  We study the performance of brain computer interface (BCI) system in a
virtual reality (VR) environment and compare it to 2D regular displays. First,
we design a headset that consists of three components: a wearable
electroencephalography (EEG) device, a VR headset and an interface. Recordings
of brain and behavior from human subjects, performing a wide variety of tasks
using our device are collected. The tasks consist of object rotation or scaling
in VR using either mental commands or facial expression (smile and eyebrow
movement). Subjects are asked to repeat similar tasks on regular 2D monitor
screens. The performance in 3-D virtual reality environment is considerably
higher compared to the to the 2D screen. Particularly, the median number of
success rate across trials for VR setting is double of that for the 2D setting
(8 successful command in VR setting compared to 4 successful command in 2D
screen in 1 minute trials). Our results suggest that the design of future BCI
systems can remarkably benefit from the VR setting.
