[FieldTrip] about when to filter

[Roemer van der Meij]

Hi Lin,

Could you provide a little more information? How did you reduce your ocular
artifacts? How did you filter your data? What kind of fieldtrip settings
did you use, and what fieldtrip version were you using? Adding a picture of
the artifacts you're referring to might also help.

All the best,
Roemer


On Tue, Dec 18, 2012 at 2:55 AM, 蔡林 <bertram0611 at pku.edu.cn> wrote:

> Hi all,
>
>     Now I have an urgent problem about how to filter EEG data recorded in
> NeuroScan. I don't know the distiction between raw data(ie. cnt file)and
> the data after ocular artifact reduction. I filtered these two different
> data, and then I got diffrent results. Especially, I found many vertical
> lines after filtering the data through ocular artifact reduction, but I
> didn't find vertical lines filtering raw data.
>     Please give me some advice about how to filter offset. Thank you in
> advance.
>
> --
> Lin Cai
> Department of Psychology, Peking University, Beijing 100871, P.R.China
>
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> Content preview:  Hi all, Now I have an urgent problem about how to filter
> EEG
>    data recorded in NeuroScan. I don't know the distiction between raw
> data(ie.
>    cnt file)and the data after ocular artifact reduction. I filtered these
> two
>    different data, and then I got diffrent results. Especially, I found
> many
>    vertical lines after filtering the data through ocular artifact
> reduction,
>    but I didn't find vertical lines filtering raw data. Please give me some
>   advice about how to filter offset. Thank you in advance. [...]
>
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-- 
Roemer van der Meij M.Sc.
PhD Candidate
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognition
P.O. Box 9104
6500 HE Nijmegen
The Netherlands
Tel: +31(0)24 3655932
E-mail: r.vandermeij at donders.ru.nl
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