testsuite::test_iaf_ps_psp_accuracy


Name:
testsuite::test_iaf_ps_psp_accuracy - test of precise integrate-and-fire neurons' accuracy of PSP
Synopsis:
(test_iaf_ps_psp_accuracy) run -> compare one voltage with analytics  

Description:
 

code updated for NEST 2 but not yet this comment

test_iaf_ps_psp_accuracy.sli checks the voltage response of the precise versions of the iaf_psc_alpha
model neurons to a single incoming spike. The voltage excursion is
called post-synaptic potential (PSP). In the model neurons
the post-synaptic current is described by an alpha-function
(see [1] and references therein). The resulting PSP has a finite
rise-time, with voltage and current beeing zero in the initial
condition (see [1]).

The dynamics is tested by connecting a device that emits spikes
at individually configurable times (see test_spike_generator) to
a model neuron.

The weight of the connection specifies the peak value (amplitude)
of the post-synaptic current (PSC) in pA.

The subthreshold dynamics of the model neurons is integrated exactly.
Therefore, it is suitable to check whether the simulation kernel
produces results independent of the computation step size
(resolution).

In order to obtain identical results for different computation
step sizes h, the SLI script needs to be independent of h.
This is achieved by specifying all time parameters in milliseconds
(ms). In particular the time of spike emission and the synaptic
delay need to be integer multiples of the computation step sizes
to be tested. test_iaf_dc_aligned_delay demonstrates the strategy
for the case of DC current input.


References:
 
[1] Rotter S & Diesmann M (1999) Exact simulation of time-invariant linear
systems with applications to neuronal modeling. Biologial Cybernetics
81:381-402.

Author: May 2005, February 2008, Diesmann
SeeAlso: Source:
/home/graber/work-nest/nest-git/nest-simulator/testsuite/unittests/test_iaf_ps_psp_accuracy.sli