[Eeglablist] Artifact Subspace Reconstruction (ASR)

[bpm at uvic.ca]

Hello Makoto and Christian,

Thanks very much for the response!

-Bryce.


Subject:
Re: [Eeglablist] Artifact Subspace Reconstruction (ASR)
From:
Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
Date:
14-10-16 07:58 PM

To:
Christian Kothe <christiankothe at gmail.com>
CC:
EEGLAB List <eeglablist at sccn.ucsd.edu>, "bpm at uvic.ca" <bpm at uvic.ca>


That makes perfect sense to me Christian. Thanks! It is very informative.

Makoto

On Thu, Oct 16, 2014 at 4:25 PM, Christian Kothe 
<christiankothe at gmail.com <mailto:christiankothe at gmail.com>> wrote:

    Hi Bryce,

    there is no serious need to adjust any parameter for low-density
    systems this one.

    However, if you enjoy tuning things, there is a limit on what number
    of artifact components it will maximally remove at a given time
    point, and that number is a fraction of the number of channels
    (MaxDimensions in clean_asr, default 0.66). So for your 11 channels
    that's 7 components. If you work in a situation where you face more
    simultaneous artifacts than that (e.g., muscle groups) and you
    absolutely have to remove all of them, then you may increase that
    number. However, note that if you remove 7 degrees of freedom from
    your data and have 4 left, you will end up with a rather
    impoverished EEG segment in any case (rank-deficient); for offline
    analysis is might be better to have such bad windows removed from
    the data altogether and therefore leave that setting at its defaults
    -- the clean_rawdata plugin will by default remove incompletely
    repaired windows in a final post-process.

    Christian

    On Thu, Oct 16, 2014 at 4:12 PM, Makoto Miyakoshi
    <mmiyakoshi at ucsd.edu <mailto:mmiyakoshi at ucsd.edu>> wrote:

        Dear Christian,

        Should clean_rawdata parameter adjusted from default if you have
        only 14 channels?

        Makoto

        On Wed, Oct 15, 2014 at 10:13 PM, bpm at uvic.ca
        <mailto:bpm at uvic.ca> <bpm at uvic.ca <mailto:bpm at uvic.ca>> wrote:

            Greetings,

            I am looking at low-density (11 scalp channels, 3 ocular
            channels) resting EEG recordings for a longitudinal study. I
            have been experimenting with the Artifact Subspace
            Reconstruction extension for cleaning my data, which seems
            to be working well enough using the default input parameter
            settings. I cannot find any documentation for ASR and was
            wondering if perhaps I should be tweaking the input settings
            because of my low-density array.

            Thank you for any responses!

            -Bryce.

            -- 
            Bryce P Mulligan
            Clinical Neuropsychology Doctoral Student
            Neuropsychology & Rehabilitation Laboratory
            Department of Psychology
            P.O. Box 1700 STN CSC
            University of Victoria
            Victoria BC Canada V8W 2Y2
            250-472-4194 <tel:250-472-4194>
            bpm at uvic.ca <mailto:bpm at uvic.ca>

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        -- 
        Makoto Miyakoshi
        Swartz Center for Computational Neuroscience
        Institute for Neural Computation, University of California San Diego


-- 
Bryce P Mulligan
Clinical Neuropsychology Doctoral Student
Neuropsychology & Rehabilitation Laboratory
Department of Psychology
P.O. Box 1700 STN CSC
University of Victoria
Victoria BC Canada V8W 2Y2
250-472-4194
bpm at uvic.ca

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