[Eeglablist] Frontal Alpha Asymmeytri Score Problem

gökhan alper figen gokhanalper at gmail.com
Sat Feb 20 05:28:11 PST 2021

```Hi everyone,
i have phd project. My eeg device is emotiv epoc + 14 channel.
I applied on EEGLAB for raw egg preprocess:
1-remove baseline(for time)
2-select channel
4-remove epoch baseline(DCOFF)
5-1-45 Hz Fır-filter
6-???? i dont apply re-reference. Because my device reference is
Mastoid(P3-P4). But i am not sure for this step. I tried
re-reference(average), but this time ICA calculate one a component is under
calculated. HELP ME. Is it necessary to re-reference?
7- ICA
9- Last one on matlab, i applied frontal alpha asymmetry algorithm(8-13Hz).
But i have got another problem in here. I got AF3-AF4,  F7-F8,  F3-F4,
FC5-FC6 dipole electrode on frontal lobe. Which dipole is important frontal
alpha asymmetry? Used one by one at different times in the literature.İn
addition i have different score same trial(for example: AF3-AF4-->positive,
F7-F8--> negative,  F3-F4-->positive, FC5-FC6-->negative ). is it possible?

FAA SCORE:
AF4-AF3 F8-F7 F4-F3 FC6-FC5 MeanFAA
0,835219 1,803982 0,768355 1,929266 1,334206
1,552542 0,523332 1,283658 0,662677 1,005552
0,212559 0,767369 -0,09146 0,533678 0,355537
2,695686 0,651778 0,208955 1,1194 1,168955
0,021023 0,745326 0,28 1,529339 0,643922
0,400539 0,693247 0,435739 1,952571 0,870524
0,069624 0,294606 1,358425 0,82884 0,637874
0,646927 0,528689 0,728926 1,521723 0,856566
0,260962 -0,12185 1,093646 1,173347 0,601527
1,228531 1,233191 1,044209 1,793257 1,324797
0,020307 0,647727 1,570798 1,414552 0,913346
-0,58441 0,484781 0,804384 1,398788 0,525887
1,199436 1,282988 0,766968 1,721898 1,242822
-0,2001 -0,69111 0,976038 1,513998 0,399708
0,184563 1,183316 1,678075 2,736944 1,445725
-0,10969 0,93127 0,343262 0,51734 0,420546
-0,22403 0,445983 -0,2119 0,763368 0,193354

thanks
```