Immersive virtual reality–based line bisection test

In the ILBT, the subject operates a controller in a VR space to bisect a line segment displayed on a whiteboard (fig 1C). The subject pulled the trigger of the controller with the index finger of the dominant hand to draw a line. In our system, the distance from the subject's acromion to the third metacarpal head was defined as the distance of NS (DNS) and the farther distance as the distance of MDS. Line segments on the whiteboard were displayed in sequence at 8 distances (0.25 m, 0.50 m, DNS, 1.00 m, 2DNS, 2.00 m, 3.00 m, 4.00 m) from NS to MDS at the front, center, and eye level of the subject. The size of the whiteboard displayed in the VR space was 0.297 m in horizontal length and 0.210 m in vertical length, with line segments of 0.200 m in length and 0.002 m in thickness, which are proportional to the distance. When the measurement distance was changed, the display was darkened for 1 second to wash out the line of sight.