def synapses(self): s = h.ExpSyn(self.dend(0.8)) # E0 s.tau = 2 self.synlist.append(s) s = h.ExpSyn(self.dend(0.1)) # I1 s.tau = 5 s.e = -80 self.synlist.append(s)
def createSynapses(self):
"""Add an exponentially decaying synapse """
synsoma = h.ExpSyn(self.soma(0.5))
synsoma.tau = 2
synsoma.e = 0
syndend = h.ExpSyn(self.dend(0.5))
syndend.tau = 2
syndend.e = 0
self.synlist.append(synsoma) # synlist is defined in Cell
self.synlist.append(syndend) # synlist is defined in Cell
def make_synapses(self):
self.synlist = list()
syn = h.ExpSyn(0.5, sec=self.soma)
syn.tau = 5
self.synlist.append(syn)
syn = h.ExpSyn(0.5, sec=self.soma)
syn.tau = 10
syn.e = -80
self.synlist.append(syn)
def construct(self):
#Create soma and two dendrites
self.soma = h.Section()
#Set soma parameters
self.soma.nseg = 1
self.soma.diam = 18.8
self.soma.L = 18.8
self.soma.Ra = 123.0
self.soma.insert('hh')
self.soma.gnabar_hh = 0.25
self.soma.gl_hh = .0001666
self.soma.el_hh = -60.0
#Create dendrite model
self.dend1 = h.Section()
self.dend1.nseg = 5
self.dend1.diam = 3.18
self.dend1.L = 701.9
self.dend1.Ra = 123
self.dend1.insert('pas')
self.dend1.g_pas = .0001666
self.dend1.e_pas = -60.0
#Create dendrite model
self.dend2 = h.Section()
self.dend2.nseg = 5
self.dend2.diam = 2.0
self.dend2.L = 549.1
self.dend2.Ra = 123
self.dend2.insert('pas')
self.dend2.g_pas = .0001666
self.dend2.e_pas = -60.0
#Create axon model
self.axon = h.Section()
self.axon.nseg = 10
self.axon.diam = 2
self.axon.L = 5000
self.axon.Ra = 10000
self.axon.insert('pas')
self.axon.g_pas = .0001666
self.axon.e_pas = -60.0
#Connect two dendrites to soma, as well as axon
self.dend1.connect(self.soma, 0, 1)
self.dend2.connect(self.soma, 1, 0)
self.axon.connect(self.soma, 0.5, 0)
#Add on our synapses! Two on each dendrite, and one on the axon, and one on the soma.
self.syn1 = h.ExpSyn(0.5, sec=self.soma)
self.syn2 = h.ExpSyn(0, sec=self.dend1)
self.syn3 = h.ExpSyn(1, sec=self.dend2)
self.syn4 = h.ExpSyn(1, sec=self.axon)
def add_exp_syn(self, secname, pos=0.5, **kw):
p = combine(default_model_parameters, kw)
syn = h.ExpSyn(self.sections[secname](pos))
syn.tau = p['tau']
self.synapses.append(syn)
return len(self.synapses)-1
def create_synapses(self):
"""Add an exponentially decaying synapse in the middle
of the dendrite. Set its tau to 2ms, and append this
synapse to the synlist of the cell."""
syn = h.ExpSyn(self.dend(0.5))
syn.tau = 2
self.synlist.append(syn) # synlist is defined in Cell
def connect_axon(self, axon):
# configure ExpSyn synapse
synapse = h.ExpSyn(1e-3, axon.allseclist) #1e-3
synapse.e = 10
synapse.i = 0.2
synapse.tau = 0.1
# get spike train
spikeTrain = self.spikeTrains[self.axonIndex]
self.axonIndex += 1
# configure input to synapse
vecStim = h.VecStim()
spikeVec = h.Vector(spikeTrain)
# axon.spikeVec = h.Vector([1,2,3])
vecStim.play(spikeVec)
# connect synapse and VecStim input
netCon = h.NetCon(vecStim, synapse)
netCon.weight[0] = 1
# add the variables to the axon instance in order to keep them alive
# delete after simulation
excitationMechanismVars = [
synapse, vecStim, spikeVec, spikeTrain, netCon
]
axon.append_ex_mech_vars(excitationMechanismVars)
def create_synapses(self):
"""
"""
self.syn_I = h.ExpSyn(self.dend(0.4))
self.syn_I.tau = 17
self.syn_I.e = 0
self.synlist.append(self.syn_I)
self.syn_I_inh = h.ExpSyn(self.dend(0.4))
self.syn_I_inh.tau = 5
self.syn_I_inh.e = -70
self.synlist.append(self.syn_I_inh)
self.syn_II = h.ExpSyn(self.dend(0.8))
self.syn_II.tau = 18
self.syn_II.e = 0
self.synlist.append(self.syn_II) # synlist is defined in Cell
def insert_synapse(self):
"""
This method inserts an exponential synapse at the midpoint of the
cell dendrite.
