Fig. 2.

Experimental paradigms and virtual world. (a) – (d) The colors correspond to the different phases of a trial: black dot for reset, green for search, blue for final approach, and red for success. Reset is the time the helicopter was motionless. Success was the time after fly through, but before the ring changed position. (a) Trial-based discrete paradigm. After successful completion, the helicopter reset to the starting position. (b) Continuous discrete paradigm. The helicopter did not reset to the starting position after flying through a ring. (c) Continuous random paradigm. The rings could be anywhere within the original ring space at any vertical orientation. (d) Examples of what the subject saw during each phase of a trial.