# Command: testsuite::test_iaf_1to2

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Name:

    testsuite::test_iaf_1to2 - sli script for test of iaf_neuron spike interaction

Synopsis:

    (test_iaf_1to2) run -> compare response with reference data

Description:

      test_iaf_1to2 checks the spike interaction of two iaf_neuron model
      neurons.

      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.

      A DC current in the pre-synaptic neuron is adjusted to cause a spike
      at a grid position (t=3.0 ms) joined by all computation step sizes to
      be tested.

      Note that in a neuron model where synaptic events are modeled by a
      truncated exponential the effect of the incoming spike would be
      visible at the time of impact (here, t=4.0 ms). This is because the
      initial condition for the post-synaptic potential (PSP) has a
      non-zero voltage component. For PSPs with finite rise time the
      situation is different. In this case the voltage component of the
      initial condition is zero (see documentation of
      test_iaf_psp). Therefore, at the time of impact the PSP is only
      visible in other components of the state vector.

      The expected output is documented and briefly commented at the end of
      the script.

      Author:  July 2004, Diesmann

SeeAlso:

- testsuite::test_iaf
- testsuite::test_iaf_psp
- testsuite::test_iaf_dc_aligned_delay

Source:

    /opt/conda/conda-bld/nest_1510213973486/work/nest-2.14.0/testsuite/unittests/test_iaf_1to2_default_delay.sli

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