"""
syn = h.ExpSyn(self.dend(0.5))
syn.tau = 2
return syn
def create_synapses(self, n=1):
"""Add an exponentially decaying synapse in the middle
of the dendrite. Set its tau to 2ms, and append this
synapse to the synlist of the cell."""
for i in xrange(n):
syn = h.ExpSyn(self.dend(0.5))
# syn = h.ExpSyn(self.dend(round(np.random.rand(), 2)))
syn.tau = 2
self.synlist.append(syn) # synlist is defined in Cell
def makeStimulus(soma, simTime):
stimNc = h.NetStim()
stimNc.noise = 1
stimNc.start = 0
stimNc.number = simTime
stimNc.interval = 10
syn = h.ExpSyn(0.5, sec=soma)
nc = h.NetCon(stimNc, syn)
nc.weight[0] = 20
return (stimNc, syn, nc)
def makeStimulus( soma, simTime,NCstrengthStim ): interval = 25 stimNc = h.NetStim() stimNc.noise = 1 stimNc.start = 0 stimNc.number = simTime stimNc.interval = interval syn = h.ExpSyn (0.5, sec = soma) nc = h.NetCon(stimNc, syn) nc.weight[0] = NCstrengthStim return (stimNc, syn, nc)
def makeStimulus( soma, simTime ): interval = 25 stimNc = h.NetStim() stimNc.noise = 1 stimNc.start = ceil(25*rand(1,1)) stimNc.number = simTime stimNc.interval = interval syn = h.ExpSyn (0.5, sec = soma) nc = h.NetCon(stimNc, syn) nc.weight[0] = 20 return (stimNc, syn, nc)
def main(var):
global nc_w, nc_d
setting = {'geometry': celldim(soma_d=12.6157, soma_l=12.6157, dend_d=1, dend_l=100, dend_seg=101),
'biophysics': cellbiophy(Ra=100, Cm=1, soma_hh_gnabar=0.12, soma_hh_gkbar=0.036, soma_hh_gl=0.0003, soma_hh_el=-54.3, dend_g=0.001, dend_e=-65)}
N=3
var = np.float(var)
deviation = lambda r: np.random.standard_normal(N)*r
cell_settings = []
for i in range(N):
set = {}
set['geometry'] = celldim(soma_d=12.6157, soma_l=12.6157, dend_d=1, dend_l=100, dend_seg=101)
set['biophysics'] = cellbiophy(Ra=100, Cm=1, soma_hh_gnabar=0.12 + 0.12*deviation(var)[i],
soma_hh_gkbar=0.036 + 0.036*deviation(var)[i], soma_hh_gl= 0.0003 + 0.0003*deviation(var)[i],
soma_hh_el=-54.3, dend_g=0.001, dend_e=-65)
cell_settings.append(set)
cells = [BallAndStick(settings) for settings in cell_settings]
nclist = []
esyns = []
