[wineeg] Re: Mitsar question
- From: Joe Siri Ekgren <joesiri@xxxxxxxx>
- To: wineeg@xxxxxxxxxxxxx, ponomarev@xxxxxxxxxx
- Date: Wed, 9 Jul 2003 13:50:05 +0200
Hi David,
Thanks for keeping this list alive!
I can=B4t help you out with the scissors tool scissors tool on the
toolbar, it is grayed out all the time in my version of WinEEG.
Instead in WinEEG I use the "erase" tool for deleting portions of the
EEG, which is the big " X" icon (three tools to the right of the
scissors on the toolbar). The erase function goes by three names:
- toolbar: "Erase"
- Edit menu: "Clear"
- right-clicking the mouse while over the selected EEG displays a
menu with two "Copy" choices at the top, but two different icons.
The lower has the big X icon and though it also says "copy", it is
actually the erase function.
(Right clicking is the fastest option, I haven=B4t found a a keyboard
shortcut.) The icon is always the same, and you always get a dialog
asking for confirmation before deleting a part of the EEG.
The drawback with erasing is of course that you are deleting portions
that later might be valuable, or you have to keep duplicate files:
one original and one artefacted.
Another drawback is that your timescale is altered and that one loses
track of exactly when events occurred. (Ex: While recording an EEG, a
loud thump in room next door occurs at 12:04:32. Could this give a
state change? If I had deleted 22 seconds of EEG I would afterwards
have to inspect the EEG at 12:04:10. )
Wishlist:
1 Removing portions of the EEG from the analysis, displaying these
areas with a different background colour. (Maybe this is what the
scissors tool is supposed to do?) (Keeping the raw EEG intact would
also eliminate the hassle of the dialog box for deletion.)
2 A hide/view function for unwanted selections would be beneficial.
(Data would always be there for later inspection, timecoding would be
intact.)
3 This feature could be a useful educational tool for practicing
the art of EEG artefacting, if one had multiple tracks for
disregarding EEG data. (Ex: After artefacting an EEG, you could with
a button-click display how an EEG guru artefacted the same EEG, and
compare with your artefacting.)
BTW the list-server strips attached files, which happened to your
previous post.
I hope this was of some help. Nothing like artefacting to keep one
out of the summer heat!
Joe
At 16:04 +0100 07.07.03, Vernon, David wrote:
>Hello
>
>i am going through an EEG file that i recorded using the Mitsar and after
>completing the automatic EOG correction i wanted to go through the raw trac=
e
>myself and cut out any very noisy sections. I Managed to do this using the
>mouse and the scissors symbol on the tool bar. When i do this a bold blue
>line appears at the bottom of the raw EEG file.
>
>However, when i then run the analysis it gives exactly the same output as a
>raw EEG that i have not gone through and removed the additional artefacts.
>Thus i must be missing something out. I have checked the manual but can fin=
d
>no reference to manual artefact rejection using the cut tool. Can you help
>me please, what do i have to do to make sure that the sections i have cut
>are not included in the analysis?
>
>thanks
>
>david
>
>David J Vernon PhD
>Dept. of Cognitive Neuroscience & Behaviour
>Imperial College London
>St Dunstan's Road
>London
>W6 8RP
--
Joe
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