brainpy.dyn.synapses.GABAa
brainpy.dyn.synapses.GABAa#
- class brainpy.dyn.synapses.GABAa(pre, post, conn, conn_type='dense', g_max=0.04, delay_step=None, E=- 80.0, alpha=0.53, beta=0.18, T=1.0, T_duration=1.0, method='exp_auto', name=None)[source]#
GABAa conductance-based synapse model.
Model Descriptions
GABAa synapse model has the same equation with the AMPA synapse,
\[\begin{split}\frac{d g}{d t}&=\alpha[T](1-g) - \beta g \\ I_{syn}&= - g_{max} g (V - E)\end{split}\]but with the difference of:
Reversal potential of synapse \(E\) is usually low, typically -80. mV
Activating rate constant \(\alpha=0.53\)
De-activating rate constant \(\beta=0.18\)
Transmitter concentration \([T]=1\,\mu ho(\mu S)\) when synapse is triggered by a pre-synaptic spike, with the duration of 1. ms.
Model Examples
- Parameters
pre (NeuGroup) – The pre-synaptic neuron group.
post (NeuGroup) – The post-synaptic neuron group.
conn (optional, ndarray, JaxArray, dict of (str, ndarray), TwoEndConnector) – The synaptic connections.
conn_type (str) – The connection type used for model speed optimization. It can be sparse and dense. The default is dense.
delay_step (int, ndarray, JaxArray, Initializer, Callable) – The delay length. It should be the value of \(\mathrm{delay\_time / dt}\).
E (float, JaxArray, ndarray) – The reversal potential for the synaptic current. [mV]
g_max (float, ndarray, JaxArray, Initializer, Callable) – The synaptic strength (the maximum conductance). Default is 1.
alpha (float, JaxArray, ndarray) – Binding constant. Default 0.062
beta (float, JaxArray, ndarray) – Unbinding constant. Default 3.57
T (float, JaxArray, ndarray) – Transmitter concentration when synapse is triggered by a pre-synaptic spike.. Default 1 [mM].
T_duration (float, JaxArray, ndarray) – Transmitter concentration duration time after being triggered. Default 1 [ms]
name (str) – The name of this synaptic projection.
method (str) – The numerical integration methods.
References
- 1
Destexhe, Alain, and Denis Paré. “Impact of network activity on the integrative properties of neocortical pyramidal neurons in vivo.” Journal of neurophysiology 81.4 (1999): 1531-1547.
- __init__(pre, post, conn, conn_type='dense', g_max=0.04, delay_step=None, E=- 80.0, alpha=0.53, beta=0.18, T=1.0, T_duration=1.0, method='exp_auto', name=None)[source]#
Methods
__init__
(pre, post, conn[, conn_type, ...])check_post_attrs
(*attrs)Check whether post group satisfies the requirement.
check_pre_attrs
(*attrs)Check whether pre group satisfies the requirement.
dg
(g, t, TT)get_delay_data
(name, delay_step, *indices)Get delay data according to the provided delay steps.
ints
([method])Collect all integrators in this node and the children nodes.
load_states
(filename[, verbose])Load the model states.
nodes
([method, level, include_self])Collect all children nodes.
register_delay
(name, delay_step, delay_target)Register delay variable.
register_implicit_nodes
(nodes)register_implicit_vars
(variables)reset
()Reset function which reset the whole variables in the model.
reset_delay
(name, delay_target)Reset the delay variable.
save_states
(filename[, variables])Save the model states.
train_vars
([method, level, include_self])The shortcut for retrieving all trainable variables.
unique_name
([name, type_])Get the unique name for this object.
update
(t, dt)The function to specify the updating rule.
update_delay
(name, delay_data)Update the delay according to the delay data.
vars
([method, level, include_self])Collect all variables in this node and the children nodes.
Attributes
global_delay_vars
name
steps