Fig. 1.

Experimental task. Visual stimulation is shown exemplarily for one block of four trials (red fixation dots) with preceding and succeeding resting blocks (white fixation dots). Durations are shown below each screenshot (possible jittered duration are given in brackets). In the table at the top the motion directions with their corresponding audio cues (that were played to the subject at the start of a trial) are shown (number-motion direction association varied between subjects). At the top right one frame of the reference stimulus is shown representing the reference phase.