hh_psc_alpha_clopath – Hodgkin-Huxley neuron model with support for Clopath plasticity¶
Description¶
hh_psc_alpha_clopath
is an implementation of a spiking neuron using the
Hodgkin-Huxley formalism and that is capable of connecting to a Clopath
synapse.
(1) Postsynaptic currents Incoming spike events induce a postsynaptic change of current modelled by an alpha function. The alpha function is normalized such that an event of weight 1.0 results in a peak current of 1 pA.
(2) Spike Detection Spike detection is done by a combined threshold-and-local-maximum search: if there is a local maximum above a certain threshold of the membrane potential, it is considered a spike.
Parameters¶
The following parameters can be set in the status dictionary.
Dynamic state variables |
||
V_m |
mV |
Membrane potential |
u_bar_plus |
mV |
Low-pass filtered Membrane potential |
u_bar_minus |
mV |
Low-pass filtered Membrane potential |
u_bar_bar |
mV |
Low-pass filtered u_bar_minus |
Membrane Parameters |
||
E_L |
mV |
Leak reversal potential |
C_m |
pF |
Capacity of the membrane |
g_L |
nS |
Leak conductance |
tau_ex |
ms |
Rise time of the excitatory synaptic alpha function |
tau_in |
ms |
Rise time of the inhibitory synaptic alpha function |
E_Na |
mV |
Sodium reversal potential |
g_Na |
nS |
Sodium peak conductance |
E_K |
mV |
Potassium reversal potential |
g_K |
nS |
Potassium peak conductance |
Act_m |
real |
Activation variable m |
Inact_h |
real |
Inactivation variable h |
Act_n |
real |
Activation variable n |
I_e |
pA |
External input current |
Clopath rule parameters |
||
A_LTD |
1/mV |
Amplitude of depression |
A_LTP |
1/mV^2 |
Amplitude of facilitation |
theta_plus |
mV |
Threshold for u |
theta_minus |
mV |
Threshold for u_bar_[plus/minus] |
A_LTD_const |
boolean |
Flag that indicates whether A_LTD_ should be constant (true, default) or multiplied by u_bar_bar^2 / u_ref_squared (false). |
delay_u_bars |
real |
Delay with which u_bar_[plus/minus] are processed to compute the synaptic weights. |
U_ref_squared |
real |
Reference value for u_bar_bar_^2. |
Problems/Todo¶
better spike detection
initial wavelet/spike at simulation onset
References¶
Sends¶
SpikeEvent
Receives¶
SpikeEvent, CurrentEvent, DataLoggingRequest