Figure 1.

Illustration of stimulus-driven attention. Schematic data illustrating the main features of stimulus-driven attention in humans. Reaction times without a stimulus event are represented by the dashed horizontal line. Reaction times with stimulus events on the same side as a target (congruent, blue) and the opposite side as the target (incongruent, orange) are plotted for a range of delays between the stimulus event and target onset (stimulus-onset asynchrony [SOA]). At short SOAs, the subjects were faster to respond to congruent targets compared with incongruent targets. At longer SOAs, the subjects were faster to respond to incongruent targets compared with congruent targets; this phenomenon is known as inhibition of return.