The Mechanisms of Movement Control and Time Estimation in Cervical Dystonia Patients
Figure 1
The task and experimental conditions. (a) The main interception task. The green ball moves from the left side of the screen to the interception zone in the upper right corner of the screen (as for the position, corresponding to the pink cross square in Figure 1(c)). The blue “gun” in the lower right corner fires a “projectile” travelling at a constant speed to intercept the green ball. (b) Successful hit. If the ball is intercepted by the projectile, both objects explode. In case of miss, there is no animation. (c) Control condition 1. There is no projectile in this condition. The subject is supposed to press the button at the very moment the green ball reaches the interception zone marked by the cross inside the pink square. If the subject is successful, the ball explodes. (d) Control condition 2: the green ball once again moves from the left side of the screen to the interception area. However, there is no gun/projectile or pink interception square. The subject is supposed to press the button as soon as the ball changes its color from green to red.
