Eye movements in natural viewing conditions do not provide unequivocal evidence on the visual information metric being used by observers. Indeed, due to an imperfect coupling between overt and covert attention, it is not possible to unequivocally isolate which information the observer is processing based on fixation locations alone. In some circumstances, visual information can be efficiently processed without focal fixations, or does not straightforwardly translate to information uptake.
In gaze-contingent paradigms the stimulus display is continuously updated as a function of the observers’ current gaze position. As a result, the gaze-contingent technique is a powerful method to control for the visual information feeding the visual system and to isolate information use. In the past few years, we have developed a series of original gaze-contingent paradigms in order to address important questions in visual cognition.
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