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Effects of Perceptual Load and Distractors on Inhibition of Return

To explore the influence mechanism of perceptual load and distractors on time course of inhibition of return, flanker interference and perceptual load levels were combined with the IOR paradigm using discrimination task. The participants’s task was searching for the target and ignoring the distractors. The results showed that under high perceptual load, there was no IOR effect in the experiment, but the results at low perceptual load were inconsistent. There was significant IOR in short SOA (400ms) with low perceptual load when the distractors were consistent with the targets, but disappeared in long SOA with significant facilitation. According to the three-factor theory, the cue would cause the attention orientation of the cuing position, regardless of the distractors stimuli, “spatial selection benefit” and the facilitation appeared at short SOAs, while, it appeared “detection cost” and the IOR effect at longer SOAs.