namics of the mean horizontal distance compared to all other conditions. This could be due to a stronger directional bias in left-focus images than in right-focus images in our experimental material. It is also possible that there is a general tendency to first look at the left image side and then scan to the right—a tendency that has been found earlier in scene viewing (Dickinson & Intraub, 2009; Ossand´ on et al., 2014), pattern exploration (Abed, 1991) and face viewing (Guo, Meints, Hall, Hall, & Mills, 2009)—which is con- gruent to the reading direction of our participants. A dynamical model of eye guidance might perform better with an additional Bayesian-type prior probability implementing a leftward bias and a center bias for initial saccades. Thus, our results emphasize the need for more advanced dynamical models of scanpath generation. 

## Conclusion 

The experimental manipulation of starting position exerts a strong and long lasting influ- ence on scanpaths during scene exploration. Using computational models, we demonstrate that a model with inhibitory tagging can explain the mean overshoot of gaze position to the image side opposite to the starting position whilst simple statistical models as well as a saccadic momentum model can not reproduce this overshoot. These results lend support to inhibitory tagging as a dynamical principle of saccade planning during scene viewing. 

## Acknowledgements 

This work was supported by Deutsche Forschungsgemeinschaft (grants EN 471/13–1 and WI 2103/4–1 to R. E. and F. A. W., resp.). 

