too large EEG Gain?

Connection, ECG, EMG, EDA, etc.
Gang
Posts: 7
Joined: Tue Jul 05, 2016 2:55 pm

too large EEG Gain?

Postby Gang » Mon Jul 03, 2017 1:52 pm

Hello everyone,

I don't know if it's just me or any of you also have this question. The bitalino revolution board read EEG signal successfully but the signal always saturated (out of range from -41.25uv to 41.25uv) when I moving (motion artifact) or blinking my eyes (eye movement artifact). Did I do something wrong in calculation or it is how it designed. I can get enhanced alpha wave when eyes shut, so the acquired signal makes sense.

I placed my positive electrode in forehead near Fp1, reference electrode in right mastoid and ground in left mastoid.

Thanks for your advice.

BITalino
Site Admin
Posts: 567
Joined: Tue Aug 27, 2013 3:47 pm

Re: too large EEG Gain?

Postby BITalino » Mon Jul 03, 2017 3:01 pm

Hello,

Indeed your described behaviour should correspond to the expected behaviour... given that BITalino has 10-bit resolution we have designed the sensor with a relatively high gain, reason for which it is particularly sensitive to motion and other artefacts. You can see an example signal in normal condition here: http://bitalino.com/datasheets/EEG_Sensor_Datasheet.pdf

Best regards,
The BITalino Team

Gang
Posts: 7
Joined: Tue Jul 05, 2016 2:55 pm

Re: too large EEG Gain?

Postby Gang » Mon Jul 03, 2017 3:19 pm

Thanks for the prompt reply. I'll test on different positions for amplitude scale later.


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