Figure 4.

Gaze history influences saccade selection in free-viewing. (a) Typical scanpath generated by random sampling from the conditional fixation density (computed as in Figure 3b) estimated for another example image. The simulation takes into account both the distribution of attentional priority in the image and the oculomotor factors influencing saccade selection. (b) Relative saccade metrics in scanpaths simulated on the basis of conditional fixation density. This distribution corresponds to a prediction of the gaze statistics expected under memoryless saccade planning. Note prevalence of return saccades (R), despite simulation procedure having no memory for preceding eye movements. (c) Discrepancy between actual and predicted probability distributions, indicating the influence of gaze history on saccade planning. Hot colors correspond to facilitated eye movements, cold colors to inhibition. Note that return saccades are strongly inhibited compared to the prediction based on memoryless saccadic planning.