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Supplementary Information

Description of Paradigm and visual Stimulation in Heinzle et al. (in preparation)

Visuo-motor functional network topology predicts upcoming tasks”

 

The flexible visuo-motor task required subjects to respond to a visual stimulus (go-signal) presented in their left or right visual hemifield with either the ipsilateral or the contralateral hand. The stimulus-response mapping varied between trials: In pro-trials (called ‘II), the response had to be given with the hand on the side of the visual go-signal, in anti-trials (called ‘X-trials’) with the hand opposite to the go-signal. The task condition was indicated by a cue at the beginning of each trial (‘II’ or ‘X’, 3s). After a pause of 2s, subjects were presented two clock-like shapes, in the left and right visual field, with eight clock hands each (Fig. 1B) rotating at different velocities. Specifically, all eight hands of each clock rotated in the same direction with their rotational velocities normally distributed around a mean of m=50°/s with standard deviation s=30°/s. Negative speeds were inverted so that all clock hands turned into the same direction. At the go-signal, all speeds were set to m=50°/s.

 

Short explanation of trials in the Stimulus Video:

The stimulus video (Heinzleetal_Stimulus.avi) shows three consecutive, illustrative trials of the paradigm.

Trial 1 is a X-trial, with a delay period of 14 seconds. The go-signal (synchronization of clock hands) is shown on the left and the subject responds correctly with a right finger press. The black bar shown after the button press indicates reaction time and was used to motivate subjects to respond as quickly as possible.

Trial 2 is a X-trial, with a delay period of 10 seconds. The go-signal is shown on the right and the subject makes an error by responding with a finger press on the right. This error is indicated to the subject: Falsche Seite! (Wrong side!).

Trial 3 is a II-trial with a delay period of 4 seconds, i.e. a catch trial. The go-signal is shown on the left and the subject responds correctly with a left finger press.

Heinzleetal_Stimulus.avi





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