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raw data at AF3 is broken

Hi!

I talk little in English because I’m Japanese.
I use Emotiv Insight and measure brainwave.Contact quality is 100%.
And I use EEGLAB, and analyze it.
I use (1Hz) high path filter,
(30Hz)low path filter,
and clearline.
Then,I see [scroll channel activity].
That time, there is big ploblem.
Brain waves at AF3 is mo waveform.(at Denomalization) but it is big wave 10 micro volt once a second(at Nomalization)
Other electcode is normal.

What is it??

Thankyou, your help.


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