These test perception of stimuli in relation to time. They generally present pairs of stimuli with time dealys between them. Participants will report which stimuli was perceived first. Researchers are able to change the attentional bias to give advantage to one of the two stimuli. When attentional bias is affected, the perception of a stimuli's arrival time (the one with attention) can be affected to percieve that stimuli as occuring earlier than it actually did in relation to the paired stimuli.