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Re: Q: Shifts in perceived time with spectral changes?

>Was wondering if anyone knew of some research / evil experiments
>dealing with perceived time stretching/condensing with certain
>patterns of sounds with differing spectra? More specifically, I
>am interested in any local-micro-tempo-curve deviations that
>might be experienced with various percussive sounds.
>For instance, if we play a standard Ump-Sss-Ump-Sss-Ump-Sss
>disco beat at some poor devil, do they feel any temporal attraction
>between the Sss-Ump as opposed to the Ump-Sss?
>(assuming perfect sequencer time here.)

Long time ago, I did my thesis work on the question of whether melodic context had an influence on the perception of thythmic regularity. The basic paradigm consisted of a three-tone "micro-melody" in which the first two tones had one frequency and the last another. The basic result was that, yes, context did have an effect, with better regularity discrimination when the frequencies were close to one another (=streaming-like effect) or when the frequency ratio corresponded to a "dissonant", rather than a "consonant" (=M3, p4, p8) musical interval. If you have a good libray, you may be able to find this work published as a monograph in a now-defunct series -- the reference is given below.


Divenyi, P. L.  (1971).  The rhythmic perception of micromelodies: Detectability by human observers of a time increment between sinusoidal pulses of two different, successive frequencies.  In E. Gordon (Ed.), University of Iowa Studies in the Psychology of Music, Vol. VII., (pp. 41-130).  Iowa City: The University of Iowa Press.