Play Sound File : Deutsch's Scale Illusion
This is a stereo sound file
This is the Deutsch's Scale Illusion. To get a good stereo effect for this illusion, use stereo headphones with the loudspeakers turned off. If you hear higher tones in one ear and lower tones in the other ear, decide which ear is hearing the higher tones. Then reverse the earphones while the pattern is playing, and decide again which ear is hearing the higher tones. Most righthanders hear the higher tones on the right and the lower tones on the left, regardless of how the earphones are positioned. Lefthanders and ambidextrous people are more varied in terms of where the higher and lower tones appear to be located.
This audio example is presented here in .MP3 format.Play Deutsch's Scale_Illusion (.75 Mbytes) The next sound file presents the Scale illusion first with the 2 channels in balance then with one channel alone, then the other channel alone, then the 2 channels in balance again. Notice that the melodies reorganize themselves perceptually when the 2 channels are played together.
Play the illusion with each channel alone (.95 MBytes)
When listening to this sound file, it is best to use equipment with a flat frequency response, so as to avoid spectral distortion. Features that alter the signal in any way, such as spatialization features, should be turned off. Compression algorithms should be avoided, in particular for the stereo illusions. And make sure that the playback amplitude is not too high.
See the Technical Notes for more information.
© Diana Deutsch For more information : http://philomel.com