Re: harmonic extraction

[Al Bregman <al.bregman@xxxxxxxxx>]

On Thu, Mar 26, 2009 at 9:58 AM, David Smith <smithd@xxxxxxxx> wrote:

> Given the stimuli, I think you would be hard pressed to find a mechanical
> system,
> the atmosphere and ear included, which did not exhibit response at 200Hz.


Dear David,

Please expand on this.  It's not clear how you intend this to explain
Jim Bashford's observations.

-  Al
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> ----- Original Message -----
> From: "Al Bregman"
> To: AUDITORY@xxxxxxxxxxxxxxx
> Subject: Re: [AUDITORY] harmonic extraction
> Date: Wed, 25 Mar 2009 12:46:37 -0400
>
>
> Dear James,
>
> This example of duplex perception, outside the domain of speech, and
> clearly not involving two distinct mental "modules", is very
> interesting, throws a different light on duplex perception of speech,
> and is certainly worth further development and publication..
>
> Best,
> Al
> -------------------------------------------------------------------
> Albert S. Bregman, Emeritus Professor
> Psychology Department, McGill University
> 1205 Docteur Penfield Avenue
> Montreal, QC, Canada H3A 1B1.
> Office: Phone: (514) 398-6103
> Fax: (514) 398-4896
> Residence phone & fax: (514) 484-2592
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>
> On Wed, Mar 25, 2009 at 10:35 AM, James Bashford wrote:
>> Dear Xueliang Zhang,
>>
>>    I was intrigued by the interchange between you, Yoshitaka Nakajima, and
>> Al Bregman, and did some listening, diotically through headphones, to
>> stimuli consisting of the first 10 harmonics of 100 Hz alternating with
>> the
>> 5 even harmonics of that stimulus (all harmonics were presented at the
>> same
>> level).  With on/off times for each complex matched at either 0.5 sec or
>> 1.0
>> sec (10 ms rise/fall), I hear a fully continous 200-Hz tone that matches
>> the
>> intensity and timbre of the isolated even-harmonic complex.  More
>> interesting, however, is that the 10-component “all-harmonic” stimulus,
>> which is heard intermittently, has not only the 100-Hz pitch of that
>> complex
>> but also retains the loudness and timbre of the all-harmonic stimulus as
>> heard when it is presented in isolation.  Were the even harmonics of the
>> all-harmonic complex exclusively allocated to support perception of the
>> continuous 200-Hz complex tone -- leaving only the odd-harmonics to
>> support
>> perception of the 100 Hz tone -- we would expect both a reduction in
>> loudness and a clear shift in timbre to the “hollow” quality
>> characteristic
>> of odd-harmonic signals.  This suggests that the “priming” or “capture”
>> effect observed with complex tones provides an example of duplex
>> perception
>> that requires neither a verbal stimulus nor dichotic presentation.  As I
>> recall, Al Bregman has previously suggested that such an effect might
>> occur
>> when nonverbal stimulus input is strongly ambiguous.
>>
>>       This use of the even-harmonic components to support two simultaneous
>> percepts (that of both the intermittent “all-harmonic” tone and the
>> continuous even-harmonic tone) contrasts sharply with the processing
>> underlying the general phenomenon of illusory continuity that is observed
>> when one sound alternates with a higher-intensity, potential masking
>> sound.  The latter effect, which has been called auditory induction
>> (Warren,
>> 1972), occurs with a wide variety of signals, such as tones alternating
>> with
>> other tones, noise alternating with higher intensity noise, or speech
>> interrupted by noise (phonemic restoration).  This type of continuity, in
>> which there are no exactly matching components to be found between the
>> alternating signals, does appear to involve subtractive or exclusive
>> allocation.  For interrupted tones, noise, or speech, continuity is
>> obtained
>> at the expense of the interrupting signal, which is reduced in loudness by
>> an amount proportional to the extent the illusion (Warren et al., 1994).
>>
>> Warren, R. M., Obusek, C. and Ackroff, J. M. (1972). Auditory induction:
>> Perceptual synthesis of absent sounds. Science, 176, 1149-1151.
>>
>> Warren, R. M., Bashford, J. A., Jr., Healy, E. W., and Brubaker, B. S.
>> (1994). Auditory induction: Reciprocal changes in alternating sounds.
>> Perception & Psychophysics, 55, 313-322.
>>
>>
>>
>> James Bashford
>>
>> On Mar 19, 2009, at 5:24 AM, xlzhang wrote:
>>
>> Dear list,
>> A pure tone can extract corresponding harmonic from complex sound when
>> appearing alternatively. I wonder if a harmonic sound can do the same job?
>> For example, a complex sound with F0=200Hz appears with a complex sound
>> with F0=100 Hz, can we get a continuous perception for F0=200Hz?
>> Thank you for your answers in advance.
>>
>> Xueliang Zhang
>>
>>
>
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-- 
-------------------------------------------------------------------
Albert S. Bregman, Emeritus Professor
Psychology Department, McGill University
1205 Docteur Penfield Avenue
Montreal, QC, Canada H3A 1B1.
Office:  Phone: (514) 398-6103
              Fax: (514) 398-4896
Residence phone & fax: (514) 484-2592
www.psych.mcgill.ca/labs/auditory/Home.html
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