Has anyone used any NEST Synapse Models to create Gamma Rhythms during a simulation with the NEST Izhikevich Neuron model?  

  My simulation, which uses the Stdp-Synapse model (additive type) does not appear to be converging into gamma rhythms (w/bi-model wt distribution) using super-threshold poisson point process (ref: Polychronization Computation With Spikes (Izhikevich, 2006), 

DOI: 10.1162/089976606775093882)

  Thanks for any suggestions,

Best Regards,

--Allen