Table 1 Main parameters of interest for each of the iVR-based tasks
| Â | Far space | Near space |
|---|---|---|
Number, position, and detection time of detected/omitted targets; L-R difference of omitted targets | X | X |
Total and lateralized time of exploration, and L-R difference | X | X |
Ratio of exploration time (time spent on the right (left)/number of detected targets on same side) | X | X |
Time moving toward left and right direction (head gaze) | X | X |
Lateralized average and standard deviation of marking distance and time (i.e., the distance or time between 2 successively detected targets, correspondingly; Level 1 only) | X | Â |
Average and standard deviation of reaching time by column and side | Â | X |
Time required to reach a target (time-to-reach): time taken from target appearance to the moment the target disappears after being touched | Â | X |
Reaction time: time taken to move the hand ~ 2 cm in the direction of the target after target appearance |  | X |