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This is a great website http://freevideolectures.com/ all i can say. It has very good collection of video lectures and animations on Physics, Chemistry, Mathematics, biology, electronics, Computer Science, Mechanical, Aerospace Engg, Networking, health sciences and many more.......

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Auditory Illusion

Written by lr-jono on

From: www.e-clecticism.com

I read about an interesting auditory illusion this morning on Mind Hacks. According to Wikipedia this is an example of a Shepard Scale.

A Shepard tone, named after Roger Shepard, is a sound consisting of a superposition of sine waves separated by octaves. When played with the base pitch of the tone moving upwards or downwards, it is referred to as the Shepard scale. This creates the auditory illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower.

Here is an example from YouTube, which you just need to listen to and then replay. Here is a link to the original article.

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