[Eeglablist] Copy ICA weights from 1Hz highpass to 0.1Hz highpass

[Isaiah Innis]

That is good to know, thank you. I'm relieved it's not a problem with
copying the ICA weights.

2016-03-22 5:33 GMT-04:00 Makoto Miyakoshi <mmiyakoshi at ucsd.edu>:

> Dear Isaiah,
>
> There is a known problem that if you have a big low frequency drift,
> EEGLAB's spectrum analysis fails. Once I understood how this happens when I
> discussed a related issue with Andreas, but now I don't remember it.
> Anyway, if you want to make the spectrum plot work, excessive low-frequency
> drift should be removed.
>
> Makoto
>
> On Fri, Feb 19, 2016 at 6:02 AM, Isaiah Innis <isainnis at umail.iu.edu>
> wrote:
>
>> Hello eeglablist:
>>
>>
>> Some of our datasets have displayed a large amount of slow frequency
>> drifts. See here for an example:
>> https://onedrive.live.com/redir?resid=A1398B0A4C8F85DE!2199&authkey=!AD6I0359QqJH5eA&v=3&ithint=photo%2cpng
>>
>> In order to address this, we have tried the suggestion mentioned on this
>> list of:
>> 1 Filtering each dataset with a 1Hz highpass
>> 2 Run ICA on this dataset
>> 3 Copy the ICA weights from the 1Hz dataset and apply them to our normal
>> 0.1Hz filtered dataset
>>
>> However when viewing the components in the 0.1Hz dataset (the one we
>> copied weights onto), I have noticed jagged spectra in the properties of
>> several components.
>> Here are a few examples (the 1Hz component is on the right in the image,
>> and the 0.1Hz is on the left):
>>
>>
>> https://onedrive.live.com/redir?resid=A1398B0A4C8F85DE!2191&authkey=!ALiODmU2Hqc5HZE&ithint=folder%2cpng
>>
>> Is there something wrong here? These steps were suggested in vol 130
>> issue 5 of the eeglab digest for reference.
>>
>> Thank you in advance,
>>
>> --
>> Isaiah Innis
>> Indiana University '13
>> EEG Technician, IUB IRF
>>
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



-- 
Isaiah Innis
Indiana University '13
EEG Technician, IUB IRF
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