Figure 2. Illustration of one of the audio-visual stimuli.

The upper panel (a) shows the visual part of the stimulus while the middle one (b) the musical notation of a congruent auditory part of the stimulus and the lower one (c) the musical notation of an incongruent auditory part. The incongruency violated the presented visual pattern in terms of contour and thus for this tone it did not match the corresponding bar in the visual stimulus. This position of the incongruent bar-tone pair was never the first or the last one and was counterbalanced across and within the positions two, three and four of the patterns. The auditory part of the stimulus was presented 1 sec after the visual.