[FieldTrip] Data prewhitening

[Eelke Spaak]

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
>>
>
>
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>
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>
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