One of the most intensively used paradigm for studying simultaneous sound segregation is the identification of double vowels. The most important result discussed in Chapter 6 of the book is the finding that the introduction of a difference in the pitch of the two vowels improves their identification.
Here is a demonstration of double vowels. The vowels illustrated here are the japanese vowels used by de Cheveigné and colleagues in a series of studies discussed in the book. The software used to generate these vowels was supplied by Alain de Cheveigné.
You can start and stop the sound with the 'Start' button at the bottom. You select the pair of vowels by pressing the button at the intersection of the appropriate row and column (buttons on the diagonal result in the presentation of the same vowel). You can change the pitch of the column vowel.
The two vowels, and the pitch difference between them, expressed in semitones, are marked on the button while the sound is playing.