Dummy eye measurements of microsaccades F Hermens |
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University of Aberdeen, United Kingdom
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| Microsaccades are small movements of the eyes made during visual fixation. Many of the investigations of these microsaccades have used a video-based eye tracker for their detection. We here investigate how reliable this method is by comparing the detection of microsaccades for one of these systems (Eyelink II) when recording from human eyes and a pair of dummy eyes. Dummy eyes were either fixed on a stationary dummy head or the dummy eyes were attached to a pair of glasses worn by a human participant. False detections were infrequent for stationary dummy eyes, indicating that the intrinsic noise of the video-based eye tracker did not result in signals resembling those from microsaccades. The number of false detections increased when the dummy eyes were mounted onto a human head, indicating that small movements of the head resulted in signals that could be interpreted as microsaccades. However, differences between detected microsaccades from actual eyes and dummy eyes were found, such as the absence of a clear correlation between the directions of the microsaccades in the two dummy eyes, which can be used to improve the method for detecting microsaccades. |
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