# Connect neuron in ring.
for i in range(N):
src = cells[i]
tgt = cells[(i+1)%N]
syn = h.ExpSyn(tgt.dend(0.5))
esyns.append(syn)
nc = h.NetCon(src.soma(0.5)._ref_v, syn, sec=src.soma)
nc.weight[0] = nc_w
nc.delay = nc_d
nclist.append(nc)
# Create AlphaSynapse for init network
syn = h.AlphaSynapse(cells[0].dend(0.5))
syn.gmax = 0.1
syn.tau = 1
syn.onset = 20
syn.e = 0
# Create output tables
t_vec = h.Vector()
soma1_vec = h.Vector()
soma2_vec = h.Vector()
soma3_vec = h.Vector()
t_vec.record(h._ref_t)
soma1_vec.record(cells[0].soma(0.5)._ref_v)
soma2_vec.record(cells[1].soma(0.5)._ref_v)
soma3_vec.record(cells[2].soma(0.5)._ref_v)
# Run simulation
h.tstop = 50
h.run()
# plot results
plt.plot(t_vec, soma1_vec, t_vec, soma2_vec, t_vec, soma3_vec)
def define_biophysics(self, syn_loc):
"""Assign the membrane properties across the cell."""
for sec in self.all: # 'all' exists in parent object.
sec.Ra = 70 # Axial resistance in Ohm * cm
sec.cm = 1 # Membrane capacitance in micro Farads / cm^2
# Insert active Hodgkin-Huxley current in the soma
self.dap_syn_ = h.Exp2Syn(self.soma(0.5))
self.dap_syn_.tau1 = 2
self.dap_syn_.tau2 = 5
self.dap_syn_.e = 50
self.dap_nc_ = h.NetCon(self.soma(0.5)._ref_v,\
self.dap_syn_, sec=self.soma)
self.dap_nc_.delay = 0
self.dap_nc_.threshold = 10
self.dend_syn = h.Exp2Syn(self.dend(syn_loc))
#self.dend_syn.tau1 = 1
#self.dend_syn.tau2 = 17
self.dend_syn = h.ExpSyn(self.dend(syn_loc))
self.dend_syn.tau = .5
self.dend_syn.e = 0
self.soma.insert('clarke')
# FINAL VERSIONS
self.soma.gl_clarke = 0.003
self.soma.tau_n_bar_clarke = 7
self.dap_nc_.weight[0] = 7.5e-3
self.soma.gkrect_clarke = 0.6
# SWEEP VALUES
#self.soma.gcaN_clarke = 0
#self.soma.gcaL_clarke = 0
#self.soma.gcak_clarke = 0
#self.soma.gnapbar_clarke = 0
#self.soma.tau_mc_clarke = 0
#self.soma.tau_hc_clarke = 0
#self.soma.tau_n_bar_clarke = 0
#self.dap_nc_.weight[0] = 0
#self.soma.gkrect_clarke = 0
#self.soma.gnabar_clarke = 0
#self.soma.insert('pas')
#self.soma.g_pas = 1e-3 # Passive conductance in S/cm2
#self.soma.e_pas = -64 # Leak reversal potential mV
#self.soma.insert('extracellular')
# Insert passive current in the dendrite
self.dend.insert('pas')
self.dend.g_pas = 0.001 # Passive conductance in S/cm2
self.dend.e_pas = -54.3 # Leak reversal potential mV
def create_synapse(self, type):
""" Create and return a synapse that links motoneuron state variables to external events.
The created synapse is also appended to a list containg all synapses the this motoneuron has.
Keyword arguments:
type -- type of synapse to be created. This could be:
1) "excitatory" to create an excitatory synapse positioned on the dendritic tree
2) "inhibitory" to create an inhibitory synapse positioned on the soma
3) "ees" to create a synapse that mimic the recruitmend induced by electrical
stimulation; in this case the synapse is positioned on the axon.
