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- Visual scenes typically contain more objects than be recognized or remembered in a single glance. But the visual angle covered by fovea is only approximately 2 degrees, about the size of eight letters on a typical page of text or the size of thumbnail held at arm’s length. If detailed information is needed from many different areas of the visual environment, it can only be obtained by redirecting the eye so that the relevant objects fall sequentially on the fovea. Pioneer study by Russian psychologist Yarbus [8] demonstrated that human scans a scene by the eye jumps which are known as saccades. Similar to his study, this research asked the observer to view the scene with that particular question in mind. First of all, if comparing the total number of fixations, saccades, and blinks in the trial, statistical analysis found that Q1a,Q2a, Q3a, and Q4a was almost all significantly different (P<0.05). It was similar to Q1b, Q2b, Q3b, and Q4b (see Table1~3). The situation was the same to the comparison among Q5, Q6, Q7, and Q8 (P<0.05). But there was not significantly different between Q1a and Q1b, Q2a and Q2b, Q3a and Q3b …and so on. However, if comparing the average duration of all fixations, average size of all saccades, average horizontal/vertical angular resolution in the trial, there were no significant differences. These results confirm Yarbus’s study and prove that the seeking information of a specific type has a significant affect on the eye-gaze pattern, especially the total number of fixations and saccades in this case.
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提问者：网友
2017-05-23
