Emotiv EEG Signal Quality Fluctuation,

[Upadhayay Bibek]

I have been using the Emtoiv EpochX headset, one of the problems that I have been facing is that even though the EEG Contact quality is 100%, the EEG signal quality keeps on fluctuating. For example, its on 95% after the setup when starting the experiment inside the software, it drop to 5% and goes back to 90%. The problem is that the signal quality drops from very high to very low keeps on doing back and forth. I have followed all the procedures for the setup of the headset based on the manual, even the felts are soaked properly in the saline solution.

Is it supposed to be like that? or is there something wrong with the device?
Any suggestion would be greatly appreciated.

[Baldassim Jose Francisco]

Hi Ibibek!

I have the same problem herer ! Did you manager to solve it?

Thanks !

[luckham jerill]

Hello! Thank you for your post.
<div>The EQ map is measuring the quality of the brain signal for each sensor, and it takes into account movement, noise, signal amplitude, and many other parameters that make it much more sensitive. It is totally normal for the EQ to flicker and it DOES take time for the signal to settle, so adjust each sensor individually, sit still and wait patiently for 3-5 seconds. If the signal flickers green at any point, it’s likely the signal is good, but it is imperative to sit still to see if it maintains the green.</div>
 
<div>It is expected that the EQ signal will flicker – this is an indication that we are detecting movement, noise, or other interferences that mean the brain signal is not perfect. To reiterate, it behaves very differently to CQ and it is NOT expected to remain steady at all moments in the recording, particularly if people are not sitting still.</div>
 
<div>If your sensors remain orange or red, ensure your hair is out of the way, the sensor is touching the scalp and there is enough prime fluid, gel, or saline solution.</div>
 
<div>You can refer to this link for more information about our CQ and EQ.</div>
 

[Baldassim JOSE Francisco Toesca]

understood,
but we continue to have problems even with the person with a shaved head, sitting and completely unmoved! Unable to start recording. Could it be a problem with the hardware? how can i test it?

[luckham jerill]

Hello Jose,  Thank you for your question. We apologize for any inconvenience this may have caused. Please send an email to support@emotiv.com so we can further assist. We look forward to your follow-up.

[CARRASCOSA GABRIEL]

Hello, I have the same problem with the EPOC-X.

The CQ reaches 100%, the participant remains seated, calm, the sensors are wet and have good contact with the scalp, but the EG quality fluctuates.

When the participant move his eyebrows the EEG quality goes to 0%, the same case when moves his head while seated and when the person gets up from the seat and walks. You can see that is does not matter if the participant is calm and seated, makes slow head or facial movements or is standing up and walking, we obtain 0% or low percentages in any case.

In your web page we saw that this sensor has been used in a supermarket when the person is standing up and walking, can you tell us how you obtained good EEG quality and no leak of packages data?

Thank you for your help.

[luckham jerill]

Hello Gabriel.  Thank you for your question.

The EQ map is measuring the quality of the brain signal for each sensor, and it takes into account movement, noise, signal amplitude, and many other parameters that make it much more sensitive. It is totally normal for the EQ to flicker and it DOES take time for the signal to settle, so adjust each sensor individually, sit still and wait patiently for 3-5 seconds. If the signal flickers green at any point, it’s likely the signal is good, but it is imperative to sit still to see if it maintains the green.

It is expected that the EQ signal will flicker – this is an indication that we are detecting movement, noise, or other interferences that mean the brain signal is not perfect. To reiterate, it behaves very differently to CQ and it is NOT expected to remain steady at all moments in the recording, particularly if people are not sitting still, even if they are just moving their eyebrows or shifting gaze, that’s still muscle movement.

You can refer to this link for more information about our CQ and EQ.

 

[Carriquiry Joaquin Matias]

Hi Luckham Jerill,

Thank you for your answers. Although it’s the same answer copied and pasted, I’m writing here with the same concern, but applied to an Emotiv Insight.

EQ stays at 100% only in very few and rare occasions. Also, if I move any part of my face, drink water, or, let alone, decide to take a walk, the EQ will drop to 0% in no time.

Could you please provide more information besides what you’ve already replied? Is it possible that a batch of devices came with this issue? It seems to be something that a lot of people are experiencing.

Thanks.

[luckham jerill]

Hello!  Thank you for your reply.  The EQ map is measuring the quality of the brain signal for each sensor, and it takes into account movement, noise, signal amplitude, and many other parameters that make it much more sensitive. It is totally normal for the EQ to flicker when you move. You can continue your recording but you have to take into account that part of the EEG data is muscle movement.

 

[Espinar Simon Martin]

Hello luckham jerill,

New user here. I am using a saline epoc flex cap and I’m having the same problem. First I made sure the CQ was all good and it reached 100%, all green. Then I checked the EQ and it was also got to 100%, all green. But during the recording, the EQ was fluctuating randomly without the subject moving at all and perfect CQ. Out of a 10 minute recording, no more than 25% of the time the EQ was 100%. BTW I was using the usb dongle with the extension cord for best quality. I wonder if there is any utility to edit out the parts below 100% for each channel, or do you expect users to do their own editing?

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