[Eeglablist] Dealing with a noisy TP10 channel for re-referencing (average TP9-TP10)

ivano triggiani ivanotriggiani at gmail.com
Thu Feb 11 15:27:35 PST 2021


Dear Boki,

unfortunately, the reference electrodes must be checked carefully during
the recording process. I won't use the single mastoid to re-reference or
use the interpolated TP10. At this point, a thing you could do, if you want
to avoid the common average, is the re-reference to REST average (Yao et
al.,2001, available on EEGlab as a plugin).

Best,
Ivano

PS The Nike-logo shape killed me! :-D

----
Antonio Ivano Triggiani, Ph.D.
Research Physiologist [C]
Human Motor Control Section, Medical Neurology Branch
National Institute of Neurological Disorders and Stroke
National Institutes of Health
10 Center Drive, Building 10, Room 7D42
Bethesda, MD 20892-1428
Phone: (301) 402-2983
MSC 1428
________________________________________________



On Thu, Feb 11, 2021 at 3:57 PM Boki Wang <pwang91 at asu.edu> wrote:

> Hi list,
>
> I am new to (pre)-processing of resting-state EEG data. I am using a 32
> channel system, where the reference electrode is the right earlobe. During
> offline analysis, I would re-reference the data to average mastoids
> (average of TP9 and TP10).
>
> But the TP10 channel for one of the participants is contaminated by noise,
> so much so that the power spectrum doesn't look like 1/f function, but a
> NIKE logo where power for frequencies of 12Hz and beyond starts increasing
> (hope this makes sense). I don't think it's appropriate to use the data
> from this channel for re-referencing.
>
> In this case, what's the best thing to do for re-referencing? Can I
> interpolate TP10 electrode and still use the interpolated data for
> re-referencing? Or, if I remove this electrode and use average reference
> (which isn't great for 32 channel data either right?), can I process this
> participants' data with everyone else's?
>
> Would appreciate any pointers!
>
> Thank you!
>
> Boki
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