Rothkegel et al. 28 SceneWalk SceneWalk StartMap Fixations 1-2 Fixations 2-3 Fixations 3-4 Figure 7 . Fixations 1–4 of a randomly chosen trial with a pre-trial fixation time of 0 ms. In this example the initial fixation duration is very short and thus the initial central activation map of the SceneWalk StartMap has a strong influence on the first saccade target. 4 . 2 $^{◦}$. This resulted in small initial differences in activations between center and periphery for simulations of Experiment 4 and was similar to the constant activations in the original model. The reason for this behaviour arises from the architecture of the model. Since activations in the attention map rise near fixation, central activations are prioritized initially when participants start to explore a scene near the image center. Figure 7 shows the simulated fixations 1–4 of a randomly chosen trial for the two different versions of the SceneWalk model. The initial fixation duration in this trial was very short ( t = 184 ms ) and thus the initial attention map of the SceneWalk StartMap model is biased stongly towards the center whereas the original SceneWalk model does not show an increased central activation during initial fixations.