This nOde last
updated January 12th, 2003 and is permanently morphing...
(13 Muluc (Water)
/ 2 Muwan (Owl) - 169/260 - 126.96.36.199.9)
In 1964, the psychologist
Roger N. Shepard published a paper entitled _Circularity in Judgements
of Relative Pitch_ in the _Journal of the Acoustical Society of America_.
It described the set of tones reproduced here. These tones were crafted
by Shepard to eliminate all relative pitch discrimination information.
As a result, when played in sequence, each tone sounds higher than all
tones preceding it and lower than all tones following it (and vice versa
when the sequence is played in the opposite order). Since there are only
twelve tones in the sequence, played in a continuous loop,
every tone sounds both higher and lower than every other at some point
in the sequence.
techno track _The Shepard
Project_ MP3 (192k)
by Asem Shama
welcome to the shepard project
well what is happening?
let us begin with the two
features which that our brain uses to perceive
this illusion of sensitivity to descending pitch and volume changes between
these pitches the tones increase in pitch gradually rising higher until
they increase to double their original frequency
then they come back down
to their original pitch, then repeat the cycle. the key is that when
the tone finishes rising in pitch, its volume matches that of the next
tone above it.. since the volume changes occur gradually, and over
a wide spectrum of sound, the effect is a seamless transition in the cycle.
the result is indeed all
within your head
_Eclipse - A Shephard's Warning_ compilation CD
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Monkey feat. Angele - _Moonchild_
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- Woob - _Giant Stroke_
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Loons - _Lune Solaire_ MP3 (192k)
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