[Eeglablist] Filtering issues

[Marianne Løvstad]

its a .map file, is that readable? Please excuse my naive questions...
Neuroscan support is really hard to get in contact with.

Marianne

2012/10/1 Tarik S Bel-Bahar <tarikbelbahar at gmail.com>

> 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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>
>


-- 


Marianne Løvstad
Psykologspesialist/Ph.d. student
Sunnaas sykehus
tlf: + 47 93 45 20 03
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