# mne\_browse\_raw

**URL:** <https://mne.discourse.group/t/mne-browse-raw/1127>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [November 30, 2016, 3:25pm UTC](https://mne.discourse.group/t/mne-browse-raw/1127 "2016-11-30T15:25:01Z")\
**Posts on this page:** 4\
**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:** [November 30, 2016, 3:25pm UTC](https://mne.discourse.group/t/mne-browse-raw/1127/1 "2016-11-30T15:25:01Z")

</div>

Hi Denis,

thks for your fast response!

> > RuntimeError: No clean segment found. Please consider updating your
> 
> rejection thresholds
> 
> It means that your reject parameters are too strict. You want to make sure  
> that data segments contaminated by strong environmental magnetic fields are  
> ignored, but you don't want to reject ECG or EOG since these need to be  
> kept in order to find corresponding components.

Thks, I supposed it was related to the reject dict and  
I wonder if I could get this thresholds by inspecting the data  
but with raw.plot() I didn't see the MEG field amplitudes o.O

I attached what I see by using raw.plot().

> > Try dict(mag=5e-12, grad=5000e-13)

I'll try with this dict!

Thks again!  
best  
Annalisa

---

<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:** [November 30, 2016, 9:02pm UTC](https://mne.discourse.group/t/mne-browse-raw/1127/2 "2016-11-30T21:02:37Z")

</div>

I see where you want to go. In my experience the values I recommended to  
you work pretty well on many data. Just take a look at average EOG/ECG  
artefact scales and then add some room above to make sure you don't reject  
data because of biological artifacts you intend to regress out using ICA.  
Have a look at the last section here:  
[http://martinos.org/mne/stable/auto\_tutorials/plot\_artifacts\_detection.html](http://martinos.org/mne/stable/auto_tutorials/plot_artifacts_detection.html)

Hope this helps,  
Denis

---

<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:** [November 30, 2016, 9:20pm UTC](https://mne.discourse.group/t/mne-browse-raw/1127/3 "2016-11-30T21:20:14Z")

</div>

Ciao Denis,

thks a lot, also for the useful links.  
I know quite well the webpage but I miss ever something 🙂

In my experience, the dict(mag=4e-12, grad=4000e-13)  
works well, it is the first time I met this problem.  
I'll look to this tutorial.

Thks again!  
best  
Annalisa

Denis-Alexander Engemann \<denis.engemann at [gmail.com](http://gmail.com)\> ha scritto:

---

<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:** [November 30, 2016, 9:24pm UTC](https://mne.discourse.group/t/mne-browse-raw/1127/4 "2016-11-30T21:24:10Z")

</div>

Certo, con piacere!

In my experience your values are a bit low, we typically use those for  
rejection of EOG/ECG. So this is not what you want because your ICA is  
supposed to learn EOG/ECG pattern by exposure to their corresponding  
topographies.

Best,  
Denis