    {section[132] connect section[133](0), 1}
    {section[133] connect section[135](0), 1}
    {section[133] connect section[136](0), 1}
    {section[136] connect section[139](0), 1}
    {section[136] connect section[140](0), 1}
    {section[140] connect section[143](0), 1}
    {section[140] connect section[144](0), 1}
    {section[132] connect section[134](0), 1}
    {section[134] connect section[137](0), 1}
    {section[134] connect section[138](0), 1}
    {section[138] connect section[141](0), 1}
    {section[141] connect section[145](0), 1}
    {section[141] connect section[146](0), 1}
    {section[146] connect section[149](0), 1}
    {section[146] connect section[150](0), 1}
    {section[138] connect section[142](0), 1}
    {section[142] connect section[147](0), 1}
    {section[142] connect section[148](0), 1}
    {section[148] connect section[151](0), 1}
    {section[148] connect section[152](0), 1}

proc subsets() { local i
    objref all,den,axo
    objref primary_apical_list
    objref nospines
    objref basal_list
    objref apical_list
    objref basals
    objref med_spines_rad
    objref med_spines_LM
    objref max_spines_rad
    objref thin_rad
    objref thin_LM
    primary_apical_list = new SectionList()
    section[0] primary_apical_list.append
    section[5] primary_apical_list.append 
    section[14] primary_apical_list.append 
    section[27] primary_apical_list.append 
    section[47] primary_apical_list.append 
    section[71] primary_apical_list.append 
    section[83] primary_apical_list.append 
    section[95] primary_apical_list.append 
    section[101] primary_apical_list.append 
    section[103] primary_apical_list.append 
    section[106] primary_apical_list.append 
    section[112] primary_apical_list.append 
    section[114] primary_apical_list.append 
    section[116] primary_apical_list.append 
    section[120] primary_apical_list.append 
    section[124] primary_apical_list.append 
    section[127] primary_apical_list.append 
    section[132] primary_apical_list.append 

    nospines = new SectionList()
    section[1] nospines.append()
    section[7] nospines.append()
    section[15] nospines.append()
    section[2] nospines.append()
    section[9] nospines.append()
    section[17] nospines.append()
    section[3] nospines.append()
    section[10] nospines.append()
    section[18] nospines.append()
    section[4] nospines.append()
    section[5] nospines.append() 
    section[14] nospines.append() 
    section[27] nospines.append() 

    basal_list = new SectionList()
    section[1] basal_list.append()
    section[7] basal_list.append()
    section[15] basal_list.append()
    section[2] basal_list.append()
    section[9] basal_list.append()
    section[17] basal_list.append()
    section[3] basal_list.append()
    section[10] basal_list.append()
    section[18] basal_list.append()
    section[4] basal_list.append()

    apical_list = new SectionList()
    section[5] apical_list.append() 
    section[14] apical_list.append() 
    section[27] apical_list.append() 

    basals = new SectionList()
    access section[1]
    access section[2]
    access section[3]
    access section[4]
    section[1] basals.remove()
    section[7] basals.remove()
    section[15] basals.remove()
    section[2] basals.remove()
    section[9] basals.remove()
    section[17] basals.remove()
    section[3] basals.remove()
    section[10] basals.remove()
    section[18] basals.remove()
    section[4] basals.remove()

    med_spines_rad = new SectionList()
    section[47] med_spines_rad.append()		//medium spiny
    section[71] med_spines_rad.append()		//medium spiny 
    section[83] med_spines_rad.append()		//medium spiny
    section[95] med_spines_rad.append()		//medium spiny 
    section[101] med_spines_rad.append()		//medium spiny 
    section[103] med_spines_rad.append()		//medium spiny 
    section[106] med_spines_rad.append()		//medium spiny
    section[112] med_spines_rad.append()		//medium spiny
    section[114] med_spines_rad.append()		//medium spiny

    med_spines_LM = new SectionList()
    section[138] med_spines_LM.append()	//medium spiny
    section[133] med_spines_LM.append()	//medium spiny

