This is the unspecified version of the paper.This version of the publication may differ from the final published version. average 72 and 139 ms respectively) to a numerical counter. The movement of the eyes was used to start the counter incrementing once every second, with the exception that the duration of the first number could be varied between 400 and 1600 ms. Subjects had to say whether the time they had seen the first digit was more or less than that for the subsequent digits (a constant 1 s). suggesting that the illusion of chronostasis is linked to the time taken to move the eyes. In fact, subjects appeared to extend the time that they thought they had seen the first target back in time to approximately 50 ms prior to the start of eye movement. Although subjects reported no awareness of the counter changing during their saccades, it is possible that they were able to use this digit shift as a cue to initiate time judgements. This would invalidate the matched times we calculated (measured from the moment the eyes actually reached the counter). However, a control experiment in which the counter was triggered either very early or very late during a large (55º) saccade showed no difference in the duration of chronostasis, despite modifying the period that the digit was actually on screen by 85 ms. Permanent repository link 3The tight coupling of the duration of chronostasis to the duration of the saccade suggests that the effect may be linked to the perceptual "gap" caused by saccadic suppression and retinal blur that occurs when we move the eyes 3,4 . However, it is possible that the illusion of chronostasis is not tightly coupled to movement of the eyes per se, but occurs because subjects also shift the locus of their visual attention at around the time their eyes move 5 . This attention shift may act as the reference point to which the target is predated. In order to test this, subjects were asked either to make the usual saccade to target or first to shift their attention to the target and then move their eyes. Figure 2a shows that the illusion of chronostasis persisted with a similar magnitude when subjects shifted their attention before moving their eyes. Control trials intermixed with the eye movement trials verified that subjects were successful in shifting the locus of their visual attention 6 . They fixated a central cross and had to saccade to a target appearing on the right or left of the screen. If they had been told to shift their attention to the correct side before the target appeared, their reaction time was faster than if they had been incorrectly cued (Fig 2b).Although chronostasis is linked to voluntary saccades, the coupling is not obligatory:there is at least one condition under which the illusion is not experienced. We designed a third experiment in which the positional stability of the target counter was systematically broken.Subjects made a saccade to target, but in some trials the computer displaced the target by up to 9 degrees during the time the eyes were moving. Under such condi...

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