Figure 1From: Improvement of classification accuracy in a phase-tagged steady-state visual evoked potential-based brain computer interface using multiclass support vector machineBlock diagram and flickering sequences of our phase-tagged SSVEP-based BCI system. The system architecture of the system in (a). The four phase-tagged flickering sequences at 20 Hz, where the inter-stimulus phase delay was set at 90° (± 45° phase margin) in (b).Back to article page