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pulse / beat / meter etc
Hmm .. I do not consider this to be an illusion. In my first theory class I will have six students in front of the class 'beating time' to a (simple) Sousa march. http://www.youtube.com/watch?v=xvWLMkxSwIo&feature=related The demonstration is that the division of time (also called rhythm) is multi-dimensional. Underlying patterns / structures are (in western music) found from the levels of pulse, beat-subdivision (grouped pulses), beat (grouped beat-subdivisions), meter (patterned beats), phrase sub-division (collections of metric units), phrase (multiples of phrase sub-divisions), phrase groups ...
In western music, around these frameworks, there are rhythmic elements (melody, accompaniment, figurations etc).
Continuous acceleration / deceleration can be found in the Carter String Quartet No 2 (1959), http://www.youtube.com/watch?v=YC6qTmsAnQI&feature=related and in other pieces after that date. The idea of pulse acceleration is also explored in Kontakte by Stockhausen.
Drummers (and organists) are well-acquainted with this multi-dimemsional aspect of the articulation(s) of time (rhythm) as they will often have to provide two or more levels of the metric structure. Conductors train to be able to move their arms at different tempi (up to about 3:4), and also to count different numbers of beats with each arm (3 beats in the left hand and 4 beats with the right).
Regarding the Risset, and shepard tones, I do not hear continuous descent as I tend not to integrate the tone but stream the multiple octaves, something I am told I cannot do. http://www.youtube.com/watch?v=cUNjbNK5Giw&feature=related
For the beat and other 'illusions' : http://www.youtube.com/watch?v=e6JSTkwXg90&feature=related
This site is based upon the belief that an external reality exists. IMV.
> Date: Tue, 8 Dec 2009 20:17:38 +0100
> From: Leon van Noorden <leonvannoorden@xxxxxxx>
> Subject: auditory illusion
> Dear list,
> For those who are looking for a compelling auditory illusion I can recommend the article by Guy Madison on seemingly perpetually slowing down or speeding up rhythmic patterns.
> The freely accessible paper is located at: http://dx.plos.org/10.1371/journal.pone.0008151
> Leon van Noorden