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page_sectCurrentSourceModels.rst

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pair: page; Current source models

Current source models

There is a number of predefined models which can be used with the ModelSpec::addCurrentSource <doxid-da/dfd/classModelSpec_1aaf260ae8ffd52473b61a27974867c3e3> function:

  • CurrentSourceModels::DC <doxid-d7/da1/classCurrentSourceModels_1_1DC>
  • CurrentSourceModels::GaussianNoise <doxid-d0/d7d/classCurrentSourceModels_1_1GaussianNoise>

Defining your own current source model

In order to define a new current source type for use in a GeNN application, it is necessary to define a new class derived from CurrentSourceModels::Base <doxid-d0/de0/classCurrentSourceModels_1_1Base>. For convenience the methods this class should implement can be implemented using macros:

  • DECLARE_MODEL(TYPE, NUM_PARAMS, NUM_VARS) <doxid-d4/d13/models_8h_1ae0c817e85c196f39cf62d608883cda13>, SET_DERIVED_PARAMS() <doxid-de/d6c/snippet_8h_1aa592bfe3ce05ffc19a8f21d8482add6b>, SET_PARAM_NAMES() <doxid-de/d6c/snippet_8h_1a75315265035fd71c5b5f7d7f449edbd7>, SET_VARS() <doxid-d4/d13/models_8h_1a3025b9fc844fccdf8cc2b51ef4a6e0aa> perform the same roles as they do in the neuron models discussed in Defining your own neuron type <doxid-de/ded/sectNeuronModels_1sect_own>.
  • SET_INJECTION_CODE(INJECTION_CODE) <doxid-da/d49/currentSourceModels_8h_1adf53ca7b56294cfcca6f22ddfd1daf4f> : where INJECTION_CODE contains the code for injecting current into the neuron every simulation timestep. The $(injectCurrent, ) function is used to inject current.

For example, using these macros, we can define a uniformly distributed noisy current source:

cpp

class UniformNoise : public CurrentSourceModels::Base <doxid-d0/de0/classCurrentSourceModels_1_1Base> { public: DECLARE_MODEL <doxid-d4/d13/models_8h_1ae0c817e85c196f39cf62d608883cda13>(UniformNoise, 1, 0);

SET_SIM_CODE <doxid-d3/dc0/neuronModels_8h_1a8d014c818d8ee68f3a16838dcd4f030f>("$(injectCurrent, $(gennrand_uniform) * $(magnitude));");

SET_PARAM_NAMES <doxid-de/d6c/snippet_8h_1a75315265035fd71c5b5f7d7f449edbd7>({"magnitude"});

};

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