Eye tracking involves the recording of eye movements, either by the projection of infra-red or near infra-red light on the pupil, or by electrodes placed around the eyes. Once calibrated with a stimulus display, eye tracking can be used to measure how an individual scans a visual scene. Measures such as gaze path, fixation duration, frequency of fixation and speed of eye movements can reveal much more than solely using self-report or behavioural measures such as accuracy and reaction times.
My university has recently purchased a number of eye-tracking glasses (SensoMotoric Instruments), which allow for the collection of eye-tracking data outside the laboratory. The glasses record high definition video and provide an online superimposed fixation spot which is streamed to a smartphone or laptop. The addition of such technology revolutionises eye tracking in real-world scenarios and is able to capture behaviours uninfluenced by the laboratory.
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