[Eeglablist] Question about Order of rereferencing and artifact removal

[Makoto Miyakoshi]

Dear Stephen,

Oh come on, you should not say 'mistakenly thinking about referencing'
because at that time it was not clear if Steven was asking about average
referencing to all channels or mastoids. So no worries. I appreciate you
always help others in the list.

Makoto

2013/3/23 Stephen Politzer-Ahles <politzerahless at gmail.com>

> Hi Mikolaj,
>
> Yes, you and Makoto are correc about the order issuet--when I sent that
> last message I was mistakenly thinking about referencing to average
> mastoids, rather than average reference.
>
> Best,
> Steve
>
>
> On Sat, Mar 23, 2013 at 1:02 PM, Mikołaj Magnuski <
> imponderabilion at gmail.com> wrote:
>
>> Dear Stephen,
>>
>> as I understand it Makoto was referring to bad channel rejection before
>> average referencing. Depending on the number of channels their average can
>> be dragged more or less by a high-amplitude 'dancing' bad channel.
>> I dont think this would introduce  serious artifacts, but is worth
>> considering (I was doing averege reference on a group of files lately and
>> did not think about removing bad channels first, while some of the files
>> actually have these 'dancers' present, so I'm going to change my pipeline
>> and see whether it changes anything).
>>
>> BTW - is it sufficient to mark the channel as bad (in EEG substructure
>> with channel info) for it to not be considered during rereference to
>> average or should I interpolate or delete the channel?
>>
>> Regards,
>> Mikolaj Magnuski
>>
>
>
>
> --
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://people.ku.edu/~sjpa/
>
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-- 
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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