# Questions about running ICA and AutoReject

**URL:** <https://mne.discourse.group/t/questions-about-running-ica-and-autoreject/1719>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [January 23, 2019, 7:24pm UTC](https://mne.discourse.group/t/questions-about-running-ica-and-autoreject/1719 "2019-01-23T19:24:18Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [January 23, 2019, 7:24pm UTC](https://mne.discourse.group/t/questions-about-running-ica-and-autoreject/1719/1 "2019-01-23T19:24:18Z")

</div>

External Email - Use Caution

Hello Everyone,

I have few questions about artifact correction of EEG data using ICA and  
auto-reject:

1) Is is better to apply ICA on raw data or epoch data?

2) When to apply auto-reject? Before ICA or after ICA?

Any suggestion is highly appreciated.

Thank you very much

Best,  
Hemanth  
-------------- next part --------------  
An HTML attachment was scrubbed...  
URL: [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20190123/62990e9b/attachment.html](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20190123/62990e9b/attachment.html)

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [January 23, 2019, 9:23pm UTC](https://mne.discourse.group/t/questions-about-running-ica-and-autoreject/1719/2 "2019-01-23T21:23:16Z")

</div>

External Email - Use Caution

Hi Hemanth,

To answer your questions,

1) Applying ICA on raw data or epoched data should be completely equivalent  
since it's a spatial filter

2) This is a little subtle, so let me point you to the FAQ section of  
autoreject: [http://autoreject.github.io/faq.html](http://autoreject.github.io/faq.html)

Best,  
Mainak

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [January 24, 2019, 3:54pm UTC](https://mne.discourse.group/t/questions-about-running-ica-and-autoreject/1719/3 "2019-01-24T15:54:01Z")

</div>

External Email - Use Caution

Thank you for the information.

Best,  
Hemanth