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Abstract The pupil response and fixation position are important variables in eye movement researches. However, they are susceptive to the disturbance of eye blinks. While most studies only focus on the data missing and fluctuation during blinks, but neglect the more extensive influence of blinks on pupil response and fixation position. Thus, present study aims to precisely examine the impacts of blink on pupil response and fixation position. We recorded the pupil size and fixation position using a video eye tracker, and indentifying the blinks based on these data in a simple prolonged fixation task. The temporal sequence was relined to the onset and end of the detected blinks. We observed a large fluctuation (approximately 12%) in the pupil response, which last approximately 4 seconds after the ending of eye blink. During this period, the pupil size was significantly smaller than the baseline from 300 to 1700 ms (P<FDR005). Meanwhile, the fixation errors induced by blinks amount to approximately 1° within the initial 200 ms after the ending of blinks, which was significantly greater than the baseline(P <FDR005). Moreover, the blinkinduced pupil variation could artificially bias the recorded eye position(with a maximum of 026°in the present study). Our results suggest that the spontaneous blinks affect the pupil size and fixation position to a much larger extent and longer duration than commonly assumed, which should be taken into consideration in the careful explanation of eye movement related experimental results.
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