EEG Quality

[Riffnaller-Schiefer Andreas]

Hi,

I have  problems with the EEG Quality: Sometimes it is 100% for half a minute or so, but then suddenly it falls down to 0% even though the contact quality is still 100%, I am not moving or anything like that …. It then takes a while to get back to 100%. This is really annoying… I am using a MacBook Pro (2018) and I am using the built in bluetooth of it… Anybody that has an advice for me?

[luckham jerill]

Hi Andreas,

Thank you for your question.

EEG Quality (EQ) has been built to give you an easy way to assess whether you are recording high-quality brain signals or not. Basically, it is a scoring system for the quality of the signal in each sensor.  It is not meant to stay at 100% all the time.  If you have a lot of movement (artefact) this will affect the EEG quality, when you have other wireless /bluetooth devices near the headset, this can also cause noise and affect the EEG quality.

I have also had this experience with my EPOC X headset.  It helps to add more saline, yes.  Also try to keep still for about 10 seconds and you will see that the EEG quality score will remain good, because there not so many movements. But if you start moving your arms, like to adjust headset or type, it will drop the again.  If you can have someone help with working the computer so the wearer of the headset can avoid moving. You can still do your recording despite the fluctuating EEG Quality score. You just need to account for the artefacts and noise when processing your data.

If you have other questions, please let me know.

[Godwin Taylor]

I have had the same issue. The problem is that it starts at 100 (and yes, it does fluctuate slightly) and then after a minute or two, it rapidly falls to 0% – 18% regardless of the connection quality or the addition of saline. I am remaining still for way longer than 10 seconds. I could sit still for a solid minute and it wouldnt get any better. I am also using a macbook (2020 M1). Are there any other suggestions for correcting this issue?

[luckham jerill]

Hello Godwin,

 

Thank you for your post.  Kindly contact support directly through our email – support@emotiv.com.  We will be requesting a sample .csv  file with about 3-4 minute recording. Kindly email as well the software you are using and the version.  We look forward to your follow-up.

 

[luckham jerill]

@Godwin,  You mentioned you are using Mac, so are you using a USB adapter to plug the USB dongle into it? If yes, the USB adapter might be causing the fluatuations.

 

[Carriquiry Joaquin Matias]

Having the same issue with Emotiv Insight using Windows. Even with shaved head and saline solution. EQ suddenly drops to 0% and only stays at 100% for a few seconds. After drops to 0% is really hard to get it up from there

[Author]

Posts