The DREAMS K-complexes Database

Stéphanie DEVUYST
Université de Mons
Faculté Polytechnique de Mons - TCTS Lab
31, Boulevard Dolez
B-7000 Mons (Belgium)
ph : +32 (65) 37.47.20
fax: +32 (65) 37.47.29

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This K-complexes database was collected during the DREAMS project, to tune, train and test our automatic detection algorithms.

It consist of 10 excerpts of 30 minutes of central EEG channel (extracted from whole-night PSG recordings), annotated independently by two experts in K-complexes.

In order to facilitate future research and performance comparision, we decided to publish these data on Internet. Be simply aware that this DREAMS K-complexes Database of University of MONS - TCTS Laboratory (Stéphanie Devuyst, Thierry Dutoit) and Université Libre de Bruxelles - CHU de Charleroi Sleep Laboratory (Myriam Kerkhofs) is under terms of the Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0) License. Each use of this database and/or its content must be attributed to University of MONS - TCTS Laboratory (Stéphanie Devuyst, Thierry Dutoit) and Université Libre de Bruxelles - CHU de Charleroi Sleep Laboratory (Myriam Kerkhofs). Any other additional authorisations may be asked to

If you are interested in adding your own visual or automatic annotations, please contact me:

Database description

Data were acquired in a sleep laboratory of a belgium hospital using a digital 32-channel polygraph (BrainnetTM System of MEDATEC, Brussels, Belgium). They consist of 10 polysomnographic recordings coming from healthy subjects. Two EOG channels (P8-A1, P18-A1), three EEG channels (CZ-A1 or C3-A1, FP1-A1 and O1-A1) and one submental EMG channel were recorded. The standard European Data Format (EDF) was used for storing. The sampling frequency was 200Hz. A segment of 30 minutes of the central EEG channel was extracted from each whole-night recording for K-complexes scoring. These excerpts were given independently to two experts with the following recommendation regarding this annotation:
- K-complex must be a biphasic wave composed of a first negative sharp wave immediately followed by a slower positive component.
- It can occur isolated or by pair.
- It can be associated with spindles (before, after, or on it).
- Its duration should be at least 0.5s and no more than 1.5s.
- Its amplitude should be at least twice as high as the EEG background.
- The amplitude of the negative component should be at least 50% of the positive amplitude component.
- The minimum interval between successive K-complexes in slow wave sleep should be greater than 2s.
The corresponding whole night recordings were also previously scored in sleep stages according to the Rechtschaffen and Kales criteria, but no note of these stages quotations was given to the scorers. Unfortynately, the second expert has only annotated the first five excerpts.

Name Sampling frequency Age Sex Time of the excerpt
(from the begining of the recording)
Annoted channel Nr. of K-complexes scored by expert1 Nr. of K-complexes scored by expert2
excerpt1 200Hz 20 Man extracted from 02:00:00 to 02:30:00 CZ-A1 34 19
excerpt2 200Hz 23 Woman extracted from 05:00:30 to 05:30:30 CZ-A1 45 8
excerpt3 200Hz 47 Woman extracted from 06:06:00 to 06:36:00 CZ-A1 12 3
excerpt4 200Hz 24 Woman extracted from 01:16:00 to 01:46:00 CZ-A1 78 14
excerpt5 200Hz 23 Woman extracted from 07:15:00 to 07:45:00 CZ-A1 39 20
excerpt6 200Hz 23 Man extracted from 00:10:00 to 00:40:00 CZ-A1 28 /
excerpt7 200Hz 27 Man extracted from 02:20:00 to 02:50:00 CZ-A1 11 /
excerpt8 200Hz 46 Woman extracted from 04:50:00 to 05:20:00 CZ-A1 4 /
excerpt9 200Hz 27 Man extracted from 05:30:00 to 06:00:00 CZ-A1 5 /
excerpt10 200Hz 21 Woman extracted from 02:30:00 to 03:00:00 CZ-A1 16 /

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File format

Six files are available per excerpt (except for the five last excerpts, for which visual scoring 2 is absent):

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Database download

You can download each file separately by doing "right-click" and "save target as" on the links below (in the table),
or you can directly download the entire database by clicking on this link: DatabaseKcomplexes.rar

EDF Central EEG Automatic detection Visual scoring 1 Visual scoring 2 Hypnogram
excerpt1.edf excerpt1.txt Automatic_detection_excerpt1.txt Visual_scoring1_excerpt1.txt Visual_scoring2_excerpt1.txt Hypnogram_excerpt1.txt
excerpt2.edf excerpt2.txt Automatic_detection_excerpt2.txt Visual_scoring1_excerpt2.txt Visual_scoring2_excerpt2.txt Hypnogram_excerpt2.txt
excerpt3.edf excerpt3.txt Automatic_detection_excerpt3.txt Visual_scoring1_excerpt3.txt Visual_scoring2_excerpt3.txt Hypnogram_excerpt3.txt
excerpt4.edf excerpt4.txt Automatic_detection_excerpt4.txt Visual_scoring1_excerpt4.txt Visual_scoring2_excerpt4.txt Hypnogram_excerpt4.txt
excerpt5.edf excerpt5.txt Automatic_detection_excerpt5.txt Visual_scoring1_excerpt5.txt Visual_scoring2_excerpt5.txt Hypnogram_excerpt5.txt
excerpt6.edf excerpt6.txt Automatic_detection_excerpt6.txt Visual_scoring1_excerpt6.txt Not available Hypnogram_excerpt6.txt
excerpt7.edf excerpt7.txt Automatic_detection_excerpt7.txt Visual_scoring1_excerpt7.txt Not available Hypnogram_excerpt7.txt
excerpt8.edf excerpt8.txt Automatic_detection_excerpt8.txt Visual_scoring1_excerpt8.txt Not available Hypnogram_excerpt8.txt
excerpt9.edf excerpt9.txt Automatic_detection_excerpt9.txt Visual_scoring1_excerpt9.txt Not available Hypnogram_excerpt9.txt
excerpt10.edf excerpt10.txt Automatic_detection_excerpt10.txt Visual_scoring1_excerpt10.txt Not available Hypnogram_excerpt10.txt

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