[FieldTrip] Data prewhitening

David Groppe david.m.groppe at gmail.com
Fri Sep 14 14:54:23 CEST 2012


Here's a reference for whitening:

Applications of spectral methods in functional brain imaging. D.
Kleinfeld and P. P. Mitra. In Imaging: A Laboratory Manual (Book 1) R.
Yuste, editor and series editor, 2011, Cold Spring Harbor Laboratory
Press, NY, Chapter 12, 143-158.

http://physics.ucsd.edu/neurophysics/publications/12_08_IMG.pdf

And thanks to Robert Oostenveld for that original email response to my
question about removing 1/f power trends.
    -David


On Fri, Sep 14, 2012 at 8:27 AM, Eelke Spaak <eelke.spaak at donders.ru.nl> wrote:
> Hi Andrea,
>
> To add to Roemer's suggestion: it's not exactly a reference perhaps,
> but Robert posted on the list a while ago some explanation behind
> using the temporal derivative to remove 1/f power (=whitening). See
> http://mailman.science.ru.nl/pipermail/fieldtrip/2011-October/004390.html
>
> Best,
> Eelke
>
> On 14 September 2012 14:09, andrea brovelli <andrea.brovelli at univ-amu.fr> wrote:
>> Thank you all for these suggestions, I'll try them out.
>>
>> bye
>>
>> Andrea
>>
>>
>> ----- Message de r.vandermeij at donders.ru.nl ---------
>>     Date : Fri, 14 Sep 2012 13:03:32 +0200
>>      De : Roemer van der Meij <r.vandermeij at donders.ru.nl>
>> Répondre à : FieldTrip discussion list <fieldtrip at science.ru.nl>
>>  Objet : Re: [FieldTrip] Data prewhitening
>>       À : FieldTrip discussion list <fieldtrip at science.ru.nl>
>>
>>
>>> Hi Andrea,
>>>
>>> Are you referring to pre-whitening by removing the first parameter of
>>> an auto-regressive model, thereby removing most (if not all) of the 1/f
>>> shape in the spectrum? If so, this can be done by taking the first
>>> temporal derivative of the raw-data, effectively setting the first AR
>>> parameter to 0. This is implemented by setting cfg.derivative = 'yes' in
>>> preprocessing.
>>> I don't know of any good references for this trick though, so if anybody
>>> else can help out, that'd be great.
>>>
>>> Best,
>>> Roemer
>>>
>>>
>>> On Fri, Sep 14, 2012 at 12:27 PM, andrea brovelli <
>>> andrea.brovelli at univ-amu.fr> wrote:
>>>
>>>> Dear all,
>>>>
>>>> I was wondering whether we can whiten the data using the cfg options in
>>>> the ft_preprocessing function. Does anyone know ?
>>>>
>>>> Or does anyone have some code for prewhitening raw data ?
>>>>
>>>> Thanks a lot
>>>>
>>>> Andrea
>>>>
>>>>
>>>> ______________________________**_________________
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>>>>
>>>
>>>
>>>
>>> --
>>> Roemer van der Meij M.Sc.
>>> PhD student
>>> Donders Institute for Brain, Cognition and Behaviour
>>> Centre for Cognition
>>> P.O. Box 9104
>>> 6500 HE Nijmegen
>>> The Netherlands
>>> Tel: +31(0)24 3655932
>>> E-mail: r.vandermeij at donders.ru.nl
>>>
>>
>>
>> ----- Fin du message de r.vandermeij at donders.ru.nl -----
>>
>>
>>
>> --
>>
>>   NEW EMAIL: andrea.brovelli at univ-amu.fr
>>
>>
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-- 
David Groppe, Ph.D.
Postdoctoral Researcher
North Shore LIJ Health System
New Hyde Park, New York
http://www.cogsci.ucsd.edu/~dgroppe/




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