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Supplementary Figure 1. Cued movement task. a, Behavioral task. As in the main experiment, subjects identified the direction of motion of dynamic random dot stimuli. Instead of responding when ready, subjects
 

Summary: Supplementary Figure 1. Cued movement task. a, Behavioral task. As in the main experiment, subjects
identified the direction of motion of dynamic random dot stimuli. Instead of responding when ready, subjects
were trained to time the initiation of their movement so that it coincided with the 4th
of a series of 5 beeps and
to bring the cursor to the choice target on the 5th
beep. The stimulus motion began at a random time 200-2000
ms (mean 440 ms) before the 4th
beep and ended at the beep or at movement initiation, whichever occurred
first (see Methods for additional details). b, Distribution of initial hand velocity in the cued condition for the 3
subjects. Histograms of lateral (horizontal) hand velocity when it had moved 2 cm outward from the home
position. Hartigan's test of unimodality37
shows that the distributions are bimodal (p<0.001 for all subjects).
Note that the classification of initial choices was not based on these measurements but instead on analysis of
the hand trajectories (see Methods). Subjects clearly indicated a choice at initiation by moving in the direction
of one of the targets. On many trials, however, subjects reversed this initial choice during the movement (see
Supplementary Figure 2).
SUPPLEMENTARY INFORMATION
doi: 10.1038/nature08275
www.nature.com/nature 1
Supplementary Figure 2. Accuracy improves through "changes of mind" in the cued movement task. a, Data

  

Source: Andrzejak, Ralph Gregor - Departament de Tecnologia, Universitat Pompeu Fabra

 

Collections: Computer Technologies and Information Sciences