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The response speed to a visual target is modulated by the position of previous events (cues) even if their position is not predictive of the target position. The modulation has been considered biphasic, with an early facilitatory and a later inhibitory component. We conducted three experiments that investigated the importance of the onset and oset features of the cue for the facilitatory and inhibitory eects and estimated their separate and joint eects. The two possible target locations, one in the right and one in the left visual ®eld, were indicated by two empty boxes, and the cue consisted of the onset and/or oset of an arrowhead located just under one of the two boxes. Dierent time intervals were used between cue and target. Subjects were instructed to ignore the cue and to respond to the target (a cross inside one of the two boxes). The data showed only consistent eects of inhibition (inhibition of return) with the long intervals, but the pattern was dierent depending on the cue type. The amount of inhibition was much greater when the onset of the cue was followed by its oset. Apparently, inhibition of return depended on the dynamic changes of the cue.

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