Olimex Support Forum

Others => Biofeedback - EEG, ECG, EKG => Topic started by: nugroho.budi on December 11, 2013, 11:36:05 pm

Title: CH2 problem and AE-Hair
Post by: nugroho.budi on December 11, 2013, 11:36:05 pm
Hi,
I purchased an EEG-SMT, 1 PE and 4 AE from olimex couple weeks ago.
after strugling with driver problem and Microsoft Ball Point Mouse.

now, I am struggling with another problem.
First,
I plug in DRL and hold it with my hand, attach the AE CH1+ and AE CH1- my right side temple and left side temple, and then attache AE CH2+ and AE CH- to my forehead.
using Brain Bay: the signal from CH2 is flat kind of show that didnt get any reading from the forehead. I have tried to switch the electrodes and get the same result. Did I do something wrong or my CH2 is kind of broken?

Screenshots from BrainBay:
(http://s26.postimg.org/75efgnyyd/2013_12_12_03_42_09_Brain_Bay_modeeg_test_con.jpg) (http://postimg.org/image/75efgnyyd/)
(http://s26.postimg.org/bh315o5v9/2013_12_12_03_41_25_Brain_Bay_modeeg_test_con.jpg) (http://postimg.org/image/bh315o5v9/)
(http://s26.postimg.org/3n2fk9y2d/2013_12_12_03_41_08_Brain_Bay_modeeg_test_con.jpg) (http://postimg.org/image/3n2fk9y2d/)



Second problem is when i try to put the electrodes in my Ocipital lobe, O1 or O2(SSVEP recording method) I get very noisy signal (i forget to take a screenshot for this). Is it because of the hair?

thank you! :)
English isn't my first language, so please excuse any mistakes. ;D
Title: Re: CH2 problem and AE-Hair
Post by: LubOlimex on December 12, 2013, 09:39:53 am
Hello,

Can you confirm the second channel is properly configured in Brain Bay? Also what happens if you swap the positions of the electrodes on your head - if channel two is working properly it should show relatively the same as what channel one showed before the position swap? Can you test with Electric Guru as well (https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/resources/ElecGuru40.zip (https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/resources/ElecGuru40.zip))?

QuoteSecond problem is when i try to put the electrodes in my Ocipital lobe, O1 or O2(SSVEP recording method) I get very noisy signal (i forget to take a screenshot for this). Is it because of the hair?


This might be either from a bad contact with the skin of the electrodes in channel two; or from bad contact of the passive DRL electrode with the skin.


Best regards,
Lub/OLIMEX