Eye tracking cognitive load using pupil diameter and microsaccades with fixed gaze.
Eye tracking cognitive load using pupil diameter and microsaccades with fixed gaze.
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DOI：
10.1371/journal.pone.0203629
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Krejtz I
中科院分区：
文献类型：
--
作者：
Krejtz K;Duchowski AT;Niedzielska A;Biele C;Krejtz I
眼动仪捕获瞳孔直径和微扫视，并比较它们作为认知负荷指标（受任务难度困扰）的适用性。具体来说，针对任务难度测试了两个指标：（1）瞳孔直径相对于试验间或试验内基线的变化，以及（2）微眼跳的速率和幅度。参与者在确定中心目标的同时完成简单和困难的心算任务。如果可以假定隐含的因果关系，则试验间瞳孔直径和微扫视幅度的变化似乎可以充分区分任务难度，从而充分区分认知负荷。本文的贡献证实了之前有关微扫视幅度的工作，并通过直接比较微扫视指标与瞳孔测量测量来扩展这项工作。据我们所知，这是第一项比较任务诱发的瞳孔和微扫视认知负荷测量的可靠性和敏感性的研究。
Pupil diameter and microsaccades are captured by an eye tracker and compared for their suitability as indicators of cognitive load (as beset by task difficulty). Specifically, two metrics are tested in response to task difficulty: (1) the change in pupil diameter with respect to inter- or intra-trial baseline, and (2) the rate and magnitude of microsaccades. Participants performed easy and difficult mental arithmetic tasks while fixating a central target. Inter-trial change in pupil diameter and microsaccade magnitude appear to adequately discriminate task difficulty, and hence cognitive load, if the implied causality can be assumed. This paper’s contribution corroborates previous work concerning microsaccade magnitude and extends this work by directly comparing microsaccade metrics to pupillometric measures. To our knowledge this is the first study to compare the reliability and sensitivity of task-evoked pupillary and microsaccadic measures of cognitive load.
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