When trying to reproduce Izhikevich's Simple Neuron Model with NEST Izhikevich Neuron Model, it is spiking before reaching my V_th potential threshold setting of 30 mV, producing results inconsistent with the publication.

  Would anybody have insight as to why the neuron is spiking early?  Did I perhaps not include a relevant NEST setting?

  I compared it to an explicit implementation of the ODEs, attached, for your reference of expected neuron response.

  Thank you for any suggestions.

Best Regards,

--Allen