Inquiry about EEG Signal Quality Instability

[Escobar María del Carmen]

Hi! I am using the EPOC+ headset for my research and have noticed that, although the EEG contact quality remains at 100%, the signal quality is very unstable, constantly fluctuating between values such as 100, 0, and 52. In my project, I am working with older adults who need to perform various activities on the computer for approximately 30 minutes, and for most of that time, the signal quality varies continuously. I would like to know if it is appropriate to analyze the EEG signals under these conditions or if this instability could affect the reliability of the results. If analysis is feasible, what would be the minimum recommended signal quality percentage to ensure reliable data processing?

[Singh Ravindra]

Unstable signal quality can affect EEG data reliability despite 100% contact quality. Aim for at least 85-90% stable signal quality for accurate analysis. Check electrode hydration, minimize movement, and reduce interference for better stability.

[Escobar María del Carmen]

Thank you for your helpful responses to my previous questions. I really appreciate the support.

I have another question regarding my EPOC+ headset:

I’m using the Emotiv EPOC+ with EmotivPro for research, but consistently experience poor EEG signal quality (typically below 50% stability) despite:

• Proper headset adjustment
• Adequate electrode moistening (using saline solution)
• Minimizing environmental interference

My specific questions are:

1. Could Bluetooth interference be the primary culprit? While I understand wireless signals can affect performance, I’m unsure to what degree.
2. Is there a wired USB connection option for the EPOC+ to potentially improve signal stability? Currently using it wirelessly. If available:
   • What hardware/adapters are needed?
   • What EmotivPro settings should be adjusted?

[Author]

Posts