Binocular quantification and characterization of microsaccades
Binocular quantification and characterization of microsaccades
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DOI：
10.1007/s00417-002-0519-2
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发表时间：
2002-09-01
影响因子：
2.7
通讯作者：
Sjolie, AK
中科院分区：
文献类型：
--
作者：
Moller, F;Laursen, ML;Sjolie, AK
背景：微眼跳在视觉过程中的意义已经被讨论了50多年。然而，只有几项研究用双筒望远镜测量了微眼跳，需要对这些微小运动进行详细的量化和表征，以便进一步了解它们的性质。方法：采用红外记录技术，对10名正常受试者在40-S注视任务中的微扫视幅度、速度、加速度和方向进行定量。结果：所有受试者的所有微扫视都是同时和单独进行的，右眼和左眼的幅度几乎相同(右眼和左眼平均值之间的范围为0.003-0.042度)。受试者的平均微扫视幅度在0.223-1.079度范围内。同时进行的右眼和左眼微扫视中，84.8%的眼球运动方向差小于22.5°，表明大多数眼球运动是共轭的。三种不同的注视模式被识别和表征：(1)容易识别的漂移和中等大小的微眼跳之间的典型相互作用(平均幅度范围0.328-0.413°)；(2)长的眼跳间期(4-5个S)，几乎没有漂移，然后是3到4个大的微眼球(平均幅度范围0.755-1.079°)；以及(3)被低幅度微眼跳打断的低幅度漂移运动(平均幅度范围0.231-0.265°)。结论：在右眼和左眼，微眼跳是不自主的，主要是共轭的，同时进行，并且幅度几乎相同，这表明在皮质下水平的微眼跳是一种中枢控制机制。
Background: The significance of microsaccades in the visual process has been discussed for more than 50 years. However, only a few studies have measured microsaccades binocularly, and detailed quantification and characterization of these small movements are needed in order to further understand their nature. Method: The amplitude, velocity, acceleration and direction of microsaccades were quantified binocularly in 10 normal test persons during a 40-s fixation task, using an infrared recording technique. Results: All microsaccades for all test persons were performed simultaneously and individually with an almost identical amplitude in the right and left eye (a range of 0.003-0.042 deg between right and left eye mean values). The mean microsaccadic amplitude for the test persons was within a range of 0.223-1.079 deg. The directional difference between simultaneously-performed right and left eye microsaccades was less than 22.5 deg for 84.8% of the saccades, indicating that the majority of microsaccades are conjugated. Three different fixation patterns were identified and characterized: (1) a classic interplay between easily identified drifts and medium-sized microsaccades (mean amplitude range 0.328-0.413 deg); (2) long intersaccadic intervals (4-5 s) with almost absent drifts, followed by three or four large microsaccades (mean amplitude range 0.755-1.079 deg); and (3) low-amplitude drift movements interrupted by low-amplitude microsaccades (mean amplitude range 0.231-0.265 deg). Conclusion: Microsaccades are involuntary, predominantly conjugated, simultaneously performed, and of almost identical amplitude in the right and left eye, suggesting a central control mechanism for microsaccades at subcortical level.