Systematic influence of gaze position on pupil size measurement: analysis and correction
Systematic influence of gaze position on pupil size measurement: analysis and correction
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DOI：
10.3758/s13428-011-0109-5
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发表时间：
2011-12-01
影响因子：
5.4
通讯作者：
Hutzler, Florian
中科院分区：
文献类型：
--
作者：
Gagl, Benjamin;Hawelka, Stefan;Hutzler, Florian
认知努力反映在瞳孔扩张上，但瞳孔大小的评估可能容易受到注视位置变化的影响。本研究以句子阅读作为范例，在注视位置不可避免变化的任务中评估瞳孔大小。首先利用固定瞳孔大小的人工眼模型研究了注视位置对瞳孔大小的影响。尽管它的瞳孔大小是固定的，但对人工眼模型的系统测量显示，瞳孔大小随注视位置的变化而变化。我们评估了两个功能，并表明它们可以准确地捕获和纠正在句子阅读和轻松的z弦扫描任务中记录的瞳孔大小的注视依赖测量误差。讨论了以往研究的意义，并对未来的研究提出了建议。
Cognitive effort is reflected in pupil dilation, but the assessment of pupil size is potentially susceptible to changes in gaze position. This study exemplarily used sentence reading as a stand-in for paradigms that assess pupil size in tasks during which changes in gaze position are unavoidable. The influence of gaze position on pupil size was first investigated by an artificial eye model with a fixed pupil size. Despite its fixed pupil size, the systematic measurements of the artificial eye model revealed substantial gaze-position-dependent changes in the measured pupil size. We evaluated two functions and showed that they can accurately capture and correct the gaze-dependent measurement error of pupil size recorded during a sentence-reading and an effortless z-string-scanning task. Implications for previous studies are discussed, and recommendations for future studies are provided.