Microsaccade and drift dynamics reflect mental fatigue
Microsaccade and drift dynamics reflect mental fatigue
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DOI：
10.1111/ejn.12248
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发表时间：
2013-08-01
影响因子：
3.4
通讯作者：
Martinez-Conde, Susana
中科院分区：
文献类型：
--
作者：
Di Stasi, Leandro L.;McCamy, Michael B.;Martinez-Conde, Susana
我们的眼睛总是在运动。即使在相对固定的时期，我们也会产生所谓的“固定眼球运动”，包括微扫视、漂移和震颤。精神疲劳可以调节眼跳动力学，但其对微眼跳和漂移的影响尚不清楚。在这里，我们要求人类受试者执行一个长期的和苛刻的视觉搜索任务（一个简化的空中交通管制任务），有两个难度水平，在自由观看和固定的条件下。扫视和微扫视速度随任务时间的增加而下降，而漂移速度则增加，这表明眼球不稳定性随精神疲劳而增加。任务难度并没有影响眼球运动，尽管影响反应时间，性能错误和主观复杂性评级。我们提出，眼动动力学的变化与时间上的任务是一致的大脑的睡眠中心的激活与精神疲劳。此外，扫视和微扫视参数的协变支持微扫视和扫视的共同发生器的假设。我们的结论是，固定和扫视动态的变化可以表明精神疲劳，由于时间的任务，无论任务的复杂性。这些发现表明，注视眼动动力学有可能信号的神经系统的激活状态。
\Our eyes are always in motion. Even during periods of relative fixation we produce so-called 'fixational eye movements', which include microsaccades, drift and tremor. Mental fatigue can modulate saccade dynamics, but its effects on microsaccades and drift are unknown. Here we asked human subjects to perform a prolonged and demanding visual search task (a simplified air traffic control task), with two difficulty levels, under both free-viewing and fixation conditions. Saccadic and microsaccadic velocity decreased with time-on-task whereas drift velocity increased, suggesting that ocular instability increases with mental fatigue. Task difficulty did not influence eye movements despite affecting reaction times, performance errors and subjective complexity ratings. We propose that variations in eye movement dynamics with time-on-task are consistent with the activation of the brain's sleep centers in correlation with mental fatigue. Covariation of saccadic and microsaccadic parameters moreover supports the hypothesis of a common generator for microsaccades and saccades. We conclude that changes in fixational and saccadic dynamics can indicate mental fatigue due to time-on-task, irrespective of task complexity. These findings suggest that fixational eye movement dynamics have the potential to signal the nervous system's activation state.