This is a stereo sound file
Listen using external speakers
To experience the Glissando Illusion, it is best to be seated in front of two stereophonically separated loudspeakers, with one to your left and the other to your right, as in the diagram. (Avoid using headphones.) Set the sound level so that it is on the soft side, and make sure that the channels are in balance.
Play Deutsch's Glissando Illusion
Play Deutsch's Glissando_Illusion
Now here is the pattern that produces Deutsch's Glissando_Illusion, presenting only the channel to the right.
Play only the channel to the right
Now here is the pattern that produces Deutsch's Glissando_Illusion, presenting only the channel to the left.
Play Deutsch's Glissando_Illusion presenting only the channel to the left
Finally, here is Deutsch's Glissando_Illusion, presented first with the two channels together, then with each channel separately, and then with the two channels together again. Notice that when the two channels are presented together, the melodies reorganize themselves perceptually.
Play Deutsch's Glissando_Illusion with each channel played alone for a short time
Technical Listening Note
See the Technical Listening Notes for more information.