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Experiment Description:

\n\n

This experiment involved 12 healthy subjects with no prior experience on neurofeedback or BCI, and without any known neurological disorders. All participants are right-handed, except one ambidextrous (participant #5). All participants have provided their signed informed consent for participating in the study in accordance with the 1964 Declaration of Helsinki.

\n\n

The experiment had been conducted in a laboratory environment under controlled conditions. The subjects went through three sessions lasting maximum two hours, during three consecutive days and each day at approximately at the same hour.

\n\n

During each session, participants underwent three different conditions. The first condition was always the ”resting-state”: the user was asked to keep the eyes open for two minutes staring at a screen with a green cross and a red arrow pointing up, and then closed for the other two minutes. After this, two more conditions followed related to a Motor Imagery (MI) task performed in a randomized order between left|right-hand movement. The two MI conditions consisted of two phases each: a training phase and a test phase. The general experimental routine for both of them was the same: each trial lasted 6 seconds (2 seconds baseline and 4 seconds MI), forewarned by the appearance of a green cross on the screen and a concomitant beep-sound a second before the onset of the task.

\n\n

Then, an arrow was appearing pointing left or right, and the subject had to imagine the movement of the corresponding arm reaching an object in front of the Baxter Robot (Rethink Robotics, Bochum, Germany). For both phases, 20 trials from left and 20 trials for right MI were generated in a randomized order, for a total of 40 trials. Finally, there was an inter-trial interval that extended randomly between 1.5 and 3.5 seconds.

\n\n

Overall, this study resulted into 180 EEG datasets.

\n\n

 

\n\n

Data Description:

\n\n\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
Data FormatGeneral Data Format (GDF)
Sampling Rate250 Hz
Channels32 EEG + 3 ACC.
EEG systemLiveAmp 32 with active electrodes actiCAP (Brain Products GmbH, Gilching, Germany)
\n\n

 

\n\n

Events:

\n\n\n\t\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
 
CodeDescription
32775Baseline Start
32776Baseline Stop
768Start of Trial, Trigger at t=0s
786Cross on screen (BCI experiment)
33282Beep
769class1, Left hand    - cue onset
770class2, Right hand    - cue onset
781Feedback (continuous) - onset
800End Of Trial
1010End Of Session
33281Train
32770Experiment Stop
\n\n

 

\n\n

Directory Tree:

\n\n

ROOT
\n| chanlocs.locs
\n|
\n|
\n+--- USER #
\n|            +---SESSION #
\n|            |            +---CONDITION #
\n|            |            |            \\---RESTING_STATE
\n|            |            |            +---1st_PERSON
\n|            |            |             |           TRAINING
\n|            |            |             |           ONLINE
\n|            |            |            +---3rd_PERSON
\n|            |            |             |           TRAINING
\n|            |            |             |           ONLINE

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