[FieldTrip] iEEG square wave 'notch' artifact

[Arjen Stolk]

Hi Tim,

Those may be due to wire tugs, possibly as a result of the subject making
(abrupt) movements (of the head). Logically, they are artifacts and need to
be dealt with. Hopefully, someone here has found a way to do so effectively.

Best,
Arjen

2017-04-07 11:32 GMT-07:00 Tim Meehan <timeehan at gmail.com>:

> Dear FieldTrippers,
>
> I have a recurring artifact in my iEEG data, a very brief (10-15 ms)
> square-wave-like 'notch' that occurs intermittently and across many
> channels. It also varies in polarity and amplitude, seemingly randomly.
> Here's a link showing an example trial containing many of these artifacts:
>
> https://drive.google.com/open?id=0B4m5PGO25j3mYkVPUEI5aDZERDA
>
> As of now I've been advised to throw out trials in which these occur, but
> they are very frequent during some sessions. I wonder if alternatively
> there is some way to selectively remove these? My guess is one could do
> some sort of template matching to identify when they occur and interpolate
> across, but I have no idea how to do that or if it's feasible. Does anyone
> have any insight?
>
> Thank you,
> Tim
>
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