Rothkegel et al. 30 Figure 8 . Distance to image center over time for the empirical data and the 5 saccade generation models. We did not split the data into groups of pre-trial fixation time for visibility purposes. The SceneWalk StartMap model (green curve) is the only one that progresses similarly to the empirical data (black curve). The Gauss model (cyan curve) and the center bias sampling (blue curve) do not converge with the empirical data in the end. Inlays represent the summed deviation of model curves to the empirical data. was too close to the center. The bad performance of the Gaussian model demonstrated that a second mechanism is needed to move fixations away from the current fixation location. In the SceneWalk model this is implemented by inhibitory tagging via the fixation map (c.f., Rothkegel et al., 2016). The initial decline of DTC of the Center Bias model was weaker and slower than observed in our experiments (Exp. 1–3). This indicated that the CFB on the second fixation was stronger than estimated from Fixation 2–4. The inlays in Figure 8 show the overall deviation of model curves from the empirical data. The SceneWalk StartMap outperformed other models and deviated the least in all four Experiment 1 Experiment 2 Experiment 3 Experiment 4 0 2000 4000 0 2000 4000 0 2000 4000 0 2000 4000 0 2 4 6 8 10 12 time [ms] distance to center [°] Model Density Model Gauss Model Center Bias SceneW alk SceneW alkStar tMap Data