7. The computerized adaptive method as recited in claim 6 further comprising: e) presenting a plurality of skill levels to the user, each one of the skill levels increasing in difficulty from said first skill level of approximately 150% stretching and 20 dB emphasis to a most difficult skill level having no stretching and no emphasis.
7. The computerized adaptive method as recited in claim 6 further comprising: e) presenting a plurality of skill levels to the user, each one of the skill levels increasing in difficulty from said first skill level of approximately 150% stretching and 20 dB emphasis to a most difficult skill level having no stretching and no emphasis. 8. The computerized adaptive method as recited in claim 7 further comprising: f) increasing the skill level presented to the user if the user correctly discriminates between the modified acoustic events by sequentially selecting the two different graphical images from among the plurality of graphical images, a predetermined number of times.