1. An implantable apparatus for delivering electrical stimuli to a neural network of an implantee, the apparatus comprising: a stimulator that generates stimulation signals; and at least one electrode member for receiving the stimulation signals and for delivering the stimuli to the neural network in response to said signals; wherein the stimuli includes plasticity informative stimuli having a magnitude below a perception threshold of the implantee, the plasticity informative stimuli facilitating the production and/or release of naturally occurring agents into the neural network to influence the functionality thereof.