Figure 1.

Experimental design. The duration of the square/diamond, the duration of the metacontrast go-annulus, and the stimulus onset asynchrony between the square/diamond and the metacontrast go-annulus were varied. To this end, the mask was unsuccessful in masking the preceding square/diamond on some occasions (weakly masked conditions) but rendered it invisible at others (strongly masked conditions; see Results). Thereby, two factors were manipulated [trial (go or no-go) and visibility (weakly masked or strongly masked)], which constitutes a 2 × 2 factorial design with the following four conditions: (1) a weakly masked no-go condition, (2) a weakly masked go condition, (3) a strongly masked no-go condition, and (4) a strongly masked go condition.