[Eeglablist] Rereference

[Mike Hartman]

Dear Eric, you asked for literature recommendation explaining the utility
of average referencing. I suggest the book 'Electric Fields of the Brain'.

On Sat, Oct 4, 2014 at 2:50 AM, Simon Finnigan <finnigan.simon at gmail.com>
wrote:

> Hi All
>
> Firstly I must say that as a scientist, I find the rationale from Jason
> via Makoto to be un-scientific and unsatisfactory.
>
> Second - This will only partly answer your question I think, but here
> goes: it all depends on how you're analysing your data [what you're looking
>  at/for] and particularly, whether or not scalp topographies are of
> interest to you - but in general and in brief, the consensus seems to be
> that common-average referencing is preferable over mastoid referencing, at
> least - and probably other references sites too [e.g. vertex; nasion].
> [Also are your data referenced to one or both mastoids? and if both - were
> they linked, or averaged together after recording?]
>
> My 2002 paper in 'Neuropsychologia' addressed this issue scientifically,
> at least in part - e.g. see final figure [albeit we weren't doing ICA back
> then either!].
>
> Regards, Simon
>
>
> On 04/10/2014, at 8:21, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>
> Here is update.
> I asked the question to Jason. He told me that the main reason avg
> reference is useful is that it returns brain maps that look like nice
> localized sources inside the head with red blob and slight negative
> (aqua/green) background. This makes sense.
>
> Makoto
>
> On Thu, Oct 2, 2014 at 10:00 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
>> Dear Eric,
>>
>> I have the same question for long time. In my case, because I run ICA and
>> remain in IC analysis and almost never come back to channels, I really
>> wonder if I need re-referencing at all.
>>
>> I've heard Jason Palmer, who wrote AMICA for EEGLAB, say average
>> reference before ICA is necessary, but he did not give me a clear
>> explanation for that. Scott wanted to know it too, but we were interrupted
>> at that time. Next time I'll ask it to him (when I ever see him in the
>> lab...)
>>
>> Makoto
>>
>> On Tue, Sep 30, 2014 at 2:44 PM, Eric HG <erichg2013 at gmail.com> wrote:
>>
>>> Dear list,
>>>
>>> I have read the tutorial on the site and it says: "Converting data,
>>> before analysis, from fixed or common reference (for example, from a common
>>> earlobe or other channel reference) to 'average reference' is advocated by
>>> some researchers, particularly when the electrode montage covers nearly the
>>> whole head (as for some high-density recording systems)."
>>>
>>> I have data collected with a mastoid reference and I was wondering in
>>> which cases it would be considered best to rereference to the average? Are
>>> there any specific papers about rereferencing that anyone would recommend?
>>>
>>> Regards,
>>>
>>> Eric
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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