1. A computerized adaptive method for improving a users audible discrimination, the method comprising: a) displaying a plurality of graphical images, the graphical images associated with acoustic events that are modified by stretching in the time domain; b) associating in pairs the plurality of graphical images with particular modified acoustic events such that two different graphical images are associated with a particular modified acoustic event; c) upon selection of any of the plurality of graphical images, presenting its associated modified acoustic event; and d) requiring the user to discriminate between the modified acoustic events by sequentially selecting the two different graphical images from among the plurality of graphical images, that are associated with the particular modified acoustic event.