Dendrite#
A Dendrite
is a sub-group of a Projection
, gathering the synapses
between the pre-synaptic population and a single post-synaptic neuron.
ANNarchy.core.Dendrite.Dendrite
#
A Dendrite
is a sub-group of a Projection
, gathering the synapses between the pre-synaptic population and a single post-synaptic neuron.
It can not be created directly, only through a call to Projection.dendrite(rank)
:
dendrite = proj.dendrite(6)
Source code in ANNarchy/core/Dendrite.py
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pre_ranks
property
#
List of ranks of pre-synaptic neurons.
size
property
#
Number of synapses.
synapses
property
#
Iteratively returns the synapses corresponding to this dendrite.
create_synapse(rank, w=0.0, delay=0)
#
Creates a synapse for this dendrite with the given pre-synaptic neuron.
Parameters:
-
rank
–rank of the pre-synaptic neuron
-
w
–synaptic weight (defalt: 0.0).
-
delay
–synaptic delay (default = dt)
Source code in ANNarchy/core/Dendrite.py
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create_synapses(ranks, weights=None, delays=None)
#
Creates a synapse for this dendrite with the given pre-synaptic neuron.
Parameters:
-
ranks
–rank of the pre-synaptic neuron
-
weights
–synaptic weight (defalt: 0.0).
-
delays
–synaptic delay (default = dt)
Source code in ANNarchy/core/Dendrite.py
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get(name)
#
Returns the value of a variable/parameter.
Example:
dendrite.get('w')
Parameters:
-
name
–name of the parameter/variable.
Source code in ANNarchy/core/Dendrite.py
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prune_synapse(rank)
#
Removes the synapse with the given pre-synaptic neuron from the dendrite.
Parameters:
-
rank
–rank of the pre-synaptic neuron
Source code in ANNarchy/core/Dendrite.py
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prune_synapses(ranks)
#
Removes the synapses which belong to the provided pre-synaptic neurons from the dendrite.
Parameters:
-
ranks
–list of ranks of the pre-synaptic neurons
Source code in ANNarchy/core/Dendrite.py
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receptive_field(variable='w', fill=0.0)
#
Returns the given variable as a receptive field.
A Numpy array of the same geometry as the pre-synaptic population is returned.
Non-existing synapses are replaced by zeros (or the value fill
).
Parameters:
-
variable
–name of the variable (default = 'w')
-
fill
–value to use when a synapse does not exist (default: 0.0).
Source code in ANNarchy/core/Dendrite.py
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set(value)
#
Sets the value of a parameter/variable of all synapses.
Example:
dendrite.set( { 'tau' : 20, 'w'= Uniform(0.0, 1.0) } )
Parameters:
-
value
–a dictionary containing the parameter/variable names as keys.
Source code in ANNarchy/core/Dendrite.py
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synapse(pos)
#
Returns the synapse coming from the corresponding presynaptic neuron.
Parameters:
-
pos
–can be either the rank or the coordinates of the presynaptic neuron
Source code in ANNarchy/core/Dendrite.py
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