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>Date: Sun, 16 Nov 1997 13:52:49
>From: Mari Jones <email@example.com>
>Subject: Re: Rhythm
>>In Repy to Hartmann's query:
>>More info for Boogie Bob on JND's in rhythms. I agree with Pierre Divenyi
and Devin McAuley (and others): context is all important. Here are just a
few contextual factors that affect temporal JNDs when measured in
"musiclike" contexts: tempo (McAuley, Drake & Botte, Jones & Yee), length
of preceding string of time intervals (Drake and Botte, Schultze), melodic
interval size (van Noorden, Divenyi, Monahan & Hirsh, Jones, Jagacinski et
al. ), the amount of temporal modulation of tempo (in some cases even
remotely preceding an isochronous test region in which time discrimination
is measured] (Drake & Botte, Large & Jones), metric regularity (Jones &
Yee); and in a current experiment here.... polyrhythmic complexity (Barnes &
>>I have probably left out other relevant experiments by many members on
this list and so I apologize (I hope ... probably will...
>>to hear from you)
>>At 08:55 AM 11/19/97 -0500, you wrote:
>>>This is a question about the ability to perceive irregularity in
>>>rhythm. It comes from Boogie Bob, Lansing's foremost rhythm and blues
>>> What is the JND for perceiving an unequal division of a beat into
>>> A quarter note beat could be divided into two eighth notes.
>>> Theoretically, that would be a 50-50 division.
>>> It could be divided into a dotted quarter and a sixteenth.
>>> That would be a 75-25 division, clearly different from 50-50.
>>> Can you distinguish between 75-25 and 67-33? How about 75-25
>>> vs 70-30?
>>>Presumably the answer depends somehow on the tempo. How?
>>>Because this is a question about rhythm and not about the perception of tone
>>>duration, there needs to be a context. Probably it's best to think of a
>>>regular and indefinite repetition of the two-note sequence in question.
>>>That establishes the tempo and context.
>>>Anybody out there with information on this subject?
>>>Next: how about the ability to reliably PRODUCE such a division?
Mari Riess Jones
Department of Psychology
142 Townshend Hall
The Ohio State University, Columbus, Ohio 43210