[Eeglablist] Filter causality pop_eegfiltnew

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Jan 16 08:49:10 PST 2014


Dear Rob,

Yes check this out.

http://sccn.ucsd.edu/wiki/EEGLAB_2013_UCSD

Makoto


2014/1/16 robert coben <drcoben at gmail.com>

> Is Tim’s workshop available online?
>
> thx
>
> Rob
>
> On Jan 15, 2014, at 6:04 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>
> Dear Vito,
>
> > the acausal filtering destroy the causality flow. For Granger it is
> important to use only causal filter.
>
> Oh really. That sounds counterintuitive to me. Please send me the URL to
> the paper about it.
>
> However let me tell you this that Tim Mullen (the author of SIFT) told us
> in the past EEGLAB workshop that we should not use ANY filter for SIFT. If
> you want to remove low-frequency drifts etc... he recommended the detrend
> option supported in SIFT. For low-pass filter, he said don't use it. Also
> make sure that you use double precision, not signle precision; check EEGLAB
> option to switch it (default should be single precision). Actually these
> were new things I learned!
>
> Condro, for clarification to novice users, let me add this that EEGLAB's
> FIR filter is by default non-causal (i.e. peak latencies do not shift).
>
> Makoto
>
> 2014/1/15 Vito de Feo <vito.defeo at zmnh.uni-hamburg.de>
>
>>  Dear Makoto,
>>
>> the acausal filtering destroy the causality flow. For Granger it is
>> important to use only causal filter. If you are interested I can send you a
>> paper about that.
>>
>> Yes, I know SIFT and I am also using it for my analisys.
>>
>>
>> Vito
>>
>> Quoting Makoto Miyakoshi <mmiyakoshi at ucsd.edu>:
>>
>>  Dear Andreas and Vito,
>>
>>  Sorry Andreas I screwed it when I typed your name.
>>
>>  Vito, I would like to learn from you the reason why you want to use the
>> minimum phase filter for Granger causality analysis. By the way, you know
>> SIFT is available for it? In case you don't know it yet, check out
>> http://sccn.ucsd.edu/wiki/SIFT.
>>
>>  Makoto
>>
>>
>> 2014/1/14 Vito de Feo <vito.defeo at zmnh.uni-hamburg.de>
>>
>>> Dear Andreas,
>>>
>>> I download the last version (13.1.1) and now the option is present and
>>> it is clearly written that the default is the zero-phase linear filtering.
>>>
>>> In my previous version (the last of the EEGLAB 12) this option was not
>>> present but now, with the version 13, it is present again!
>>>
>>> Best,
>>>
>>> Vito
>>>
>>>
>>> Quoting Andreas Widmann <widmann at uni-leipzig.de>:
>>>
>>> Dear Vito,
>>>>
>>>> in the last eeglab version there is not the minphase parameter in the
>>>>> pop_eegfiltnew function.
>>>>
>>>> Which version is your last version? In 13.1.1 from the web page and in
>>>> rev 10261 from SVN the option is present. It was initially introduced in
>>>> EEGLAB 13 (but not backported to EEGLAB 12). Could you please check whether
>>>> possibly something went wrong with your setup/path and report back your
>>>> version number?
>>>>
>>>> It was useful to force the filter to be causal. If I have understand
>>>>> well now the filter is causal by dafault because it uses the filter
>>>>> funcion. Is this correct?
>>>>
>>>> NO! Causal non-linear filter is NOT the default. Default is and will
>>>> remain zero-phase linear filtering. Default filter functions did not change
>>>> since EEGLAB 12.
>>>>
>>>> Best,
>>>> Andreas
>>>>
>>>> Sorry if this is a vey well known issue but I didn't find any answer on
>>>>> the web until now.
>>>>> I need filter causality for Granger analisys. If anyone has also other
>>>>> suggestion about causal filtering with eeglab, any suggestion is very
>>>>> welcome!
>>>>>
>>>>> Thank in advange!
>>>>>
>>>>> Vito
>>>>>
>>>>>
>>>>>
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>>>>> ______________________________
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>>>
>>>
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>>>
>>>
>>>
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>>>
>>>
>>>
>>> *-- Pflichtangaben gemäß Gesetz über elektronische Handelsregister und
>>> Genossenschaftsregister sowie das Unternehmensregister (EHUG):
>>> Universitätsklinikum Hamburg-Eppendorf Körperschaft des öffentlichen Rechts
>>> Gerichtsstand: Hamburg Vorstandsmitglieder: Prof. Dr. Christian Gerloff
>>> (Vertreter des Vorsitzenden) Prof. Dr. Dr. Uwe Koch-Gromus Joachim Prölß
>>> Rainer Schoppik*
>>>
>>
>>
>>
>> *-- *
>>
>>
>> *Makoto Miyakoshi Swartz Center for Computational Neuroscience Institute
>> for Neural Computation, University of California San Diego*
>>
>>
>>
>>
>>
>> --
>> Pflichtangaben gemäß Gesetz über elektronische Handelsregister und
>> Genossenschaftsregister sowie das Unternehmensregister (EHUG):
>>
>> Universitätsklinikum Hamburg-Eppendorf
>> Körperschaft des öffentlichen Rechts
>> Gerichtsstand: Hamburg
>>
>> Vorstandsmitglieder:
>> Prof. Dr. Christian Gerloff (Vertreter des Vorsitzenden)
>> Prof. Dr. Dr. Uwe Koch-Gromus
>> Joachim Prölß
>> Rainer Schoppik
>>
>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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