**Participants.** 20 participants will be recruited through word of mouth and campus mailing lists. Given the Covid-19-related situation, a large proportion of participants will most likely be member of Martin Rolfs' lab. Each participant will complete one session of approximately 1 hour. Participants will receive 8 Euros per session, plus 2 Euros for every 15 minutes of overtime. We will obtain written informed consent from all subjects prior to inclusion in the study.
**Apparatus & Stimuli** Same as Experiment 1, see [https://osf.io/94785/][1].
**Procedure.** The experiment was identical to Experiment 1 (Figure 1), with two exceptions. First, to extend stimulation beyond the offset of saccades, presentation durations will be increased. More specifically, presentation durations will amount to 33.3, 41.7, 50, and 58.3 ms, so that both intra- and post-saccadic presentations will occur (for exemplary timing data from a pilot run, see Figure 2). Second, as strictly intra-saccadic presentation are not a prerequisite for this experiment, the circular boundary around the saccade target will be increased to 4.5 dva, so that feedback about too short or misguided saccades will be given less frequently if saccades undershoot.
![Figure 1][3] *Figure 1.* Illustration of experimental paradigm of Experiment 1, taken from [Schweitzer (2020)][2]. Experiment 2 will be identical, except for presentation durations.
![Figure 2][4] *Figure 2.* Distribution of presentation offsets relative to saccade offset for various presentation durations. Vertical lines indicate saccade offset (at 0) and average saccade onset, respectively. Edit: The y-axis should be 'Frequency', not 'Density'.
**Design, Online saccade detection, and tachistoscopic display** Same as Experiment 1, see [https://osf.io/94785/][5], except for prolonged presentation durations (i.e., 33.3, 41.7, 50, and 58.3 ms) to achieve post-saccadic stimulation offsets.
**References**
Schweitzer, R. (2020). Perceptual and Motor Consequences of Intra-saccadic Perception. Doctoral thesis. doi: 10.18452/22148
[1]: https://osf.io/94785/
[2]: http://dx.doi.org/10.18452/22148
[3]: https://mfr.osf.io/export?url=https://osf.io/pgd59/?direct%26mode=render%26action=download%26public_file=False&initialWidth=774&childId=mfrIframe&parentTitle=OSF+%7C+ISSP_paradigm_figure.png&parentUrl=https://osf.io/pgd59/&format=2400x2400.jpeg
[4]: https://mfr.osf.io/export?url=https://osf.io/m82vj/?direct%26mode=render%26action=download%26public_file=False&initialWidth=774&childId=mfrIframe&parentTitle=OSF+%7C+pres_sacc_offset_distribution.png&parentUrl=https://osf.io/m82vj/&format=2400x2400.jpeg
[5]: https://osf.io/94785/
