Fig. 4

Schematic illustration of the task. Each trial started with a 100% informative visual cue telling the subject to either attend the auditory (“A”) or the visual modality (“V”). After an ISI of 2 s, a left- or right-oriented Gabor patch and a low-frequency (1131 Hz) or high-frequency (1987 Hz) pure tone were simultaneously presented. After another ISI of 0.5 s, a response screen depending on the cued modality appeared for 2 s. The intertrial interval was uniformly jittered between 1 and 2 s