1. A method of teaching self-regulation to a human subject of said subjects various physiological functions comprising the steps of; (a) detecting a signal from said subject of a physiological function sought to be regulated (b) digitizing said signal to provide a plurality of digitized signals overtime (c) electronically deteriming a plurality of values, each value functionally related to a number of said digitized signals (d) automatically determining a first statistical function of said digitized signals indicating whether said subject could adequately resolve the display of said values within scaling limits extending from an upper limit to a lower limit of a metric (e) determining second statistical function of said digitized signals indicating whether said values will continue to fall within said scaling limits of said metric (f) determining said scaling limits of said metric as a function of said first statistical function said second statistical function; and (g) displaying simultaneously said metric, its scaling limits, and said values to induce said subject to control said physiological function.