# How excluding rejected epochs by Autoreject before ICA do not effect EOG?

**URL:** <https://mne.discourse.group/t/how-excluding-rejected-epochs-by-autoreject-before-ica-do-not-effect-eog/6389>\
**Category:** Support & Discussions\
**Tags:** preprocessing, ica, autoreject\
**Created:** [February 21, 2023, 7:27am UTC](https://mne.discourse.group/t/how-excluding-rejected-epochs-by-autoreject-before-ica-do-not-effect-eog/6389 "2023-02-21T07:27:44Z")\
**Posts on this page:** 1\
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**Author:** ![aliosia](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/aliosia/32/2275_2.png) [@aliosia](https://mne.discourse.group/u/aliosia)\
**Post date:** [February 21, 2023, 9:43am UTC](https://mne.discourse.group/t/how-excluding-rejected-epochs-by-autoreject-before-ica-do-not-effect-eog/6389/5 "2023-02-21T09:43:38Z")

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I totally agree with your idea on applying global autoreject before ICA or simply applying PTP and excluding large artifacts. However, the autoreject example and both of the threads that I mentioned suggest local autoreject before ICA and I don’t know why, so I get confused.

In the example we have:

> We recommend that you first highpass filter the data, then run autoreject (local) and supply the bad epochs detected by it to the ICA algorithm for a robust fit, and finally run autoreject (local) again.

Also take a look at the followings:

> [@EEG processing pipeline with autoreject](https://mne.discourse.group/t/eeg-processing-pipeline-with-autoreject/3443/2):
>
> In fact, it appears that using autoreject “local” before and after ICA is in fact a good choice – we were seeing some issues with autoreject “global” before ICA in EEG layouts with some electrodes placed close to the eyes, like Fp1/Fp2.

> [@EEG processing pipeline with autoreject](https://mne.discourse.group/t/eeg-processing-pipeline-with-autoreject/3443/3):
>
> Local autoreject before ICA seems to work better than global autoreject. If you’re lazy, you could also just use a high threshold like 500 uV pre-ICA.

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