/*
* test_iaf_i0_refractory.sli
*
* This file is part of NEST.
*
* Copyright (C) 2004 The NEST Initiative
*
* NEST is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* NEST is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with NEST. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* BeginDocumentation
Name: testsuite::test_iaf_i0_refractory - sli script for test of iaf_neuron internal DC current
Synopsis: (test_iaf_i0_refractory) run -> compare cout with comments in file
Description:
test_iaf_i0_refractory.sli is a test of a specific feature of the
iaf_neuron model. It is tested whether the voltage traces of simulations
carried out at different resolutions (computation step sizes) are well
aligned and identical when the neuron recovers from refractoriness.
In grid based simulation a prerequisite is that the spike is reported at
a grid position shared by all the resolutions compared.
Here, we compare resolutions 0.1, 0.2, 0.5, and 1.0 ms. Therefore, the
internal DC current is adjusted such (1450.0 pA) that the spike is
reported at time 3.0 ms, corresponding to computation step 30, 15, 6,
and 3, respectively.
The results are consistent with those of iaf_neuron_ps capable of
handling off-grid spike timing when the interpolation order is set to
0.
The expected output is documented and briefly commented at the end of
the script.
The file is an extended version of test_iaf_i0.sli .
Author: July 2004, Diesmann
SeeAlso: iaf_neuron, testsuite::test_iaf_i0
*/
/unittest (6688) require
/unittest using
% h d, arguments are resolution and voltage trace
/AlignedRecovery
{
<< >> begin
/d Set /h Set
ResetKernel
0 <<
/local_num_threads 1
/resolution h
>> SetStatus
/iaf_neuron Create /neuron Set
neuron << /I_e 1450.0 >> SetStatus
/voltmeter Create /vm Set
vm << /withtime true /to_memory true /time_in_steps true /interval h >> SetStatus
/spike_detector Create /sd Set
sd << /withtime true /to_memory true /time_in_steps true >> SetStatus
vm neuron 1.0 h Connect
neuron sd 1.0 h Connect
7 Simulate
% 2. argument, reference voltages
d Transpose First /test_times Set % times of reference
vm [/events [/times /V_m]] get cva % array of recorded voltages
6 ToUnitTestPrecision % to precision of reference
Transpose % all recorded tuples
{First test_times exch MemberQ } Select % those with reference
d eq % compare
end
} def
{
% h d, vector of resolutions and compressed reference data
InflateUnitTestData
Transpose {AlignedRecovery} MapThread
true exch {and} Fold % remove this line to see individual results
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Expected output of this program:
%
% The output send to std::cout is a superposition of the output of
% the voltmeter and the spike detector. Both, voltmeter and spike
% detector are connected to the same neuron.
%
% h= (in ms)
[ 0.1 0.2 0.5 1.0 ]
%
% time voltage
[
% 0 0 0 0 -70 <-- voltage trace. the membrane is at rest
[ 1 -69.4229] % because the current has not yet had the
[ 2 1 -68.8515] % chance to influence the membrane
[ 3 -68.2858] % potential (initial conditions).
[ 4 2 -67.7258]
[ 5 1 -67.1713]
[ 6 3 -66.6223]
[ 7 -66.0788]
[ 8 4 -65.5407]
[ 9 -65.008]
[ 10 5 2 1 -64.4806]
[ 11 -63.9584]
[ 12 6 -63.4414]
[ 13 -62.9295]
[ 14 7 -62.4228]
[ 15 3 -61.9211]
[ 16 8 -61.4243]
[ 17 -60.9326]
[ 18 9 -60.4457]
[ 19 -59.9636]
[ 20 10 4 2 -59.4864]
[ 21 -59.0139]
[ 22 11 -58.5461]
[ 23 -58.0829]
[ 24 12 -57.6244]
[ 25 5 -57.1704]
[ 26 13 -56.721]
[ 27 -56.276]
[ 28 14 -55.8355]
[ 29 -55.3993]
[ 30 15 6 3 -70] % <- The membrane potential crossed threshold in the
% 1 30 15 6 3 <- step 2.9 ms -> 3.0 ms. The membrane potential is
[ 31 -70] % | reset (no super-threshold values can be observed).
[ 32 16 -70] % |
[ 33 -70] % ------ The spike is reported at 3.0 ms
[ 34 17 -70]
[ 35 7 -70]
[ 36 18 -70]
[ 37 -70]
[ 38 19 -70]
[ 39 -70]
[ 40 20 8 4 -70]
[ 41 -70]
[ 42 21 -70]
[ 43 -70]
[ 44 22 -70]
[ 45 9 -70]
[ 46 23 -70]
[ 47 -70]
[ 48 24 -70]
[ 49 -70]
[ 50 25 10 5 -70 ] % <- The last point in time at which the membrane potential
[ 51 -69.4229] % <- is clamped. The fact that the neuron is not refractory
[ 52 26 -68.8515] % | anymore is reflected in the state variable r==0.
[ 53 -68.2858] % | The neuron was refractory for 2.0 ms.
[ 54 27 -67.7258] % |
[ 55 11 -67.1713] % -- The membrane potential starts to increase
[ 56 28 -66.6223] % immediately afterwards (step 5ms -> 5ms + h),
[ 57 -66.0788] % and the neuron can generate spikes again
[ 58 29 -65.5407] % (with time stamp 5ms + h).
[ 59 -65.008 ] % The membrane trace is independent of the resolution.
[ 60 30 12 6 -64.4806]
[ 61 -63.9584]
[ 62 31 -63.4414]
[ 63 -62.9295]
[ 64 32 -62.4228]
[ 65 13 -61.9211]
[ 66 33 -61.4243]
[ 67 -60.9326]
[ 68 34 -60.4457]
[ 69 -59.9636]
]
%
%
rolld assert_or_die