Jump to content
Sign in to follow this  

Glissando illusion

Recommended Posts

The Glissando Illusion was discovered and first published by Deutsch on the CD Musical Illusions and Paradoxes, 19951.


As in other stereo illusions described in this section, this shows how a cue that generally helps us to perceive our environment correctly can instead lead to perceptions that are wildly wrong. It also shows that a simple sound pattern can be perceived by different people in strikingly different ways.


it is created when a sound with a fixed pitch, such as a synthesized oboe tone, is played together with a sine wave gliding up and down in pitch, and they are both switched back and forth between stereo loudspeakers.


The effect is that the oboe is heard as switching between loudspeakers while the sine wave is heard as joined together seamlessly, and as moving around in space in accordance with its pitch motion. Right-handers often hear the glissando as traveling from left to right as its pitch glides from low to high, and then back from right to left as its pitch glides from high to low. Left-handers often obtain different illusion


To experience the Glissando Illusion, you should be seated in front of two stereo  loudspeakers, with one to your left and the other to your right, as in Figure 1. The effect is strongest when the room is somewhat reverberant, such as an auditorium. (Listening through headphones does not produce as good an illusion.)



Glissando illusion example 


Your browser does not support this audio format.


Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...