Deleterious effects of roving on learned tasks

- Roving deteriorates experts' performance.
- Roving has no impact on novice's performance.
- Only stimuli that hinder perceptual learning in roving situations deteriorate performance.

In typical perceptual learning experiments, one stimulus type (e.g., a bisection stimulus offset either to the left or right) is presented per trial. In roving, two different stimulus types (e.g., a 30′ and a 20′ wide bisection stimulus) are randomly interleaved from trial to trial. Roving can impair both perceptual learning and task sensitivity. Here, we investigate the relationship between the two. Using a bisection task, we found no effect of roving before training. We next trained subjects and they improved. A roving condition applied after training impaired sensitivity.