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Notes
| Data acquisition
For EEG data recording a 64-channeled ActiChamp amplifier system (Brain Products GmbH, Gliching, Germany) was used with an actiCAP EEG cap, following the 10-20 international convention. POz was used as the reference electrode, therefore 63 electrodes were available for data acquisition. During the experimental preparation, the impedance of the EEG electrodes was measured and kept under 30kΩ, and its impedance value was saved with the recorded EEG files.
Subjects were seated in front of an LG Flatron L204WT-SF 20'' Wide LCD monitor at a viewing distance of about 70-130 cm. For the experimental location, we used rooms equipped with Faraday cage shielding, but also regular rooms without electrical shielding. With the use of the regular, unshielded room we aimed to create a similar environment as it would be present in the Cybathlon competition.
The raw EEG signals were recorded with the BrainVision Recorder program (version: 1.22.0001) without additional software or hardware filters.
TTK Paradigm  All tasks are separated with a 3-second long resting period. A specific paradigm can be conducted by defining concrete MI tasks. The GoPar starts with an introduction session, where 1-minute-long eyes open and 1-minute-long eyes closed tasks are required. Then, it is followed by two warmup sessions, where the MI movements are practiced. In each warmup session, 2 tasks are selected and presented four times to the experimental subject in a randomized order. For each task first, a 4-second long overt movement is required which is followed by a 4-second long covert movement. The General Offline Paradigm concludes with 10 MI sessions. In one MI session, 4-second-long MI tasks are required. Each task is repeated four times and the order of the task is randomized. Our TTK Paradigm can be conducted by making the assignment indicated in the right of the figure.
Triggers
- Rest
- Eyes-open
- Eyes-closed
- Right hand - Real
- Right hand - Imagined
- Left hand - Real
- Left hand - Imagined
- Right foot - Real
- Right foot - Imagined
- Left foot - Real
- Left foot - Imagined
- Session end
- Task end
- Paradigm start
- Paradigm end
- Session start
- Abort Experiment
Subjects - Experiments Each experimental subject could participate in the experiments multiple days. However in the filename conversion the subject number means the different experimental days. The following list gives the matching between subjects and experimental days.
- A - [1, 10, 19]
- B - [2]
- C - [3, 11, 23]
- D - [4, 6, 8]
- E - [5, 7, 17, 21]
- F - [9, 12, 13, 14, 20]
- G - [15, 16, 18, 22]
- H - [24]
- I - [25]
Raw signals (*.vhdr files)
The raw signals are presented in the original BrainProducts .vhdr format, as it were recorded, including pauses between the experimental sessions, ect.. If an experiment were aborted then multiple files were created.
Standardized signals (*_raw.fif files)
These files are only includes the Motor-Imagery sessions form each task and each file represents one session. The Intro period and the warmup sessions are omitted. These files can be easily opened with the python package, called MNE tool.
We are suggesting to use this version of the dataset!
Ethical Permit
This study was carried out following the Declaration of Helsinki and national guidelines with written informed consent obtained from all subjects. The study was approved by the United Ethical Review Committee for Research in Psychology (EPKEB reference number: 2018-54).
Before each experiment, each subject was informed about the course of the experiment, and a statement of consent was signed. |
