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SSVEP
Amiri, Setare, et al. "A Review of P300, SSVEP, and Hybrid P300/SSVEP Brain-Computer Interface Systems." (2013).
SSVEP Frequency Chosen
an optimal signal-to-noise ratio (SNR) of the SSVEP can be usually achieved by stimulating in the 5–30 Hz range
the whole alpha band (6–13 Hz), and the early beta band (13–17 Hz) usually show better stimulus-related responses
minimize the inclusion of the mid-late beta (15–25 Hz) band because of its higher risk of inducing photoepileptic seizures
Parini, Sergio, et al. "A robust and self-paced BCI system based on a four class SSVEP paradigm: algorithms and protocols for a high-transfer-rate direct brain communication." Computational Intelligence and Neuroscience 2009 (2009).
Size
Google Glass Screen Resolution: 640 X 360
The pixels : 1/8th the physical width of those on the iPhone 5's retina display
Pattern Size : 5 -> 20