[Eeglablist] Filter causality pop_eegfiltnew

[Vito De Feo]

Before using the Cleanline (that I used today for the first time) I did't use the notch filter, I used a multi taper filtering made by Anil Seth. I know that filtering is very bad for later VAR modeling, especially notch and high pass. Low pass is better (usually I use multi taper filtering to remove the noise lines and a low pass causal filter with cut off filtering of 100 Hz).
Do you think is ok Tim?
Best
Vito 


Il giorno 17/gen/2014, alle ore 20:53, mullen.tim at gmail.com ha scritto:

> Do not notch filter your data! This can be very bad for later VAR modeling -- and IMO bad in general. You can use an adaptive spectral regression method such as that in the Cleanline plugin for eeglab to remove line noise.
> 
> See Barnett and Seth 2011 and Mitra and Pesaran 1999 for theoretical discussions. 
> 
> Rob, there is no video of the SIFT workshop but the lecture pdfs are online at the eeglab workshop page. 
> 
> Tim 
> -----Original Message-----
> Date: Friday, January 17, 2014 10:18:32 am
> To: "robert coben" <drcoben at gmail.com>,"mmiyakoshi at ucsd.edu" <mmiyakoshi at ucsd.edu>
> Cc: Andreas Widmann <widmann at uni-leipzig.de>, EEGLAB List <eeglablist at sccn.ucsd.edu>
> From: "Gabriele Trotta" <trotta_gabriele at yahoo.com>
> Subject: Re: [Eeglablist] Filter causality pop_eegfiltnew
> 
> Dear Vito,
> in general, the 50Hz frequency can be removed by means of a Notch filter
> in the pre-processing stage. Matlab easily implement such a filter!
> 
> 
> http://www.mathworks.com/matlabcentral/newsreader/view_thread/292960
> 
> 
> 
> 
> Il Venerdì 17 Gennaio 2014 5:24, robert coben <drcoben at gmail.com> ha scritto:
> 
> 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; chec
> 
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