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The pupil-size artefact (PSA) across time, viewing direction, and different eye trackers
Behavior Research Methods ( IF 5.953 ) Pub Date : 2021-03-11 , DOI: 10.3758/s13428-020-01512-2
Ignace T C Hooge 1 , Diederick C Niehorster 2 , Roy S Hessels 1 , Dixon Cleveland 3 , Marcus Nyström 4
Affiliation  

The pupil size artefact (PSA) is the gaze deviation reported by an eye tracker during pupil size changes if the eye does not rotate. In the present study, we ask three questions: 1) how stable is the PSA over time, 2) does the PSA depend on properties of the eye tracker set up, and 3) does the PSA depend on the participants’ viewing direction? We found that the PSA is very stable over time for periods as long as 1 year, but may differ between participants. When comparing the magnitude of the PSA between eye trackers, we found the magnitude of the obtained PSA to be related to the direction of the eye-tracker-camera axis, suggesting that the angle between the participants’ viewing direction and the camera axis affects the PSA. We then investigated the PSA as a function of the participants’ viewing direction. The PSA was non-zero for viewing direction 0 and depended on the viewing direction. These findings corroborate the suggestion by Choe et al. (Vision Research 118(6755):48–59, 2016), that the PSA can be described by an idiosyncratic and a viewing direction-dependent component. Based on a simulation, we cannot claim that the viewing direction-dependent component of the PSA is caused by the optics of the cornea.



中文翻译:

跨时间、观察方向和不同眼动仪的瞳孔大小伪影 (PSA)

瞳孔尺寸伪影 (PSA) 是在眼睛不旋转的情况下,眼动仪在瞳孔尺寸变化期间报告的凝视偏差。在本研究中,我们提出三个问题:1) PSA 随着时间的推移有多稳定,2) PSA 是否取决于眼动仪设置的属性,以及 3) PSA 是否取决于参与者的观看方向?我们发现 PSA 在长达 1 年的时间内非常稳定,但参与者之间可能会有所不同。在比较眼动仪之间 PSA 的大小时,我们发现获得的 PSA 的大小与眼动仪-相机轴的方向有关,这表明参与者的观看方向和相机轴之间的角度会影响PSA。然后,我们研究了 PSA 作为参与者观看方向的函数。并且取决于观察方向。这些发现证实了 Choe 等人的建议。(Vision Research 118 (6755):48–59, 2016),PSA 可以由一个特殊的和与观察方向相关的组件来描述。基于模拟,我们不能声称 PSA 的观察方向相关分量是由角膜的光学引起的。

更新日期:2021-03-11
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