Fig. 1.

Example of stimuli in the overlap condition (a), and the gap condition (b). The central stimulus was presented during a variable interval ranging between 800–1700 ms. In the gap condition (b), the central stimulus was extinguished before the onset of the peripheral stimulus, creating a temporal gap ranging between 120–200 ms. Auditory alerting cues were presented at variable time intervals ranging between 500 and 0 ms before the onset of the peripheral stimulus on 50% of the overlap trials