[Eeglablist] choice of reference

[Ramesh Srinivasan]

A recent commentary on this method was published by Paul Nunez.  It has 
some good qualities but also some disadvantages as in any reference 
method.  I would look at that article before committing to this approach.

If I were working with a data set 19 electrodes I would look at 
constructing bipolar pair signals.  These have better spatial resolution 
than any conventional reference scheme.

On 06/15/2012 04:49 AM, Angel Tabullo wrote:
> Thank you very much for the reference. Please excuse the potentially 
> silly question but: is the method equally effective when you have a 
> relatively small number of electrodes (like 19)?.
>
> ------------------------------------------------------------------------
> *De:* ty <tiany20032003 at 163.com>
> *Para:* Angel Tabullo <angeltabullo at yahoo.com>
> *CC:* "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
> *Enviado:* Jueves, 14 de junio, 2012 10:05 P.M.
> *Asunto:* Re:[Eeglablist] choice of reference
>
>  Hello, everyone,
>  Reference is a very fundamental issue in scalp EEG based studies, as 
> I know, all the previous efforts are focused on the selection of a 
> relatively less active reference point, such as linked ears, Cz, Fcz, 
> neck, toe  etc, however they all  are based on the subjective 
> judgement of the resercher which may be different frome one to the other.
> In recent years, Dr Yao designed a method to translate the actual 
> recordings with an actual physical reference, such as Cz, 
> uni-mastoid,  to the idea recordings with reference at Infinity (zero 
> theoretically) (REST-- reference electrode standardization technique, 
> 2001). It has been evaluated and compared with the other common 
> references thoroughly. According to their detailed numeric 
> evaluation, in all cases, the best one is REST (zero), then the 
> average reference.  The linked-ears, or uni-mastord is not 
> recommended. With my practice, REST does improve the data quality in 
> ERP and EEG analysis. The followings are the papers showing the details.
>
>          REST is freely download and free to use, the website:
>         doi:10.1016/j.clinph.2010.03.056 ,or,  www.neuro.uestc.edu.cn/rest
>         and if you have any problem in your practice, pls send e-mail 
> to xupeng at uestc.edu.cn <mailto:xupeng at uestc.edu.cn>
>
>  Reference:
>          Yao D.A method to standardize a reference of scalp EEG 
> recordings to a point at infinity. Physiol Meas 2001;22:693–711.
>          Yun Qin,Peng Xu,Dezhong Yao.  A comparative study of 
> different references for EEG default mode network: The use of the 
> infinity   reference .ClinicalNeurophysiology121(2010)1981–1991
>          Yao D,Wang L,Oostenveld R,Nielsen K D,Arendt-Nielsen L,Chen 
> A. A comparative study of different references for EEG spectra 
> lmapping:the issue of the neutral reference and the use of the infinity 
> reference. Physiol Meas 2005;6:173–84.
>          Yao D,Wang L, Arendt-Nelsen L,Chen A C.The effect of 
> reference choices on the spatio-temporal analysis of brain evoked 
> potentials:the use o finfinite reference. Comput Biol Med 
> 2007;37(11):1529–38.
>          Zhai Y,Yao D. A study on the reference electrode 
> standardization technique for a realistic head model. Comput Methods 
> Programs Biomed 2004;76:29–238.
>          Marzetti L, Nolte G, Perrucci MG, et al. ,The use of 
> standardized infinity reference in EEG coherency studies, NeuroImage, 
> 36(1): 48-63, MAY 15, 2007
>
> Yin Tian
>
> --
>
> At 2012-06-12 11:36:40,"Angel Tabullo" <angeltabullo at yahoo.com> wrote:
>
>     Hello everyone! I wanted to ask if there's an advantage in using
>     average reference over linked mastoids or earlobes when you are
>     working with 19 channels and considerable levels of noise.
>     Furthermore: can reference affect the SNR of an ERP?
>
>     Thanks again for your attention and patience.
>
>     Angel Tabullo
>
>
>
>
>
>
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