FIG. 1.

The four attention conditions. Each panel shows a schematic time course for each of the five loudspeakers. The “T” indicates that the target would occur in a particular loudspeaker (number 2 in this example) and at a point in time corresponding to one of five random-length time segments. The shaded region indicates in which loudspeakers and time segments the LEDs would be active. Note that in the when and where and when conditions, the LEDs came on synchronously with the onset of the auditory target.