What determines where we look? Eye position data from subjects viewing a range of images of natural scenes are used to investigate the positions that are fixated by the eyes over the course of several seconds of viewing. This behavioural data suggests that both exogenous and endogenous factors are involved in the targeting of saccades. Fixation positions are then modeled with respect to low-level image features by the construction of saliency maps for 4 different regularities, each at 3 spatial scales. We find that contrast and edge-content saliency maps, particularly at the fine spatial scales, are able to account for some of the behavioural data, but chromaticity and luminance do not appear to be involved in determining where we look. Over the course of viewing, the behavioural data suggests a change in the relative contributions of exogeny and endogeny in eye movement control.
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