"""
if type == "excitatory":
# from Iaf to Mn we usually have 5 boutons for synapse
nBoutonsXsyn = 5
n = 0
for i in range(nBoutonsXsyn):
n += np.random.poisson(4)
n = round(n / nBoutonsXsyn) - 2 # mean and shift to 0
if n < 0: n = 0
elif n > self._nDendrites: n = self._nDendrites - 1
x = rnd.random()
syn = h.ExpSyn(self.dendrite[int(n)](x))
syn.tau = 0.5
syn.e = 0
self.synapses.append(syn)
elif type == "inhibitory":
syn = h.Exp2Syn(self.soma(0.5))
syn.tau1 = 1.5
syn.tau2 = 2
syn.e = -75
self.synapses.append(syn)
elif type == "ees":
syn = h.ExpSyn(self.node[3](0.5))
syn.tau = 0.1
syn.e = 50
self.synapses.append(syn)
return syn
def activate_hoc_syn(self,
source,
targetCell,
threshold=10.0,
delay=0.0,
weight=0.0):
x = targetCell.sections[self.secID].relPts[self.ptID]
hocSec = targetCell.sections[self.secID]
self.syn = h.ExpSyn(x, hocSec)
self.syn.tau = 1.7
self.syn.e = 0.0
self.netcon = h.NetCon(source, self.syn, threshold, delay, weight)
self._active = True
def create_synapses(self):
"""Add an exponentially decaying synapse in the middle
of the dendrite. Set its tau to 2ms, and append this
synapse to the synlist of the cell."""
syn = h.ExpSyn(self.dend[0](0.1))
syn.tau = 3
self.synlist.append(syn) # synlist is defined in Cell
syn = h.ExpSyn(self.dend[5](0.1))
syn.tau = 3
self.synlist.append(syn) # synlist is defined in Cell
syn = h.Exp2Syn(self.soma(0.3))
syn.tau1 = 3
syn.tau2 = 10
syn.e = -85
self.synlist.append(syn) # synlist is defined in Cell
syn = h.Exp2Syn(self.soma(0.5))
syn.tau1 = 3
syn.tau2 = 10
syn.e = -85
self.synlist.append(syn) # synlist is defined in Cell
def __init__(self, romans=0, judeans=1):
self.source_section = h.Section()
self.source = self.source_section(0.5)._ref_v
#self.synapse = h.tmgsyn(self.source_section(0.5))
self.record = Mock()
self.record_v = Mock()
self.record_gsyn = Mock()
self.memb_init = Mock()
self.excitatory = h.ExpSyn(self.source_section(0.5))
self.inhibitory = None
self.romans = romans
self.judeans = judeans
self.foo_init = -99.9
self.traces = {}
def __init__(self, id, nsec):
r = h.Random()
r.Random123(id, 0, 0)
nsec += int(r.discunif(0, 4)) # for nontrivial cell_permute=1
self.id = id
self.secs = [
h.Section(name="d" + str(i), cell=self) for i in range(nsec)
]
# somewhat random tree, d[0] plays role of soma with connections to
# d[0](0.5) and all others to 1.0
for i in range(1, nsec):
iparent = int(r.discunif(0, i - 1))
x = 0.5 if iparent == 0 else 1.0
self.secs[i].connect(self.secs[iparent](x))
# uniform L and diam but somewhat random passive g and e
for i, sec in enumerate(self.secs):
sec.L = 10 if i > 0 else 5
sec.diam = 1 if i > 0 else 5
sec.insert("pas")
sec.g_pas = 0.0001 * r.uniform(1.0, 1.1)
sec.e_pas = -65 * r.uniform(1.0, 1.1)
