Fig. 1.

Schematic illustration of the procedure for the present study. The cues consisted of four small dots that formed an imaginary rectangle. The size of the cues could be large (a) or small (b). The search array consisted of two horizontal lines, one vertical line and one diagonal line. The large valid cues covered the whole search array (a), whereas the small valid cues covered only the quadrant containing the diagonal line (b). On 50% of trials, the search array appeared at the same side as the cue. Cues and search arrays could appear either to the left or to the right of fixation with equal probability. Invalid trials are not shown here; however, they were identical to valid trials except that the cue and the search array appeared on opposite sides of the screen from one another.