[Eeglablist] Strange Displacement in ERP Images

[Makoto Miyakoshi]

Dear all,

If you apply low-pass filter in plotting ERPs, you may find
off-the-baseline ERPs. This is because filtering is done *after* baseline
correction. Statistical results shown are applied before filtering. I want
to share this info because this could be confusing. I have reported it
quite a long time ago to bugzilla.

Makoto


2013/9/16 Mikołaj Magnuski <imponderabilion at gmail.com>

> Hey,
> it looks like you did not perform baseline correction, am I correct?
> Baseline correction is a simple form of detrending - for each epoch it
> removes the mean from a specified part of the epoch from the whole epoch.
> You can find this option in edit or tools (I don't remember, but there
> should be an info on EEGlab wiki) --> 'remove baseline'.
> 14 wrz 2013 02:21, "Steven Pillen" <stevendpillen at gmail.com> napisał(a):
>
>>  Hello again, EEGLAB list.
>>
>> When processing ERP images, we noticed a frequent occurrence.  It looks
>> like there is something displacing one of the ERPs compared to the other,
>> as seen here: http://i.imgur.com/SlXuTqJ.png
>>
>> Is there some way to make these more properly overlap?
>>
>> Thank you,
>> Steven Pillen
>>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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