inhomogeneous_poisson_generator – Provides Poisson spike trains at a piecewise constant rate¶
The inhomogeneous Poisson generator provides Poisson spike trains at a piecewise constant rate to the connected node(s). The rate of the process is changed at the specified times. The unit of the instantaneous rate is spikes/s. By default, each target of the generator will receive a different spike train.
All stimulation devices share the parameters
which control the stimulation period. The property
origin is a
global offset that shifts the stimulation period. All three values are
set as times in ms.
For spike-emitting devices, only spikes with times t that fulfill start < t <= stop are emitted. Spikes that have timestamp of t = start are not emitted.
For current-emitting devices, the current is activated and deactivated such that the current first affects the target dynamics during the update step (start, start+h], i.e., an effect can be recorded at the earliest at time start+h. The last interval during which the current affects the target’s dynamics is (stop-h, stop].
stimulus_source defaults to an empty string. It can
be set to the name of a stimulation backend, in which case it will
take its parameters from the configured backend instead of from the
internally stored values. More details on available backends and their
properties can be found in the guide to stimulating the network.
A string (default: “”) specifying an arbitrary textual label for the device. Stimulation backends might use the label to generate device specific identifiers like filenames and such.
A positive floating point number (default : 0.0) used as the reference time in ms for start and stop.
A positive floating point number (default: 0.0) specifying the activation time in ms, relative to origin.
A string (default: “”) specifying the name of the stimulation backend from which to get the data for updating the stimulus parameters of the device. By default the device uses its internally stored parameters for updating the stimulus.
A floating point number (default: infinity) specifying the deactivation time in ms, relative to origin. The value of stop must be greater than or equal to start.
Times at which rate changes (list of ms)
Rate of Poisson spike train (list of spikes/s)
If false, spike times will be rounded to the nearest step if they are less than tic/2 from the step, otherwise NEST reports an error. If true, spike times are rounded to the nearest step if within tic/2 from the step, otherwise they are rounded up to the end of the step. Default: false
Set parameters from a stimulation backend¶
The parameters in this stimulation device can be updated with input coming from a stimulation backend. The data structure used for the update holds one value for each of the parameters mentioned above. The indexing is as follows: