[Eeglablist] Change reference after ICA

[dyao at uestc.edu.cn]

a recent paper may be valuable for this issue.
Dong etal (2019) A Comparative Study of Different EEG Reference Choices for Event-Related Potentials Extracted by Independent Component Analysis. Front. Neurosci. 13:1068. doi: 10.3389/fnins.2019.01068
Best wishes

> -----原始邮件-----
> 发件人: "Delorme, Arnaud" <adelorme at ucsd.edu>
> 发送时间: 2020-03-06 04:08:09 (星期五)
> 收件人: 
> 抄送: "EEGLAB List" <eeglablist at sccn.ucsd.edu>
> 主题: Re: [Eeglablist] Change reference after ICA
> 
> Dear Haneen,
> 
> If you want to compare with the literature, it is always better to use the same reference as what was used in a given article. Change of reference will potentially change the shape (latency/amplitude) of ERPs.
> 
> Also, when you reference your data, ICA components will be re-referenced as well, so you do not need to re-run ICA after changing your reference. This assumes that all data channels (including reference(s)) are included in the ICA decomposition. For example, if you do not include linked ears in the ICA decomposition, you cannot re-reference the data to linked ears and assume ICA components will be properly referenced (the function will return an error).
> 
> Best wishes,
> 
> Arno
> 
> > On Mar 5, 2020, at 10:53 AM, Joseph Dien <jdien07 at mac.com> wrote:
> > 
> > Although there are different preferences, there’s nothing intrinsically wrong with using CAR during analysis and yes you can always rereference.
> > 
> > You may find these papers helpful:
> > 
> > Dien, J. (1998). Issues in the application of the average reference: Review, critiques, and recommendations. Behavior Research Methods, Instruments, and Computers, 30(1), 34–43.
> > Dien, J. (2017). Best practices for repeated measures ANOVAs of ERP data: Reference, regional channels, and robust ANOVAs. Int J Psychophysiol, 111(1), 42–56. https://doi.org/10.1016/j.ijpsycho.2016.09.006 <https://doi.org/10.1016/j.ijpsycho.2016.09.006>
> > 
> > Joe
> > 
> >> On Feb 25, 2020, at 23:46, Haneen Alsuradi <haneen at nyu.edu> wrote:
> >> 
> >> Hi,
> >> 
> >> I had online reference of Fcz channel and I changed it to CAR during
> >> preprocessing. After changing reference to CAR, I performed ICA and removed
> >> blinks and muscle artifacts. I wish to perform ERP analysis. I am wondering
> >> is it ok to perform ERP analysis while having signals CAR referenced? I
> >> read some articles that recommend using T7 or T8 as references in case of
> >> ERP analysis. If so, can I re-reference at this point?
> >> 
> >> Will appreciate your feedback and insight!
> >> 
> >> Best
> >> Haneen
> >> _______________________________________________
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> > 
> > --------------------------------------------------------------------------------
> > 
> > Joseph Dien, PhD
> > Senior Research Scientist
> > Department of Human Development and Quantitative Methodology
> > University of Maryland, College Park
> > http://joedien.com
> > 
> > _______________________________________________
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------------------------------
Dezhong Yao
PhD, Cheung Kong Professor，AIMBE Fellow
Director, Key Laboratory for NeuroInformation,  Ministry of Education, China
Director, Int Joint Research center for Neuroinformation, Ministry of Science and Technology, China
Director, Center for Information in Medicine, University of Electronic Science and Technology of China, Sichuan,Chengdu  611731（qingshuihe campus）or  610054 (Shahe campus), China
Personal webpage:
http://faculty.uestc.edu.cn/yaodezhong/zh_CN/index.htm
http://www.neuro.uestc.edu.cn/bci/member/yao/yao.html
尧德中 电子科技大学 四川省脑科学与类脑智能研究院/神经信息教育部重点实验室/神经信息科技部国际联合研究中心/信息医学研究中心/生命科学与技术学院/成都脑科学研究院/