[Eeglablist] Filtering issues

[Tarik S Bel-Bahar]

Hello Marianne,

searching on google I found the following eeglab
wiki page regarding channel locations. [link below]
The first link on the page accesses the FTP folder
of eeglab channel locations. I logged in as guest,
and noted that in the "eeglab" folder there
were one or two files that had "32" and "easy-cap" in the file name.
You may also want to read though and check
the other resources on the page  Good luck
and please let the list know if/where you successfully
find the channel locations file you seek.
It is also my understanding that Neuroscan support should
can provde these files upon requests.

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



On Fri, Sep 28, 2012 at 1:05 AM, Marianne Løvstad <mar.lovstad at gmail.com>wrote:

> Hello
>
> We are currently using Quik-cap 32 channels to record eeg data on a
> Neuroscan system. Do anyomne know of a channel location file we can use in
> eeglab?
>
> Marianne Løvstad
>
>
> 2012/9/26 Andreas Widmann <widmann at uni-leipzig.de>
>
>> Hi,
>>
>> googling the list archives (
>> http://www.google.com/search?q=highpass+site:sccn.ucsd.edu/pipermail/eeglablist/)
>> gives you several threads discussing this problem, e.g.
>> http://sccn.ucsd.edu/pipermail/eeglablist/2008/002210.html
>>
>> In a nutshell: The filter order as suggested by EEGLAB is too high for
>> this extreme cutoff-frequency. Use higher cutoff or different filter type.
>> Transition band width is defined as cutoff * 0.15 for firls-based filters
>> in EEGLAB IIRC.
>>
>> Note:
>> I recommend upgrading to a more recent version of EEGLAB where fir1 is
>> used as default filter function (in case you did not select firls
>> explicitly). firls-based filtering does not give optimal results (
>> http://www.frontiersin.org/Perception_Science/10.3389/fpsyg.2012.00233/full
>> ).
>>
>> Best,
>> Andreas
>>
>> Am 21.09.2012 um 17:03 schrieb tmle at notes.cc.sunysb.edu:
>>
>> > Hi eeglablist,
>> >
>> > I have been attempting to apply a highpass filter to our 64-channel
>> data set. So far I have only resampled (to 256) and rereferenced (to
>> average reference) prior to this step. However, when I enter .01 for the
>> lower edge in the basic filter option, eeglab will run for about 20 minutes
>> then give me an out of memory error (eeglab error in function firls() at
>> line 150). Could you please let me know why this might be the case? I'm not
>> sure whether my laptop memory is a problem as it has 8G of RAM. Also,
>> eeglab says the eegfilt () - highpass transition band width is 0.001Hz.
>> Shouldn't this be .01 like I have entered for the lower edge?
>> >
>> > Thanks,
>> >
>> > Le
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>
>
>
> --
>
>
> Marianne Løvstad
> Psykologspesialist/Ph.d. student
> Sunnaas sykehus
> tlf: + 47 93 45 20 03
>
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