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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. <br>
<br>
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. <br>
<br>
On 06/15/2012 04:49 AM, Angel Tabullo wrote:
<blockquote
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<div>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)?.</div>
<div><br>
</div>
<div style="font-size: 12pt; font-family: 'times new roman','new
york',times,serif;">
<div style="font-size: 12pt; font-family: 'times new
roman','new york',times,serif;">
<div dir="ltr"> <font face="Arial" size="2">
<hr size="1"> <b><span style="font-weight: bold;">De:</span></b>
ty <a class="moz-txt-link-rfc2396E" href="mailto:tiany20032003@163.com"><tiany20032003@163.com></a><br>
<b><span style="font-weight: bold;">Para:</span></b>
Angel Tabullo <a class="moz-txt-link-rfc2396E" href="mailto:angeltabullo@yahoo.com"><angeltabullo@yahoo.com></a> <br>
<b><span style="font-weight: bold;">CC:</span></b>
<a class="moz-txt-link-rfc2396E" href="mailto:eeglablist@sccn.ucsd.edu">"eeglablist@sccn.ucsd.edu"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:eeglablist@sccn.ucsd.edu"><eeglablist@sccn.ucsd.edu></a> <br>
<b><span style="font-weight: bold;">Enviado:</span></b>
Jueves, 14 de junio, 2012 10:05 P.M.<br>
<b><span style="font-weight: bold;">Asunto:</span></b>
Re:[Eeglablist] choice of reference<br>
</font> </div>
<br>
<div id="yiv1828673947">
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<div> Hello, everyone,</div>
<div> </div>
<div> 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.</div>
<div> </div>
<div>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.</div>
<div><br>
REST is freely download and free to use, the
website:<br>
doi:10.1016/j.clinph.2010.03.056 ,or,
<a class="moz-txt-link-abbreviated" href="http://www.neuro.uestc.edu.cn/rest">www.neuro.uestc.edu.cn/rest</a><br>
and if you have any problem in your practice,
pls send e-mail to <a moz-do-not-send="true"
rel="nofollow" ymailto="mailto:xupeng@uestc.edu.cn"
target="_blank" href="mailto:xupeng@uestc.edu.cn">xupeng@uestc.edu.cn</a>
</div>
<div><br>
Reference:<br>
Yao D.A method to standardize a reference of
scalp EEG recordings to a point at infinity. Physiol
Meas 2001;22:693–711.<br>
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<br>
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.<br>
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.<br>
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.<br>
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 <br>
<br>
Yin Tian<br>
<br>
</div>
<div>--<br>
<div> </div>
</div>
<div><br>
</div>
At 2012-06-12
11:36:40,"Angel Tabullo" <a class="moz-txt-link-rfc2396E" href="mailto:angeltabullo@yahoo.com"><angeltabullo@yahoo.com></a>
wrote:<br>
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id="yiv1828673947isReplyContent">
<div style="background-color: rgb(255, 255, 255);
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'times new roman','new york',times,serif;">
<div>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? </div>
<div><br>
</div>
<div>Thanks again for your attention and patience.</div>
<div><br>
</div>
<div>Angel Tabullo</div>
</div>
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<br>
<br>
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id="yiv1828673947netease_mail_footer"></span></span></div>
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