    max_spines_rad = new SectionList()
    section[116] max_spines_rad.append()		//very spiny
    section[120] max_spines_rad.append()		//very spiny
    section[124] max_spines_rad.append()		//very spiny
    section[127] max_spines_rad.append()		//very spiny 
    section[132] max_spines_rad.append()	//very spiny
    section[134] max_spines_rad.append()	//very spiny

    thin_rad = new SectionList()
    access section[5]
    section[5] thin_rad.remove()
    section[14] thin_rad.remove() 
    section[27] thin_rad.remove()
    section[47] thin_rad.remove()		//medium spiny
    section[71] thin_rad.remove()		//medium spiny 
    section[83] thin_rad.remove()		//medium spiny
    section[95] thin_rad.remove()		//medium spiny 
    section[101] thin_rad.remove()	//medium spiny 
    section[103] thin_rad.remove()		//medium spiny 
    section[106] thin_rad.remove()		//medium spiny
    section[112] thin_rad.remove()		//medium spiny
    section[114] thin_rad.remove()	//medium spiny
    section[116] thin_rad.remove()		//very spiny
    section[120] thin_rad.remove()		//very spiny
    section[124] thin_rad.remove()		//very spiny
    section[127] thin_rad.remove()		//very spiny 
    section[132] thin_rad.remove()	//very spiny
    section[134] thin_rad.remove()	//very spiny
    section[138] thin_rad.remove()	//medium spiny
    section[133] thin_rad.remove()	//medium spiny
    section[131] thin_rad.remove()
    section[137] thin_rad.remove()
    section[141] thin_rad.remove()
    section[145] thin_rad.remove()
    section[146] thin_rad.remove()
    section[149] thin_rad.remove()
    section[150] thin_rad.remove()
    section[142] thin_rad.remove()
    section[147] thin_rad.remove()
    section[148] thin_rad.remove()
    section[151] thin_rad.remove()
    section[152] thin_rad.remove()
    section[135] thin_rad.remove()
    section[136] thin_rad.remove()
    section[139] thin_rad.remove()
    section[140] thin_rad.remove()
    section[143] thin_rad.remove()
    section[144] thin_rad.remove()

    thin_LM = new SectionList()
    section[131] thin_LM.append()
    section[137] thin_LM.append()
    section[141] thin_LM.append()
    section[145] thin_LM.append()
    section[146] thin_LM.append()
    section[149] thin_LM.append()
    section[150] thin_LM.append()
    section[142] thin_LM.append()
    section[147] thin_LM.append()
    section[148] thin_LM.append()
    section[151] thin_LM.append()
    section[152] thin_LM.append()
    section[135] thin_LM.append()
    section[136] thin_LM.append()
    section[139] thin_LM.append()
    section[140] thin_LM.append()
    section[143] thin_LM.append()
    section[144] thin_LM.append()
    all = new SectionList()
    for i=0, n_sections-1 section[i] all.append()
    den = new SectionList()
    for i=1, n_sections-1 section[i] den.append()
    axo = new SectionList()

proc geom() {

proc geom_nseg() {
    // increase nseg even further (tribute to Josef):
    if (accuracy >= 1) {
        forall nseg*=3

proc biophys() {

proc biophys_inhomo(){}

proc position() { local i
  somaLoc.secRef.sec for i = 0, n3d()-1 {
    pt3dchange(i, $1-x+x3d(i), $2-y+y3d(i), $3-z+z3d(i), diam3d(i))
  x = $1  y = $2  z = $3

obfunc connect2target() {localobj nc //$o1 target point process, optional $o2 returned NetCon
  somaLoc.secRef.sec nc = new NetCon(&v(1), $o1)
  nc.threshold = 10
  if (numarg() == 2) { $o2 = nc } // for backward compatibility
  return nc

objref syn_
proc synapses() {

func is_art() { return 0 }

endtemplate cell_11