Re: f0 frequency difference limen

[Andrew Milne <andymilne@xxxxxxxxxxxxxx>]

Hi Matt,

----- Original Message ----- 
From: "Matt Flax" <flatmax@xxxxxxxx>
To: <AUDITORY@xxxxxxxxxxxxxxx>
Sent: Tuesday, January 13, 2009 3:46 PM
Subject: Re: f0 frequency difference limen


> Hi Andrew,
> 
> I was just chatting with some people the other day about frequency limen 
> ...
> 
> Are you talking about harmonic instruments ?

Yes, I'm principally interested in instruments with harmonic spectra.

> Then you can use combinations of even & odd multiples of f0. If you want 
> to know their nature, I guess it would be dependent on the type of your 
> instrument and how loud it is being played.

I'm not sure how that would work. Essentially I am looking for a ballpark figure that would represent the sort of 
frequency difference between two "musical tones" that would give a 75% correct hit rate in a 2AFC.

And let us assume that the pitches have a reasonable duration - i.e. at least 200ms.

Thanks

Andrew

> 
> If you are talking about the frequency difference limen associated with 
> the active processes of hearing ... I am aware of more basic - yet 
> revealing phenomena - to do with the live Cochlea, SOAEs and (in my 
> opinion) the SOC.
> 
> Here is a recent reference and my opinion for you ...
> 
> An investigation into the frequency difference limens D_L near SOAE 
> frequencies suggests that they are reduced around the SOAE frequency 
> [norena:2002]. They were found to be reduced whether the stimulus was 
> ipsilaterally or contralaterally presented. Norena et al. argue that the 
> effect on D_L with contralateral presentation suggests a central role 
> for the frequency processing and SOAE generation mechanism of the 
> peripheral hearing circuit.
> 
> I do have more information on the harmonics (and non harmonics) present 
> in compression driven cochlear sections, however that is a start.
> 
> Matt
> 
> [norena:2002] @ARTICLE{norena:2002,
>  author = {Norena, A. and Micheyl, C. and Durrant, JD and Chery-Croze, 
> S. and
> Collet, L.},
>  title = {{Perceptual correlates of neural plasticity related to 
> spontaneous
> otoacoustic emissions?}},
>  journal = {Hearing Research},
>  year = {2002},
>  volume = {171},
>  pages = {66--71},
>  number = {1},
>  publisher = {Elsevier Science}
> }
> 
> On Tue, 2009-01-13 at 10:24 +0000, Andrew Milne wrote:
> Dear members of the list,
>> 
>> Is there a consensus on the size of the frequency difference limen for 
> the f0 of complex tones such as those 
>> produced by musical instruments - i.e. containing both resolved and 
> unresolved harmonics. References to papers 
>> describing the precise nature of the tests used would also be helpful.
>> 
>> Many thanks
>> 
>> Andrew Milne
>> 
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> 
> On Tue, Jan 13, 2009 at 10:24:39AM +0000, Andrew Milne wrote:
>> Dear members of the list,
>> 
>> Is there a consensus on the size of the frequency difference limen for the f0 of complex tones such as those 
>> produced by musical instruments - i.e. containing both resolved and unresolved harmonics. References to papers 
>> describing the precise nature of the tests used would also be helpful.
>> 
>> Many thanks
>> 
>> Andrew Milne
>> 
>> -------------------------------------------------
>> Visit Pipex Business: The homepage for UK Small Businesses
>> 
>> Go to http://www.pipex.co.uk/business-services
> 
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