Olimex OpenEEG: Difference between revisions
From Polyphasic Sleep Wiki
No edit summary |
No edit summary |
||
| Line 154: | Line 154: | ||
== Sleep stage identification == | == Sleep stage identification == | ||
[[File:Sample Olimex data.jpg|thumb|Sleep stages in Olimex]] | |||
Follow the instructions in the section [[https://polysleep.org/wiki/Olimex_OpenEEG#Running_SleepEEGTools_to_mark_sleep|Running SleepEEGTools to mark sleep]] to launch the SleepEEGTools program and select a recording. This will open the marking window. From there, you can choose a sleep stage and click on different parts of the spectrogram to mark the stages manually. Once you're finished, click Save and Quit to store your annotations. | |||
If you're unsure about how to mark sleep stages or have atypical recordings, feel free to join our [https://discord.com/invite/2kzXcg7Juf Discord server] and ask for help from experienced community members. | |||
=== Sleep stages === | |||
As shown in the image, each sleep stage has a distinct pattern. With some practice, you'll be able to recognize these patterns and mark them accurately. | |||
==== Wake/NREM1 ==== | |||
These two stages can appear quite similar. The wake state typically looks blank or appears messy with high-frequency activity. NREM1 is also mostly blank, but usually with less high-frequency noise. | |||
==== NREM2/NREM3 ==== | |||
NREM2 ([https://en.wikipedia.org/wiki/Non-rapid_eye_movement_sleep#Stages light sleep]) and NREM3 ([https://en.wikipedia.org/wiki/Slow-wave_sleep slow-wave sleep]) are part of a continuum and are primarily differentiated by the amount of delta wave activity. In NREM2, delta waves are present but not dominant. NREM3 is characterized by a significant amount of delta activity, often exceeding 20% of the total brainwave activity.<ref name="nrem" /> | |||
Both NREM2 and NREM3 (SWS) show a bold frequency band between 10 and 15 Hz. This band is typically thicker in NREM2 and thinner in SWS. Additionally, SWS tends to show more intense low-frequency activity in the 0–10 Hz range. | |||
==== REM ==== | |||
REM sleep is usually easy to identify in the spectrogram, especially within the core of a sleep cycle. REM episodes occur between NREM stages and are marked by a distinctive bow-shaped frequency band around 20–25 Hz near the end of the cycle. | |||
== References == <!--T:3--> | == References == <!--T:3--> | ||
| Line 169: | Line 193: | ||
<ref name="skinprep">{{cite web |url=https://thephysiologist.org/study-materials/electrodes-and-interference/ |title=Electrodes and Skin Prep |website=The Student Physiologist |access-date=2025-06-21}}</ref> | <ref name="skinprep">{{cite web |url=https://thephysiologist.org/study-materials/electrodes-and-interference/ |title=Electrodes and Skin Prep |website=The Student Physiologist |access-date=2025-06-21}}</ref> | ||
<ref name="openvibedownload">{{cite web |url=https://openvibe.inria.fr/downloads/ |title=OpenViBE Downloads |website=OpenViBE |access-date=2025-06-21}}</ref> | <ref name="openvibedownload">{{cite web |url=https://openvibe.inria.fr/downloads/ |title=OpenViBE Downloads |website=OpenViBE |access-date=2025-06-21}}</ref> | ||
<ref name="nrem">{{cite web |url=https://neupsykey.com/introduction-to-sleep-and-polysomnography-3/ |title= | |||
Introduction to Sleep and Polysomnography |website=Neupsy Key |access-date=2025-06-22}}</ref> | |||
}} | }} | ||
