The gaze-contingency paradigm
is a technique for studying eye movement
, a field of study in psychology that has revealed some of the details of cognitive function. Over the past century, the way the eyes move in human activities as diverse as playing sport, viewing works of art, piloting aircraft, exploring visual scenes, recognizing face or facial expressions, and reading language and music, has revealed some of the ocular and psychological mechanisms involved in the visual system.
The technical principle of the paradigm involves a computer interfaced with both an eye-movement tracking system and a display of the visual stimulus
. A fast computer, eye-tracker and display allow reliable results. In gaze-contingent paradigms the stimulus display is continuously updated as a function of the observers' current gaze position. Therefore, the gaze-contingent technique is a powerful method to control for the visual information feeding the visual system
and to isolate information use.
The gaze-contingent technique is the basis of various experimental paradigms, each of them allowing to investigate specific cognitive processes.In the moving window paradigm (e.g., Reder, 1973; McConkie & Rayner, 1975) only the part of the visual field
around the gaze location (foveal information
) is displayed normally, the surrounding part of the visual field (extrafoveal
and peripheral information
) being altered (removed for visual scenes or replaced by chains of X
in reading).The moving mask... Read More