A multilayer cortical model to study seizure propagation across microdomains (Basu et al. 2015)

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Accession:206238
A realistic neural network was used to simulate a region of neocortex to obtain extracellular LFPs from ‘virtual micro-electrodes’ and produce test data for comparison with multisite microelectrode recordings. A model was implemented in the GENESIS neurosimulator. A simulated region of cortex was represented by layers 2/3, 5/6 (interneurons and pyramidal cells) and layer 4 stelate cells, spaced at 25 µm in each horizontal direction. Pyramidal cells received AMPA and NMDA inputs from neighboring cells at the basal and apical dendrites. The LFP data was generated by simulating 16-site electrode array with the help of ‘efield’ objects arranged at the predetermined positions with respect to the surface of the simulated network. The LFP for the model is derived from a weighted average of the current sources summed over all cellular compartments. Cell models were taken from from Traub et al. (2005) J Neurophysiol 93(4):2194-232.
References:
1 . Basu I, Kudela P, Korzeniewska A, Franaszczuk PJ, Anderson WS (2015) A study of the dynamics of seizure propagation across micro domains in the vicinity of the seizure onset zone. J Neural Eng 12:046016 [PubMed]
2 . Basu I, Kudela P, Anderson WS (2014) Determination of seizure propagation across microdomains using spectral measures of causality. Conf Proc IEEE Eng Med Biol Soc 2014:6349-52 [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 U1 L2/6 pyramidal intratelencephalic GLU cell; Neocortex U1 L5B pyramidal pyramidal tract GLU cell; Thalamus reticular nucleus GABA cell; Neocortex spiking low threshold (LTS) neuron; Neocortex spiking regular (RS) neuron; Neocortex layer 2-3 interneuron; Neocortex layer 5 interneuron;
Channel(s): I Na,p; I Na,t; I K; I A; I M; I h; I K,Ca; I A, slow; I L high threshold; I T low threshold; I Calcium;
Gap Junctions: Gap junctions;
Receptor(s): AMPA; GabaA; NMDA;
Gene(s):
Transmitter(s): Glutamate; Gaba; Amino Acids;
Simulation Environment: GENESIS;
Model Concept(s): Activity Patterns; Epilepsy;
Implementer(s): Anderson, WS ; Kudela, Pawel ;
Search NeuronDB for information about:  Thalamus reticular nucleus GABA cell; Neocortex U1 L5B pyramidal pyramidal tract GLU cell; Neocortex U1 L2/6 pyramidal intratelencephalic GLU cell; GabaA; AMPA; NMDA; I Na,p; I Na,t; I L high threshold; I T low threshold; I A; I K; I M; I h; I K,Ca; I Calcium; I A, slow; Amino Acids; Gaba; Glutamate;
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BasuEtAl2015
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ModelDescription.pdf
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P6RSd_P6RSc.g
P6RSd_P6RSd.g
P6RSd_P6RSd_Gap.g
P6RSd_raninput.g
P6RSd_ST4RS.g
P6RSd_synapsedefs.g
P6RSd_TCR.g
P6RSdcell3Dpk.p
P6RSdchanpk.g
P6RSdprotodefs.g
P6RSsyncond.g
pgenesis_command
protodefs.g
protospikeB23FS.g
protospikeB5FS.g
protospikeC23FS.g
protospikeC5FS.g
protospikeI23LTS.g
protospikeI5LTS.g
protospikenRT.g
protospikeP23FRBa.g
protospikeP23RSa.g
protospikeP23RSb.g
protospikeP23RSc.g
protospikeP23RSd.g
protospikeP5IBa.g
protospikeP5IBb.g
protospikeP5IBc.g
protospikeP5IBd.g
protospikeP5RSa.g
protospikeP6RSa.g
protospikeP6RSb.g
protospikeP6RSc.g
protospikeP6RSd.g
protospikeST4RS.g
protospikeTCR.g
randominputdefs.g
spikedefs.g
ST4RS.g
ST4RS_B23FS.g
ST4RS_B5FS.g
ST4RS_C23FS.g
ST4RS_C5FS.g
ST4RS_I23LTS.g
ST4RS_I5LTS.g
ST4RS_P23FRBa.g
ST4RS_P23RSa.g
ST4RS_P23RSb.g
ST4RS_P23RSc.g
ST4RS_P23RSd.g
ST4RS_P5IBa.g
ST4RS_P5IBb.g
ST4RS_P5IBc.g
ST4RS_P5IBd.g
ST4RS_P5RSa.g
ST4RS_P6RSa.g
ST4RS_P6RSb.g
ST4RS_P6RSc.g
ST4RS_P6RSd.g
ST4RS_raninput.g
ST4RS_ST4RS.g
ST4RS_ST4RS_Gap.g
ST4RS_synapsedefs.g
ST4RScell3Dpk.p
ST4RSchanpk.g
ST4RSprotodefs.g
ST4RSsyncond.g
synapticdelays.g *
synapticprobsTraub.g
synchansB23FS.g *
synchansB5FS.g *
synchansC23FS.g *
synchansC5FS.g *
synchansI23LTS.g *
synchansI5LTS.g *
synchansnRT.g *
synchansP23FRBa.g *
synchansP23RSa.g *
synchansP23RSb.g *
synchansP23RSc.g *
synchansP23RSd.g *
synchansP5IBa.g *
synchansP5IBb.g *
synchansP5IBc.g *
synchansP5IBd.g *
synchansP5RSa.g *
synchansP6RSa.g *
synchansP6RSb.g *
synchansP6RSc.g *
synchansP6RSd.g *
synchansSPIKEs.g *
synchansSPIKEs_base.g
synchansST4RS.g
synchansTCR.g *
syncond.g
syncond2.g
TCR.g
TCR_B23FS.g
TCR_B5FS.g
TCR_C23FS.g
TCR_C5FS.g
TCR_nRT.g
TCR_P23FRBa.g
TCR_P23RSa.g
TCR_P23RSb.g
TCR_P23RSc.g
TCR_P23RSd.g
TCR_P5IBa.g
TCR_P5IBb.g
TCR_P5IBc.g
TCR_P5IBd.g
TCR_P5RSa.g
TCR_P6RSa.g
TCR_P6RSb.g
TCR_P6RSc.g
TCR_P6RSd.g
TCR_raninput.g
TCR_ST4RS.g
TCR_synapsedefs.g
TCRcellpk.p
TCRchanpk.g
TCRprotodefs.g
TCRsyncond.g
                            
