BCI Competition 2008 – Graz data set B
R. Leeb
1
, C. Brunner
1
, G. R. M¨uller-Putz
1
, A. Schl¨ogl
2
, and G.
Pfurtscheller
1
1
Institute for Knowledge Discovery, Graz University of Technology,
Austria
2
Institute for Human-Computer Interfaces, Graz University of
Technology, Austria
Experimental paradigm
This data set consists of EEG data from 9 subjects of a study published in [1].
The subjects were right-handed, had normal or corrected-to-normal vision
and were paid for participating in the experiments. All volunteers were
sitting in an armchair, watching a flat screen monitor placed approximately
1 m away at eye level. For each subject 5 sessions are provided, whereby the
first two sessions contain training data without feedback (screening), and
the last three sessions were recorded with feedback.
Each session consists of several runs, illustrated in Figure 1. At the
beginning of each session, a recording of approximately 5 minutes was per-
formed to estimate the EOG influence. The recording was divided into 3
blocks: (1) two minutes with eyes open (looking at a fixation cross on the
screen), (2) one minute with eyes closed, and (3) one minute with eye move-
ments. The artifact block was divided into four sections (15 seconds artifacts
with 5 seconds resting in between) and the subjects were instructed with
a text on the monitor to perform either eye blinking, rolling, up-down or
left-right movements. At the beginning and at the end of each task a low
and high warning tone were presented, respectively. Note that due to tech-
nical problems no EOG block is available in session B0102T and B0504E, (see
Table 1 for a list of all subjects)
Figure 1: Timing scheme of one session (for screening and feedback sessions).
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