Forum General General questions and discussions Some information regarding edf file

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  • #644
    kumar Raj
    Participant
    @rajkrsaini-60e46fecdf4c0

    Hi, in the manual, I can see the following information
    CQ_AF3…CQ_AF4
    These numbers show the color of the CQ Map indicators, where 0=BLACK, 1 =RED, 2=ORANGE, 3=YELLOW, 4=GREEN.

    I have doubts
    1. does BLACK or ZERO(0) mean that a particular electrode is not receiving data as it is not properly adjusted or not working

    for example, CQ_T7 is always zero (black), what does it mean?

    #645
    luckham jerill
    Participant
    @starex12-6058fa0f16135

    Thank you for your question.

    Contact Quality (CQ) is an impedance measurement that indicates the quality of the electrical signal passing through the sensors and the reference. It can be one of 4 values: 0 – very bad (black), 1 – bad (red), 2 – ok (orange) and 4 – good (green). If you have black sensors, it means the electrodes are not pickup electrical signals as it is not properly adjusted or very noisy. (https://emotiv.gitbook.io/cortex-manual/setting_up_your_eeg_device/view_contact_quality_map/contact-quality-cq-vs.-eeg-quality-eq)

    If you have other questions, please let us know.

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