High-Speed Spelling in Virtual Reality with Sequential Hybrid BCIs

Zhaolin YAO  Xinyao MA  Yijun WANG  Xu ZHANG  Ming LIU  Weihua PEI  Hongda CHEN  

IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.11   pp.2859-2862
Publication Date: 2018/11/01
Publicized: 2018/07/25
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2018EDL8122
Type of Manuscript: LETTER
Category: Biological Engineering
brain-computer interface,  steady-state visual evoked potentials,  eye tracking,  virtual reality,  speller,  

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A new hybrid brain-computer interface (BCI), which is based on sequential controls by eye tracking and steady-state visual evoked potentials (SSVEPs), has been proposed for high-speed spelling in virtual reality (VR) with a 40-target virtual keyboard. During target selection, gaze point was first detected by an eye-tracking accessory. A 4-target block was then selected for further target selection by a 4-class SSVEP BCI. The system can type at a speed of 1.25 character/sec in a cue-guided target selection task. Online experiments on three subjects achieved an averaged information transfer rate (ITR) of 360.7 bits/min.