For the FOR measurement, the head-tracking feature of the HMD was turned on to ensure that the participant’s view of the screen changed in accordance with head rotation. Participants were asked to move the head to detect a target as quickly as possible. The FOR measurement was obtained from 90 trials where 90 targets were randomly presented on a 9 × 5 × 2 (horizontal × vertical × radial) spherical coordinate system (Fig. 1b; horizontal: 120°, vertical: 60°; near–far positions in the radial direction). Each target in the FOPR test was located at an interval distance of 15° from the centre of the screen.
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