Isn't the brain randomly stimulated already? Even not being dead? Don't you think the complex reasoning is a cause of the neurons themselves and not the stimulation?
Animals are alive and are not nearly as smart. Its because their neural networks are not as deep. Its not for the lack of proper chemistry or stimulation.
Maybe we've just reach the ability the replicate the function of an artificially powered dead brain that would be randomly stimulated and nothing more. Is this really a path to intelligence ?