weakest DTC effect for pre-trial fixation times of 125 ms (inset in Fig. 4a). Pre-trial fixation times equal to or smaller than 50 ms generated fixation positions closest to the image center. Differences in DTC could be explained by the influence of the first saccade latency on the selection of the second fixation location (Fig. 4b). Thus, saccade latencies are the most important factor modulating the CFB. A post-hoc analysis revealed that saccade latencies were only affected in conditions with pre-trial fixation times larger than 50 ms. We conclude that a minimum pre-trial fixation time of around 75 ms is needed to prolong saccade latencies in order to reduce the CFB in scene viewing. 

## Experiment 4 

In Experiment 4, participants started exploration at the center of the screen. This starting position was chosen to quantify the influence of pre-trial fixation times in a standard scene viewing paradigm. 

## Methods 

Participants . In this experiment we recorded eye movements from 10 participants (3 male; 18–36 years old) 

Procedure . Experiment 4 followed the same procedure as the preceding experiments but participants started observation in the center of the screen. We tested pre-trial fixation times of 0, 125 and 250 ms since we observed only subtle changes of results for longer pre-trial fixation times in Experiment 1 and 2. As in Experiment 3, we used a within subject design for the three different pre-trial fixation times such that participants viewed blocks of 40 images for each pre-trial fixation time. 

