[Eeglablist] Reference after channel interpolation to use REST

[dyao at uestc.edu.cn]

hello everyone,

“ Bandpass filter 1-30 Hz > Reject noisy channels > Average rereference > Epoch, baseline removal > ICA > Reject noisy ICs using MARA > Interpolate bad channels” may not be the proper choice
 usually, average re-reference needs to be based on clear montage(Steven Luck's Book suggested to list the detailed channels used in average), after you rejecting some channels, no one know the deatailed channels of your average. So the proper choice should be to have a re-refernece at the end, no matter average rereference did or not in the middle.

Bandpass filter 1-30 Hz > Reject noisy channels >Average rereference > Epoch, baseline removal > ICA > Reject noisy ICs using MARA > Interpolate bad channels>Average rereference
  
Another choice is to use zero-reference at infinity (REST) to replace average a the end. The goal of average is to approach zero, it depends on montage, channel number and head shape, REST directly aims at zero re-reference, so the procedure may be:

Bandpass filter 1-30 Hz > Reject noisy channels >Average rereference > Epoch, baseline removal > ICA > Reject noisy ICs using MARA > Interpolate bad channels>REST ( free software can be found at:  Dong L, Li F, Liu Q, Wen X, Lai Y, Xu P and Yao D (2017) MATLAB Toolboxes for Reference Electrode Standardization Technique (REST) of Scalp EEG. Front. Neurosci. 11:601. doi: 10.3389/fnins.2017.00601 )

Best wishes

> -----原始邮件-----
> 发件人: "#HENG JIAMIN GLADYS#" <JHENG007 at e.ntu.edu.sg>
> 发送时间: 2020-01-30 17:37:16 (星期四)
> 收件人: "EEGLAB List" <eeglablist at sccn.ucsd.edu>
> 抄送: 
> 主题: [Eeglablist] Reference after channel interpolation
> 
> Dear EEGLab list,
> 
> I'm looking at time-frequency analyses for a dataset, of which one of the task consist of 12 trials, with each trial being 45 seconds.
> 
> Following is my pre-processing pipeline:
> Bandpass filter 1-30 Hz > Reject noisy channels > Average rereference > Epoch, baseline removal > ICA > Reject noisy ICs using MARA > Interpolate bad channels
> 
> Up till after rejecting noisy ICs, the GUI interface still shows that the Reference is "average". However, after interpolation, the Reference became "unknown". May I enquire if this is supposed to be the case or I might have done something incorrectly in the process?
> 
> Thanks in advance,
> Gladys
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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/