Resumo

CAICEDO BRAVO, Eduardo Francisco  e  CARDONA ARISTIZABAL, Jaiber Evelio. Steady state visually evoked potentials based Brain computer interface test outside the lab. Tecnura [online]. 2016, vol.20, n.48, pp.41-52. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2016.2.a03.

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.

Palavras-chave : BCI; Brain Computer Interface; MEC; Minimum Energy Combination; SSVEP; Steady State Visually Evoked Potentials.

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