# IClamp and ExpSyn at every location (even duplicates) with random
# parameters (would rather use a Shunt, but ...)
self.ics = []
self.syns = []
self.netcons = []
self.netstim = h.NetStim()
self.netstim.number = 1
self.netstim.start = 0.0
for sec in self.secs:
for seg in sec.allseg():
ic = h.IClamp(seg)
ic.delay = 0.1
ic.dur = 1.0
ic.amp = 0.001 * r.uniform(1.0, 1.1)
self.ics.append(ic)
syn = h.ExpSyn(seg)
syn.e = -65 * r.uniform(1.0, 1.1)
syn.tau = r.uniform(0.1, 1.0)
self.syns.append(syn)
nc = h.NetCon(self.netstim, syn)
nc.delay = 0.2
nc.weight[0] = 0.001 * r.uniform(1.0, 1.1)
self.netcons.append(nc)
def synapses(self):
'''
Adds synapses
'''
for i in range(10):
for sec in self.dend:
s = h.ExpSyn(sec(0.5)) # Excitatory
s.tau = 0.1
s.e = 50
self.synlistex.append(s)
s = h.ExpSyn(sec(0.5)) # Inhibitory
s.tau = 0.5
s.e = -80
self.synlistinh.append(s)
s = h.ExpSyn(self.soma(0.1)) # Excitatory
s.tau = 0.35
s.e = 50
self.synlistex.append(s)
s = h.Exp2Syn(self.soma(0.5)) # Inhibitory
s.tau1 = 0.5
s.tau2 = 3.5
s.e = -80
self.synlistinh.append(s)
def makeStimulus( Neurons, simTime, stimInterval ): interval = stimInterval stimNc = h.NetStim() stimNc.noise = 1 stimNc.start = 0 stimNc.number = simTime/interval stimNc.interval = interval syn = h.ExpSyn (0.5, sec = Neurons.soma[0]) nc = h.NetCon(stimNc, syn) nc.weight[0] = 1 #For recording events... tvec = h.Vector() #time idvec = h.Vector() #cell number nc.record(tvec, idvec) return (stimNc, syn, nc, tvec, idvec)
def makeStimulus(soma, simTime):
interval = 50
stimNc = h.NetStim()
stimNc.noise = 1
stimNc.start = 0
stimNc.number = simTime
stimNc.interval = interval
syn = h.ExpSyn(0.5, sec=soma)
nc = h.NetCon(stimNc, syn)
nc.weight[0] = 100
#For recording events...
tvec = h.Vector() #time
idvec = h.Vector() #cell number
nc.record(tvec, idvec)
return (stimNc, syn, nc, tvec, idvec)
def __init__(self, n):
self.ncell = [1, n, 1]
self.nlayer = len(self.ncell)
self.cells = {}
# make cells
for ilayer in range(self.nlayer):
for icell in range(self.ncell[ilayer]):
gid = self.info2gid(ilayer, icell)
if (gid % pc.nhost()) == pc.id():
cell = BallAndStick(gid, float(icell), float(ilayer), 0.0,
0.0)
self.cells[gid] = cell
cell.ilayer = ilayer
cell.icell = icell
pc.set_gid2node(gid, pc.id())
pc.cell(gid, self.cells[gid]._spike_detector)
# make connections (all to all from layer i-1 to layer i)
self.nclist = {}
for gid, cell in self.cells.items():
if cell.ilayer > 0:
src_ilayer = cell.ilayer - 1
for src_icell in range(self.ncell[src_ilayer]):
srcgid = self.info2gid(src_ilayer, src_icell)
nc = pc.gid_connect(srcgid, cell.syn)
nc.weight[0] = 0.01
nc.delay = 20
self.nclist[(srcgid, gid)] = nc
# stimulate gid 0 with NetStim
if 0 in self.cells:
self.ns = h.NetStim()
self.ncstim = h.NetCon(self.ns, self.cells[0].syn)
ns = self.ns
ns.start = 6
ns.interval = 10
ns.number = 100
nc = self.ncstim
nc.delay = 2
nc.weight[0] = 0.01
# For some extra coverage of BBSaveState::node01
if 100 in self.cells:
cell = self.cells[100]
self.xsyns = [h.ExpSyn(seg) for seg in cell.dend.allseg()]
self.xnc = []
for syn in self.xsyns:
nc = pc.gid_connect(0, syn)
nc.delay = 20
nc.weight[0] = 0.0001
self.xnc.append(nc)
def add_ExpSyn(self, section='soma', position=0.5, name='default', tstim=[50], w=.001):
"""
Create/replace an Expsyn synapse on a given section which is active at the time in tstim
Comments
--------
The sort command is here to make sure that tstim are in the right order. This method
requires the pre-compiling of vecstim.mod by NEURON.
