Inhibition of return (IOR) refers to slowed responses to targets presented at the same location as a preceding stimulus. We explored whether the IOR effect would increase with the number of cues preceding the target (a 'cue'). Subjects performed a Posner cueing task with 1-5 cue presentations prior to the target, to which they made either a manual localization (Experiment 1) or target discrimination response (Experiment 2). The cues could be the same as (Experiment 1), or differ in shape from (Experiment 2), the target. The results showed that regardless of cue-target congruency the IOR effect increased dramatically with the number of preceding cues. This increase was driven mostly by a linear slowing of reaction times to targets presented on the same side as the cue(s), suggesting that a process such as sensory adaptation and/or habituation may be a contributing mechanism to the IOR effect.
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