High-Speed Spelling in Virtual Reality with Sequential Hybrid BCIs

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

Publication
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
Keyword: 
brain-computer interface,  steady-state visual evoked potentials,  eye tracking,  virtual reality,  speller,  

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Summary: 
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.