FIGURE 1.

Stimuli presentation. Each trial started with the presentation of the fixation cross for 500 ms. Immediately after, the auditory cue was presented, that could be short (100 or 150 ms) or long (300 or 350 ms). The auditory cue could overlap with the target for 100 ms (overlap conditions) or not (no-overlap conditions). At 100 ms before the tone’s offset (overlap conditions) or at the same time as the tone’s offset (no-overlap conditions), the Arabic digit was presented for 300 ms. As soon as the Arabic digit appeared, participants had to answer, as quickly and accurately as possible, if the number was smaller or larger than 5, by saying the non-words “Ti” and “To” (response pattern counterbalanced between participants). After that, only the participants assigned to the Dual Task condition had to report if the tone was short or long, by saying the words “short” and “long,” at the appearance of the word “DURATION?”