[Eeglablist] choice of reference

[Angel Tabullo]

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 

 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


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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? 
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>Thanks again for your attention and patience.
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>
>Angel Tabullo
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