[Eeglablist] Running the ADJUST Algorithm When We Have Partial Coverage of the Brain

[Marco Buiatti]

Dear Sanaz,

if you want to use ICA for artifact removal, you need to feed ICA with
sufficient spatial information to obtain an efficient identification of the
artifacts. Since the main artifacts that you can identify with ICA are
ocular artifacts, which mostly emerge on frontal electrodes, by removing
these electrodes you are asking a very difficult task to ICA and ADJUST (or
any other artifact removal algorithm).

My advice is to keep as many frontal electrodes as possible for this task.
You might just remove the most peripheral channels if they are
systematically noisy. Once you have completed the preprocessing, you can
focus on a subset of channels.

Hope this helps,

Best,

Marco



On Wed, 13 May 2020 at 17:27, Sanaz Khosravani <khosr023 at umn.edu> wrote:

> Thank you so much for your help. We have one more follow-up question if
> possible.
>
> In essence, in our preprocessing pipeline and before running the ICA, we
> apply common-averaging, as was recommended in Makoto's preprocessing
> pipeline, and the main reason we intend to focus only on our 50 channels of
> interest (covering central-parietal areas) even during preprocessing, is to
> avoid other potentially noisy channels that may exist in other brain
> regions.
>
> Now that you stated the ADJUST algorithm requires coverage of other brain
> areas as well, we had an idea to solve this issue:
> We thought about only focusing on our 50 channels of interest throughout
> the preprocessing pipeline (including the common-averaging step). Then,
> only for the purpose of running the ICA which is followed by the
> application of the ADJUST, we would include some frontal area electrodes,
> so that the algorithm can refer to these channels for the identification of
> artifacts.
>
> Could you please let us know your opinion on this? and whether you might
> have any recommendations on how many channels to include from frontal areas
> for running the ICA analysis?
>
> Thank you so much for your help.
>
>
>
>
>
>
>

-- 
Marco Buiatti

Neonatal Neuroimaging Unit
Center for Mind/Brain Sciences
University of Trento,
Piazza della Manifattura 1, 38068 Rovereto (TN), Italy
E-mail: marco.buiatti at unitn.it
Phone: +39 0464-808178
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