Transmitter types in Auryn determine on which neuronal or synaptic variable a synaptic event has an effect. The following types are currently implemented in auryn_definitions.h (see also the code of Connection):
GLUT: target glutamatergic receptors at destination neuron
GABA: target gabaergic receptors at destination neuron
AMPA: target AMPA receptors only at receiving neuron
NMDA: target NMDA receptors only at receiving neuron
MEM: target the membrane voltage directly (for instance to implement current-based synapse models)
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