| Inhibition of return is a phenomenon, which was found in the field of spatial selective attention. When Posner &Cohen used spatial cuing paradigm to study attention orienting, they found that the response to the target at the cued location was lower than that at the uncued location when cue-target SOA was longer than 300ms. The phenomenon was called 'inhibition of return" (IOR). After IOR was found, it became one of (he most important topic of cognitive psychology. Researchers examined its mechanism from different aspects and brought forward many theories, such as attention-inhibited hypothesis, response-inhibited hypothesis, attentional momentum and translation-inhibited theory. Recently, there is a view, which the mechanism of IOR is unlike under different response modality. Maybe, it is attention at the cued location that is suppressed, perhaps it is response at the cued location that will be inhibited. Few experiments supported this hypothesis. In this paper some experiments are designed in order to provide some supports for this view.This paper consists of two experiments. In experiment 1, when the response is oculomotor, the effect of fixation cue, target luminance and SOA on IOR is examined; in experiment 2, when the response is manual, the effect of fixation cue, target luminance and SOA on IOR is studied.The results of two experiments show that when the response is oculomotor, the main effects of cuing condition, fixation cue and target luminance are significant, the interaction between IOR and fixation cue is significant; when the response is manual, the main effect of cuing condition and target luminance aresignificant, the main effect of fixation cue is not significant, the interaction between IOR and target luminance is significant According to experimental dissociation, we concluded that attention and response at the cued location were operating in IOR, but under the different response modality, the mechanism of IOR is unlike.
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