Current source models

There is a number of predefined models which can be used with the NNmodel::addCurrentSource function:

• CurrentSourceModels::DC
• CurrentSourceModels::GaussianNoise

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. For convenience the methods this class should implement can be implemented using macros:

• DECLARE_MODEL(TYPE, NUM_PARAMS, NUM_VARS), SET_DERIVED_PARAMS(), SET_PARAM_NAMES(), SET_VARS() perform the same roles as they do in the neuron models discussed in Defining your own neuron type.
• SET_INJECTION_CODE(INJECTION_CODE): 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:

class UniformNoise : public CurrentSourceModels::Base
{
public:
    DECLARE_MODEL(UniformNoise, 1, 0);
    
    SET_SIM_CODE("$(injectCurrent, $(gennrand_uniform) * $(magnitude));");
    
    SET_PARAM_NAMES({"magnitude"});
};

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