Fig. 4.

Stimulus paradigm. The rectangles represent tones. The width of the rectangles denotes stimulus intensity (bold: 85 dB SPL, thin: 70 dB SPL). The axes represent time (abscissa) and frequency (ordinate). The auditory panels of the schematic show a rising three-tone frequency pattern within the low set of tones, alternating with a random presentation of high tones (see text, Section 4.3 for further description). The visual panel shows the sequential presentation of square stimuli, synchronized with the rising frequency pattern (A). The standard (rising sequence) and deviant (falling sequence) of the low sequence are pointed out in the boxes. The presentation of the circle stimuli is synchronized with the 85 dB tones, which cross frequency ranges (B). The dashed lines indicate the expected organization induced by the visual stimuli (i.e., frequency pattern when segregated and intensity pattern when integrated).