"""
self.syn[name] = h.ExpSyn(self.cell.__getattribute__(section)(position))
self.stim[name] = h.Vector(np.sort(tstim)) # Converting tstim into a NEURON vector (to play in NEURON)
self.vplay[name] = h.VecStim() # Creating play vectors to interface with NEURON
self.vplay[name].play(self.stim[name]) # Connecting vector to VecStim object to play them
self.netcon[name] = h.NetCon(self.vplay[name], self.syn[name]) # Building the netcon object to connect the stims and the synapses
self.netcon[name].weight[0] = w # Setting the individual weights
def model():
pc.gid_clear()
for s in h.allsec():
h.delete_section(sec=s)
s = h.Section()
s.L = 10
s.diam = 10
s.insert("hh")
ic = h.IClamp(s(0.5))
ic.delay = 0.1
ic.dur = 0.1
ic.amp = 0.5 * 0
syn = h.ExpSyn(s(0.5))
nc = h.NetCon(None, syn)
nc.weight[0] = 0.001
return {"s": s, "ic": ic, "syn": syn, "nc": nc}
def constructConnections2( connections, numNeurons, Neurons, inhibInd, delay, strength ): """ This definition will a connectivity matrix and make the appropriate CHEMICAL JUNCTIONS. """ SYN = [] NC = [] for i in range(0, numNeurons): count = 0 for j in range(0, numNeurons): if abs(float(connections[i][j])) > 0: syn = h.ExpSyn (0.5, sec = Neurons[j].soma[0]) #Target Neurons[i].soma[0].push() nc = h.NetCon( Neurons[i].soma[0](0.5)._ref_v, syn ) #Source w = float(connections[i][j]) mu, sigma = 1, 0.1 # mean and standard deviation #s = numpy.random.normal(mu, sigma, 1) #s = strength s1 = 20 s2 = 1 #Determine weight from particular type of connection if i < inhibInd: #This means the source is EXCITATORY if j < inhibInd: #E -> E #nc.weight[0] = s*w*0.5 nc.weight[0] = 0.05*s1 else: #E -> I #nc.weight[0] = s*w*0.1 nc.weight[0] = 0.2*s1 else: #This means the source is INHIBITORY if j < inhibInd: #I -> E #nc.weight[0] = -s*w*0.1 nc.weight[0] = -0.05*s2 else: #I -> I #nc.weight[0] = -s*w*0.5 nc.weight[0] = -0.1*s2 #nc.threshold = 1 #Determine delay from intersomatic distance if float(delay[i][j]) > 155: # Long range speed nc.delay = float(delay[i][j])/300 else: # Short range speed nc.delay = float(delay[i][j])/150 NC.append(nc) SYN.append(syn) return (SYN,NC)
def __init__(self, gid):
s = {i: h.Section(name=i, cell=self) for i in ["soma", "dend", "axon"]}
s["dend"].connect(s["soma"](0))
s["axon"].connect(s["soma"](1))
self.soma = s["soma"]
a = s["axon"]
self.sections = s
for s in self.sections.values():
s.L = 10
s.diam = 10 if "soma" in s.name() else 1
s.insert("hh")
self.syn = h.ExpSyn(self.sections["dend"](0.5))
self.syn.e = 0
self.gid = gid
pc.set_gid2node(gid, pc.id())
pc.cell(gid, h.NetCon(a(1)._ref_v, None, sec=a))
def constructConnections2(connections, numNeurons, Neurons):
"""
This definition will a connectivity matrix and make the appropriate synaptic connections.
"""
SYN = []
NC = []
for i in range(0, numNeurons):
count = 0
for j in range(0, numNeurons):
if connections[i][j] == 1:
syn = h.ExpSyn(0.5, sec=Neurons[j])
Neurons[i].push()
nc = h.NetCon(Neurons[i](0.5)._ref_v, syn)
nc.weight[0] = 1
SYN.append(syn)
NC.append(nc)
return (SYN, NC)
def constructConnections( connections, dendrites, numNeurons, Soma, Axon, Dendrites, strength ): """ This definition will a connectivity matrix and make the appropriate synaptic connections. """ SYN = [] NC = [] for i in range(0, numNeurons): count = 0 for j in range(0, numNeurons): if int(connections[i][j]) == 1: syn = h.ExpSyn (0.5, sec = Axon[j]) Dendrites[i][count].push() nc = h.NetCon( Dendrites[i][count](0.5)._ref_v, syn ) nc.weight[0] = strength SYN.append(syn) NC.append(nc) count = count + 1 return (SYN,NC)