  It has been hypothesized that Gamma cortical oscillations play important
roles in numerous cognitive processes and may involve psychiatric conditions
including anxiety, schizophrenia, and autism. Gamma rhythms are commonly
observed in many brain regions during both waking and sleep states, yet their
functions and mechanisms remain a matter of debate. Spatiotemporal Gamma
oscillations can explain neuronal representation, computation, and the shaping
of communication among cortical neurons, even neurological and neuropsychiatric
disorders in neo-cortex. In this study, the neural network dynamics and
spatiotemporal behavior in the cerebral cortex are examined during Gamma brain
activity. We have directly observed the Gamma oscillations on visual processing
as spatiotemporal waves induced by targeted optogenetics stimulation. We have
experimentally demonstrated the constant optogenetics stimulation based on the
ChR2 opsin under the control of the CaMKII{\alpha} promotor, which can induce
sustained narrowband Gamma oscillations in the visual cortex of rats during
their comatose states. The injections of the viral vector [LentiVirus
CaMKII{\alpha} ChR2] was performed at two different depths, 200 and 500 \mu m.
Finally, we computationally analyze our results via Wilson-Cowan model.
