B.3.6.2.4. Procedure
Each trial began with the cue (colour word or neutral word), presented during 800 ms, followed by a black screen during 1200 ms. Then, the display appeared for 200 ms, followed by a black screen until the response of the subject. The experiment was divided in two counterbalanced blocks of 180 trials (30 trials in each condition). In one block, salience was manipulated by size; in the other block, salience was manipulated by colour. Except salience, the two blocks were identical. In each block, half of the trial were validly cued (relevant). In the other half, no information was given about the target (neutral). In one third of the trials, the target was made salient. In one other third, a distractor was made salient. In the last third of trials, no item was salient. These two factors (salience and relevance) were manipulated orthogonally. With this protocol, relevance and salience could concern the same perceptual dimension or a different dimension.
