Command: testsuite::test_iaf_1to2

Synopsis

(test_iaf_1to2) run -> compare response with reference data

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.

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.

File

testsuite/unittests/test_iaf_1to2_default_delay.sli

Author

July 2004
Diesmann