//genesis

/* FILE INFORMATION
** "Generic" excitatory (glutamate) and inhibitory (GABA) synaptically
**  activated channels  (based on mitsyn.g by Upi Bhalla)
**
** The channels have an alpha_function type conductance change for
** each synaptic event.
**
** Modified by D. Beeman for GENESIS 2.0 syntax and synchan object - 5/19/94
*/

// CONSTANTS
float EGlu = 0.0
float EGABA = -0.075
float SOMA_A = 1e-9
float GGlu = SOMA_A * 50 
// Actual conductance set by channel field in .p file
float GGABA = SOMA_A * 50

// CONSTANTS for NMDA Channel
float CMg = 1.5     // [Mg] in mM
float eta = 0.33    // per mM
float gamma = 60    // per Volt

//===================================================================
//                     SYNAPTIC CHANNELS   (Values guessed at)
//===================================================================

function make_Ex_ch21P6RSAMPA

// AMPA synapse for P6RS - nRT

	if ({exists Ex_ch21P6RSAMPA})
		return
	end

	create		synchan	Ex_ch21P6RSAMPA
    	setfield	        Ex_ch21P6RSAMPA \
		Ek			{EGlu} \
		tau1		{ 1.0e-3 } \	// sec
		tau2		{ 1.0e-3 } \ 	// sec
		gmax		{GGlu} // Siemens
end

function make_Ex_ch21P6RSNMDA

// NMDA synapse for P6RS - nRT

    if ({exists Ex_ch21P6RSNMDA})
        return
    end

    create  synchan  Ex_ch21P6RSNMDA

        setfield     Ex_ch21P6RSNMDA     \
        Ek           {EGlu}         \
        tau1         { 100.0e-3 }    \ // sec
        tau2         { 0.67e-3 }   \ // sec
        gmax         {GGlu}           // Siemens

    create Mg_block Ex_ch21P6RSNMDA/block
        setfield         Ex_ch21P6RSNMDA/block \
        CMg              {CMg}            \
        KMg_A            {1.0/eta}        \
        KMg_B            {1.0/gamma}      

    addmsg Ex_ch21P6RSNMDA Ex_ch21P6RSNMDA/block CHANNEL Gk Ek

    addmsg Ex_ch21P6RSNMDA/block . CHANNEL Gk Ek

    addmsg . Ex_ch21P6RSNMDA/block VOLTAGE Vm

    // Even though we don't use the channel current, CHECK expects this message.

    // addmsg . Ex_ch1NMDA VOLTAGE Vm

end

function make_Ex_ch21TCRAMPA

// AMPA synapse for TCR - nRT

	if ({exists Ex_ch21TCRAMPA})
		return
	end

	create		synchan	Ex_ch21TCRAMPA
    	setfield	        Ex_ch21TCRAMPA \
		Ek			{EGlu} \
		tau1		{ 2.0e-3 } \	// sec
		tau2		{ 2.0e-3 } \ 	// sec
		gmax		{GGlu} // Siemens
end

function make_Ex_ch21TCRNMDA

// NMDA synapse for TCR - nRT

    if ({exists Ex_ch21TCRNMDA})
        return
    end

    create  synchan  Ex_ch21TCRNMDA

        setfield     Ex_ch21TCRNMDA     \
        Ek           {EGlu}         \
        tau2         { 0.67e-3 }    \ // sec
        tau1         { 150.0e-3 }   \ // sec
        gmax         {GGlu}           // Siemens

    create Mg_block Ex_ch21TCRNMDA/block
        setfield         Ex_ch21TCRNMDA/block \
        CMg              {CMg}            \
        KMg_A            {1.0/eta}        \
        KMg_B            {1.0/gamma}      

    addmsg Ex_ch21TCRNMDA Ex_ch21TCRNMDA/block CHANNEL Gk Ek

    addmsg Ex_ch21TCRNMDA/block . CHANNEL Gk Ek

    addmsg . Ex_ch21TCRNMDA/block VOLTAGE Vm

    // Even though we don't use the channel current, CHECK expects this message.

    // addmsg . Ex_ch21TCRNMDA VOLTAGE Vm

end

function make_Inh_ch21nRTGABAa

//GABA_A synapse for nRT - nRT

	if ({exists Inh_ch21nRTGABAa})
		return
	end

	create		synchan	Inh_ch21nRTGABAa
    	setfield	        Inh_ch21nRTGABAa \
	Ek			{ EGABA } \
	tau1		{ 9.0e-3 } \	// sec
    tau2        { 44.5e-3 } \    // sec
	gmax		{GGABA}		// Siemens
end


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