<p>Depending on whom you ask, you get both answers. That's mostly dependent on the denoising algorithm. If you're using an adaption of <a href="http://web.ics.purdue.edu/~wwtung/2010_GaoSultanHuTung.pdf" rel="nofollow noreferrer">GST</a>, you are segmenting first with an n-1 overlap.</p>

<p>If you're using <a href="http://www.sciencedirect.com/science/article/pii/S105381191100139X" rel="nofollow noreferrer">S3P</a> I'd recommend not segmenting, since (in my experience) there is a slight difference, with unsegmented data having slightly closer results to <a href="https://www.ncbi.nlm.nih.gov/pubmed/14643218" rel="nofollow noreferrer">Fernandez and Li, 2003</a> and <a href="https://www.ncbi.nlm.nih.gov/pubmed/11722164" rel="nofollow noreferrer">Frangakis and Hegerl, 2001</a>.</p>

CC BY-SA 3.0
2017-12-04T12:36:41.267Z
Thanks for your answer. Could you expand your references (I mean, write them in full?)
AliceD
CC BY-SA 3.0
2017-12-04T13:28:01.433Z
Thanks for your answer @Doc_Dormicum. For my denoising i only uses a simple 4th order high-pass Butterworth filter.
maia
CC BY-SA 3.0
2017-12-04T12:30:46.177Z
2017-12-05T09:55:38.297Z
2017-12-05T09:55:38.297Z
Doc_Dormicum
<p>Because of EEG nature, in EEG analysis often researcher use Windowing/segmentation method.    </p>

<p>As i currently work on sleep study, and in my study i need to analysis EEG data, i came to a problem.  </p>

<p><strong>My problem:</strong> should i filter and Denise my EEG signal and then segment it or no i should firstly segment my EEG and then filter and denoise each epoch separately?    </p>

<p>And as extra question, is there any difference between these two in signal processing view?</p>

<eeg><signal-processing>
EEG segmentation and denoising which one should done first?
maia
# EEG segmentation and denoising which one should done first?

(Asked by: username_0 on 2017-12-03)

Because of EEG nature, in EEG analysis often researcher use Windowing/segmentation method.

As i currently work on sleep study, and in my study i need to analysis EEG data, i came to a problem.

**My problem:** should i filter and Denise my EEG signal and then segment it or no i should firstly segment my EEG and then filter and denoise each epoch separately?

And as extra question, is there any difference between these two in signal processing view?

**Tags:** eeg, signal-processing


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## 1 answers

### Answer by username_1 on 2017-12-04. Score: 2

Depending on whom you ask, you get both answers. That's mostly dependent on the denoising algorithm. If you're using an adaption of [GST](http://web.ics.purdue.edu/~wwtung/2010_GaoSultanHuTung.pdf), you are segmenting first with an n-1 overlap.

If you're using [S3P](http://www.sciencedirect.com/science/article/pii/S105381191100139X) I'd recommend not segmenting, since (in my experience) there is a slight difference, with unsegmented data having slightly closer results to [Fernandez and Li, 2003](https://www.ncbi.nlm.nih.gov/pubmed/14643218) and [Frangakis and Hegerl, 2001](https://www.ncbi.nlm.nih.gov/pubmed/11722164).

> **Comments:**
> **username_2**: Thanks for your answer. Could you expand your references (I mean, write them in full?)  
> **username_0**: Thanks for your answer @username_1. For my denoising i only uses a simple 4th order high-pass Butterworth filter.  

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