Title: Mislocalization of Stationary and Flashed Bars after Saccadic Inward and Outward Adaptation 1 of Reactive Saccades 2 3

33 34 Recent studies have shown that saccadic inward adaptation, i.e. the shortening of saccade amplitude, and 35 saccadic outward adaptation, i.e. the lengthening of saccade amplitude, rely on partially different neu36 ronal mechanisms. There is increasing evidence that these differences are based on differences at the tar37 get registration or planning stages since outward but not inward adaptation transfers to hand-pointing and 38 perceptual localization of flashed targets. Furthermore, the transfer of reactive saccade adaptation to 39 long-duration overlap and scanning saccades is stronger after saccadic outward adaptation than after sac40 cadic inward adaptation, suggesting that modulated target registration stages during outward adaptation 41 are increasingly used in the execution of saccades when the saccade target is visually available for a 42 longer time. The difference in target presentation duration between reactive and scanning saccades is 43 also linked to a difference in perceptual localization of different targets. Flashed targets are mislocalized 44 after inward adaptation of reactive and scanning saccades but targets that are presented for a longer time 45 (stationary targets) are mislocalized stronger after scanning than after reactive saccades. This link be46 tween perceptual localization and adaptation specificity suggests that mislocalization of stationary bars 47 should be higher after outward than after inward adaptation of reactive saccades. In the present study we 48 test this prediction. We show that the relative amount of mislocalization of stationary versus flashed bars 49 is higher after outward than after inward adaptation of reactive saccades. Furthermore, during fixation 50 stationary and flashed bars were mislocalized after outward but not after inward adaptation. Thus, our 51 results give further evidence for different adaptation mechanisms between inward and outward adapta52 tion and harmonize some recent research. 53 54 55 56 57 58