[Eeglablist] Reference electrode

[Dezhong Yao]

Dear Victor
    "Reference" means a " standard" to reflect the variations of for other active channels, thus it should be zero or a constant, certainly non-active.
    For scalp recordings, there is no point on the scalp surface, the potential is zero or constant, that's why a re-reference is needed after recordings in general, the most common re-references in current practice are: REST ( www.neuro.uestc.edu.cn/rest), AR (the average of the all scalp recordings), and LR (average of the two ears), REST by reconstructing a zero point through an electric physical model method, AR and LR are based on assumptions that the average of all the recordings, or the average of the two ears are approximate zero, if you believe these assumptions, you may adopt one of them. Otherwise, REST should be adopted.
      However, if your channels are very limited, REST and AR can not be adopted, you'd chose a relative non-active point on the scalp as the reference point.
  
---------- Origin message ----------
>From："Victor Flores Benites" <suryavf at gmail.com>
>To：eeglablist at sccn.ucsd.edu
>Subject：[Eeglablist] Reference electrode
>Date：2016-08-03 04:07:07Dear all,

I am working with g.USBamp (g.tec)
I use active electrodes for EEG acquisition. From what I understand, a
special electrode is used for ground.
The reference also has to be a special electrode? Can I use an active
electrode as reference?


Thanks for your help!

--
Victor Flores Benites
Bachiller en Ingeniería Electrónica
Practicante Profesional - UTEC
+(51) 975712054 - RPM: #975712054
suryavf at gmail.com | vflores at utec.edu.pe <vfloresb at uni.pe> | vfloresb at uni.pe
 
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