[Eeglablist] Mastoid Signal

[Simon-Shlomo Poil]

Dear James,

I would say your issue can not be solved after the measurements,
because the amplifier uses the linked mastoid signal as reference for
all other measured values.

However you could try to simply remove the bad mastoid, and
re-reference the signal to the other mastoid or average reference. But
potentially your recording will be very noisy..

The best solution is probably change your reference directly on the
amplifier. I would suggest Cz, and then cover the EEG cap with a top
cap.

--
Simon-Shlomo Poil
http://www.nbtwiki.net



2013/1/24 James Kean <jamesdkean at gmail.com>:
> G'day guys
>
> This may not be the right forum to ask so you can just tell me where to go
> if it's not but I wanted to ask about mastoids.
>
> I am testing children aged 6 to 14 years, with behavioural difficulties, as
> you can imagine they are quite difficult to get a clean EEG signal from.
> On occasion a mastoid will dislodge slightly or the child will itch it
> giving it a bad signal...
>
> My question is this:
> Is there a way to tell whatever program you're using like EEGlab or
> Neuroscan to use the signal from the clean mastoid rather than the bad
> mastoid?
> OR to use majority of the signal from the good one and less from the bad
> one?
>
> Just wanted to know because these kids tend to wriggle a lot causing these
> kinds of problems.
>
> If anyone knows that'd be a great help.
>
> Cheers
> James
>
>
> --
> James Kean
> PhD Candidate
> Swinburne Centre for Human Psychopharmacology
> Hawthorn, Australia
> JKEAN at swin.edu.au
> Ph:  9214 5242
> Mobile: 0425 735 847
>
> For information on Brain Health, Developmental Disorders and Natural
> Medicines
> http://www.naturalhealthera.com/channel.php?cid=49
>
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