the invention is a method of automatically adjusting an electrode array to the neural characteristics of an individual patient . the perceptual response to electrical neural stimulation varies from patient to patient and the response to electrical neural stimulation varies from patient to patient and the relationship between current and perceived brightness is often non - linear . it is necessary to determine this relationship to fit the prosthesis settings for each patient . it is advantageous to map the perceptual responses to stimuli . the method of mapping of the present invention is to provide a plurality of stimuli that vary in current , voltage , pulse duration , frequency , or some other dimension ; measuring and recording the response to those stimuli ; deriving a formula or equation describing the map from the individual points ; storing the formula ; and using that formula to map future stimulation .