Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.
Developmental Psychology, Utrecht University, Utrecht, The Netherlands.
Behav Res Methods. 2019 Dec;51(6):2712-2721. doi: 10.3758/s13428-018-1135-3.
Most modern video eye trackers deliver binocular data. Many researchers take the average of the left and right eye signals (the version signal) to decrease the variable error (precision) up to a factor of [Formula: see text]. What happens to the systematic error (accuracy) if the left and right eye signals are averaged? To determine the systematic error, we conducted a calibration validation in two experiments (n= 79 and n = 64). The systematic error was computed for the left eye, right eye, and version signals separately. In respectively 29.5 and 25.8% of the participants, the systematic error of a single eye signal was lower than that of the version signal at the cost of a higher variable error. If a small variable error is desirable, and the difference between the left and the right eye is not the topic of study, one should average position data from the left and the right eye (in other words, use the version signal). If a small systematic error is desirable, one should use the signal (from left eye, right eye or version) that delivers the best accuracy. In the latter case, this may cause worse precision than that of the version signal.
大多数现代视频眼动追踪器提供双眼数据。许多研究人员会平均左眼和右眼信号（综合信号），将可变误差（精度）降低至[公式：见正文]。如果平均左眼和右眼信号，系统误差（准确性）会发生什么变化？为了确定系统误差，我们在两项实验（n=79 和 n=64）中进行了校准验证。我们分别为左眼、右眼和综合信号计算了系统误差。在分别有 29.5%和 25.8%的参与者中，单个眼信号的系统误差低于综合信号，代价是更高的可变误差。如果需要较小的可变误差，并且左右眼之间的差异不是研究的主题，那么应该平均左眼和右眼的位置数据（换句话说，使用综合信号）。如果需要较小的系统误差，则应该使用（左眼、右眼或综合信号）中准确性最佳的信号。在后一种情况下，这可能会导致比综合信号更差的精度。
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