An example of the timing of training trials for each set of trajectories.
Successive segments of the full trajectory set were chained to the end of previous segments; thus, this style of training is referred to as forward-chaining. Training proceeded from one segment to the next once an observer could track at least 80% of targets averaged over the previous 15 trials (or 5 trials during the first block), or once a segment was repeated 25 times. Dashed lines represent the block window; the portion of the original trajectory set from which trials in the training block were sampled. Solid lines represent examples of trials from the training blocks.