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Steady state visually evoked potentials based Brain computer interface test outside the lab
Authors: Eduardo Francisco Caicedo Bravo, Jaiber Evelio Cardona Aristizábal
Number of views: 320
Context: Steady State Visually Evoked Potentials (SSVEP)
are brain signals which are one of the most promising
signals for Brain Computer Interfaces (BCIs)implementation, however, SSVEP based BCI generally
are proven in a controlled environment and there
are a few tests in demanding conditions.
Method: We present a SSVEP based BCI system that
was used outside the lab in a noisy environment
with distractions, and with the presence of public.
For the tests, we showed a maze in a laptop where
the user could move an avatar looking for a target
that is represented by a house. In order to move the
avatar, the volunteer must stare at one of the four visual
stimuli; the four visual stimuli represent the four
directions: right, up, left, and down. The system is
proven without any calibration procedure.
Results: 32 volunteers utilized the system and 20
achieved the target with an accuracy above 60%,
including 9 with an accuracy of 100%, 7 achieved
the target with an accuracy below 60% and 5 left
without achieving the goal. For the volunteers who
reached accuracy above 60%, the results of the performance
achieved an average of 6,4s for command
detections, precision of 79% and information transfer
rate (ITR) of 8,78 bits/s.
Conclusions: We showed a SSVEP based BCI system
with low cost, it was proved in a public event, it did
not have calibration procedures, it was easy to install,
and it was used for people in a wide age range.
The results show that it is possible to bring this kind
of systems to environments outside the laboratory