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  • #582
    Riffnaller-Schiefer Andreas
    Participant
    @tug-cgv-60985757b0f22

    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?

    #583
    luckham jerill
    Participant
    @starex12-6058fa0f16135

    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.

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