Figure 3.

Mean visual duration discrimination sensitivity (d′), SEM indicated) for each condition in Experiment 2. Asterisks above bars point to significant differences relative to the visual-only baseline, with the latter represented here by the orange dashed line with SEM shading. The significant enhancement or decrease of sensitivity, for the untripled congruent and incongruent conditions (respectively) replicates the findings of Experiment 1a. These effects were eliminated or reduced (respectively) for the corresponding two new tripled conditions, in which a sound still onset concurrently with each flash, but the sounds now were three times as long.