<p>I recently start to work on sleep study.<br>
For my research i download sleep EEG data from physionet. The EEG data has 100 HZ sampling rate and was recorded from 2 bipolar EEG site.  </p>

<p>When i start the preprocessing stage, i encounter a simple problem, <strong>how should i know if my signal has an artifact or noise?</strong> </p>

<p>It should be noted, based on nyquist theorem and my signal's sampling rate, the maximum frequency of my signal is 50 HZ, so i did not filter unnecessary EEG frequency.<br>
In general i only used a simple notch filter at 50 HZ, and used simple threshold method in order to remove the epochs that were grossly contaminated by muscle and/or eye movement artifacts. </p>

<p>Back to the main question, how should i know if i need to uses more complicated method for removing EMG or EOG artifact from my signal?  </p>

<eeg><signal-processing>
How do I determine whether my EEG signal needs denoising?
maia
# How do I determine whether my EEG signal needs denoising?

(Asked by: username_0 on 2017-12-02)

I recently start to work on sleep study.  
For my research i download sleep EEG data from physionet. The EEG data has 100 HZ sampling rate and was recorded from 2 bipolar EEG site.

When i start the preprocessing stage, i encounter a simple problem, **how should i know if my signal has an artifact or noise?**

It should be noted, based on nyquist theorem and my signal's sampling rate, the maximum frequency of my signal is 50 HZ, so i did not filter unnecessary EEG frequency.  
In general i only used a simple notch filter at 50 HZ, and used simple threshold method in order to remove the epochs that were grossly contaminated by muscle and/or eye movement artifacts.

Back to the main question, how should i know if i need to uses more complicated method for removing EMG or EOG artifact from my signal?

**Tags:** eeg, signal-processing


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## 0 answers

