# All Epochs are dropped

**URL:** https://mne.discourse.group/t/all-epochs-are-dropped/5486
**Category:** Support & Discussions
**Tags:** eeg, epochs
**Created:** [August 30, 2022, 2:39am UTC](https://mne.discourse.group/t/all-epochs-are-dropped/5486 "2022-08-30T02:39:07Z")
**Posts on this page:** 1
**Showing post:** 8

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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: [August 30, 2022, 7:47pm UTC](https://mne.discourse.group/t/all-epochs-are-dropped/5486/8 "2022-08-30T19:47:34Z")

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> [@sds](#):
>
> What is a good value for reject?

It really depends on your data and the recording system used. We usually pick quite large values to only capture sudden “spikes” in the signal, which would e.g. throw off ICA. Something like `{"eeg": 500e-6}` might be a good start. Be sure to look at `epochs.plot_drop_log()` output to figure out if and which individual channels contribute to rejections.

For flatness, I don’t usually do rejection…

The function [`mne.preprocessing.annotate_amplitude()`](https://mne.tools/stable/generated/mne.preprocessing.annotate_amplitude.html) might also be of interest to you. It operates on continuous data.

Best wishes,  
Richard

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