Using cEEGrid for trigeminal / jaw reflex electrophysiology

Frisardi56Frisardi56 Rome
in Cyton

Hello,

I am exploring the possibility of using OpenBCI cEEGrid together with Cyton + Daisy for advanced neurophysiological studies involving:

  • jaw jerk reflexes
  • trigeminal dynamics
  • silent period analysis
  • jaw clenching activity
  • peri-auricular EMG activity
  • multimodal electrophysiology

I would like to better understand the practical capabilities and limitations of cEEGrid in this context.

More specifically:

  1. Has cEEGrid ever been used for:
  • jaw muscle activity
  • trigeminal reflex studies
  • peri-auricular EMG
  • jaw clenching detection
  • facial or masticatory muscle recordings

  1. What is the practical frequency bandwidth of cEEGrid when used with Cyton/Daisy?

  2. Is the signal quality sufficient for short-latency reflex-related activity?

  3. Can cEEGrid be combined simultaneously with:

  • standard surface EMG
  • external trigger systems
  • piezoelectric reflex hammer synchronization
  • electrical stimulation paradigms
  1. Are there known limitations regarding:
  • muscle artifacts
  • stimulation artifacts
  • temporal precision
  • synchronization
  1. Has anyone attempted multimodal acquisition combining:
  • ear-centered EEG
  • facial EMG
  • trigeminal reflex timing
  • jaw activity

Thank you very much.

Comments

  • wjcroftwjcroft Mount Shasta, CA

    Frisardi, hi again.

    Michael Knierim is the developer and expert on the cEEGrid electrode system. I'm going to mention his profile here on the Forum: @MKnierim , hoping that he might pop in here with some experienced remarks. But if that does not happen, you can click on his blue name above and send him a direct message using the Message button at the upper right area of his Profile.

    Regards, William

  • MKnierimMKnierim Germany

    Hi Frisardi, William,
    happy to provide some information. First of all: yes, we have done some preliminary work on jaw clenching activity and peri- auricular EMG activity in general. In those works, differentiating different EMG patterns from cEEGrids worked quite well using a combination of feature engineering and simple machine learning models (like SVM, random forest, LDA):
    1. https://www.sciencedirect.com/science/article/pii/S246806722200102X
    2. https://link.springer.com/chapter/10.1007/978-3-030-88900-5_6
    3. https://link.springer.com/chapter/10.1007/978-3-030-80091-8_4
    4. https://www.nature.com/articles/s41598-025-16839-z

    If you use the cEEGrids with Cyton+Daisy, you typically work with 125Hz sampling rate, which will give you an effective frequency bandwith of ca. 1-60 Hz; If you'd use a Cyton only, that doubles to 1-125Hz because you can record with 250Hz sampling rate.

    Yes, with the cEEGrids you are working with gel - this should be sufficient for short-latency reflex-related activity in my opinion, although this may depend on what you consider as "short-latency". We have more details on timing precision with cEEGrids in this publication: https://www.mdpi.com/1424-8220/23/9/4559

    About the combination with other systems: That largely depends on the details. Multi-device EMG recordings should be possible as EMG is passive, so there should be no interference. The rest like trigger signals, etc. depends on your remaining software/hardware stack.

    Hope this helps? :)

    Best regards
    Michael

  • wjcroftwjcroft Mount Shasta, CA

    Michael @MKnierim , hey thanks so much for your detailed reply with research paper citations !

    Frisardi, reply on this thread if you have any followup questions. I also replied on your other thread regarding triggers / stimulators.

    Best regards, William

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