[Eeglablist] changing the reference electrode for use the SIFT toolbox

[jfochoaster .]

Thanks Dr. Tim,

I am using your toolbox for around one year, is a great toolbox

I have two doubt in the ScriptingExample,

i) Why do you use the following instruction?

EEG(cnd).CAT.Conn = stat_getDistribMean(PConn_boot(cnd));

ii) For which measures are tested the statistical routines?

Thanks in advance


On Wed, Nov 13, 2013 at 3:12 PM, Tim Mullen <mullen.tim at gmail.com> wrote:

> Dear John,
>
> If you are using connectivity measures with channel data, an average
> reference or laplacian reference are better choices than linked mastoid
> reference.  See the following paper for a good discussion in the context of
> coherence analysis (with applicability also to Granger causality):
>
> Nunez, P. L., Srinivasan, R., Westdorp, A. F., Wijesinghe, R. S., Tucker,
> D. M., Silberstein, R. B., & Cadusch, P. J. (1997). EEG coherency. I:
> Statistics, reference electrode, volume conduction, Laplacians, cortical
> imaging, and interpretation at multiple scales. *Electroencephalography
> and clinical neurophysiology*, *103*(5), 499–515.
> Be aware that connectivity measures applied to channels will generally
> suffer from an increased rate of spurious coupling (false positives) due to
> volume conduction. Spatial laplacians can help mitigate this.
>
> If you are using components then the choice of reference is irrelevant
> (ICA produces a reference-free signal).
>
> Tim
>
>
> On Fri, Nov 8, 2013 at 2:20 PM, jfochoaster . <jfochoaster at gmail.com>wrote:
>
>> Dear EEG experts,
>>
>> I have a lot of eeg data with the average as reference. This data comes
>> originally with one electrode near to CZ as reference
>>
>> Is valid re-reference the data to linked mastoid?
>>
>> This is because I am using the SIFT toolbox over the channels and the DFT
>> measure is applied over eeg data with linked mastoid as reference
>>
>> If I use components instead of channels, I can forget the reference?
>>
>> Thanks in advance
>>
>> --
>> John Ochoa
>> Docente de Bioingeniería
>> Universidad de Antioquia
>>
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>
>
>
> --
> ---------  αντίληψη -----------
>



-- 
John Ochoa
Docente de Bioingeniería
Universidad de Antioquia
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