Figure 6.

Relationship between task performance, normalized action timing and variability. Action timing and variability were normalized to remove the coherent influence of learning (see Methods: Relationship between action timing and task performance) and can therefore take negative values. (a) In both groups, there is a strong relationship between the normalized action timing and trial length (task performance). Generally, the more predictive actions are performed (negative action timing) the better the task performance. (b) Subjects in the group CG show a higher action variability for low task performances (trial length shorter than 5 seconds). The action variability is not significantly related to the task performance for subjects in the group GG. The shaded areas indicate the inter-subject variability (±1 SEM). For the purpose of illustration, the curves were smoothed over time using the weighted running average method.