Angular Offset Distributions During Fixation Are, More Often Than Not, Multimodal.

IF 1.3 4区 心理学 Q3 OPHTHALMOLOGY
Lee Friedman, Dillon Lohr, Timothy Hanson, Oleg V Komogortsev
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引用次数: 0

Abstract

Typically, the position error of an eye-tracking device is measured as the distance of the eye-position from the target position in two-dimensional space (angular offset). Accuracy is the mean angular offset. The mean is a highly interpretable measure of central tendency if the underlying error distribution is unimodal and normal. However, in the context of an underlying multimodal distribution, the mean is less interpretable. We will present evidence that the majority of such distributions are multimodal. Only 14.7% of fixation angular offset distributions were unimodal, and of these, only 11.5% were normally distributed. (Of the entire dataset, 1.7% were unimodal and normal.) This multimodality is true even if there is only a single, continuous tracking fixation segment per trial. We present several approaches to measure accuracy in the face of multimodality. We also address the role of fixation drift in partially explaining multimodality.

Abstract Image

Abstract Image

Abstract Image

固定过程中的角度偏移分布往往是多模态的。
通常情况下,眼动追踪设备的位置误差是根据眼球位置与目标位置在二维空间中的距离(角度偏移)来测量的。精度就是平均角度偏移。如果底层误差分布是单峰正态分布,那么平均值就是一种高度可解释的中心倾向测量值。然而,在底层多模态分布的情况下,平均值的可解释性较差。我们将提出证据,证明大多数此类分布都是多模态分布。只有 14.7% 的固定角偏移分布是单模态分布,其中只有 11.5% 是正态分布。(在整个数据集中,有 1.7% 是单模态和正态分布。)即使每次试验只有一个连续的跟踪固定片段,这种多模态分布也是真实的。我们介绍了几种在多模态情况下测量准确度的方法。我们还探讨了固定漂移在部分解释多模态性中的作用。
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来源期刊
CiteScore
2.90
自引率
33.30%
发文量
10
审稿时长
10 weeks
期刊介绍: The Journal of Eye Movement Research is an open-access, peer-reviewed scientific periodical devoted to all aspects of oculomotor functioning including methodology of eye recording, neurophysiological and cognitive models, attention, reading, as well as applications in neurology, ergonomy, media research and other areas,
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