Words consist of more than one phoneme by transitions .
Thus there are 3 information bearing elements in audition. Thus a more suitable model may involve mechanisms similar to those proposed for the bat in which neurons are specialized to respond more on the basis of the presence of absence of certain transient components rather than on the basis of a unique vocalization. So we study the bat. Recall that there are multiple maps of frequency with lots of recombination. To process species specific sounds, the IBE's must be reanalyzed by cortex.