# Is there a way to reject epochs based on maximum/minimum amplitude?

**URL:** <https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263>\
**Category:** Support & Discussions\
**Tags:** preprocessing, epochs\
**Created:** [July 19, 2023, 9:56pm UTC](https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263 "2023-07-19T21:56:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![withmywoessner](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/withmywoessner/32/3434_2.png) [@withmywoessner](https://mne.discourse.group/u/withmywoessner)\
**Post date:** [July 19, 2023, 9:56pm UTC](https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263/1 "2023-07-19T21:56:51Z")

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Hello! I just had a quick question. Is there a way to reject epochs based on maximum/minimum amplitudes? I am trying to recreate a script from other software in mne. I know that mne provides an option to reject based on peak-to-peak signal amplitude (PTP), but I was wondering if there was another option to reject just based on absolute amplitude. Thanks!

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [July 20, 2023, 9:12am UTC](https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263/2 "2023-07-20T09:12:30Z")

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Hello, there is no easy way to do this just yet, but this is on our roadmap.

Best wishes,  
Richard

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**Author:** ![withmywoessner](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/withmywoessner/32/3434_2.png) [@withmywoessner](https://mne.discourse.group/u/withmywoessner)\
**Post date:** [July 20, 2023, 11:29am UTC](https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263/3 "2023-07-20T11:29:40Z")

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Hello @richard! Is this something I could help with? Or would it be difficult since it involves modifying a core class of mne.

Thanks!

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [July 20, 2023, 12:13pm UTC](https://mne.discourse.group/t/is-there-a-way-to-reject-epochs-based-on-maximum-minimum-amplitude/7263/4 "2023-07-20T12:13:16Z")

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We’re keeping track of this here:

> <https://github.com/mne-tools/mne-python/issues/11775>
>
> The main use case is to do channel rejection based on standard deviations or abs…olute peak values (not \*peak-to-peak\* values, which is what we do currently)
> 
> This has come up a few times, e.g. here: 
> https://mne.discourse.group/t/epoch-rejection-according-to-deviation-from-mean/2980

I suppose you could reach out do @drammock if you’re interested in working on this!

Best wishes,  
Richard