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The contribution of stereopsis in Emmert's law.
Experimental Brain Research ( IF 2 ) Pub Date : 2020-03-25 , DOI: 10.1007/s00221-020-05747-5
Amy Siobhan Millard 1 , Irene Sperandio 2 , Philippe A Chouinard 1
Affiliation  

Size constancy is the ability to perceive objects as remaining constant in size regardless of their distance from the observer. Emmert's law demonstrates that viewing distance determines the perceived size of afterimages according to the amount of depth cues that are available. Using an afterimage paradigm, we examined to what extent removing stereopsis and other depth cues affects size-distance scaling. Thirty participants 'projected' afterimages onto a surface presented at different distances under binocular, monocular, and eyes-closed conditions. The perceived size of the afterimages closely followed the size-distance scaling predictions made by Emmert's law under binocular testing conditions, when all depth cues were available. In contrast, monocular testing decreased adherence to Emmert's law, while the eyes-closed condition resulted in a greater breakdown of size-distance scaling. Because we used an afterimage paradigm, this study provides the first demonstration of how perceived size is modulated by the availability of depth cues under conditions with a constant retinal image stimulus.

中文翻译:

立体视在埃默特定律中的贡献。

大小恒定性是指感知对象大小不变的能力,而不管它们与观察者的距离如何。埃默特定律证明,观看距离根据可用深度提示的数量确定残像的感知大小。使用余像范例,我们研究了去除立体视和其他深度提示在多大程度上影响尺寸距离缩放。在双目,单眼和闭眼条件下,有三十名参与者将余像“投影”到以不同距离呈现的表面上。当所有深度提示均可用时,余像的感知大小与双眼测试条件下埃默特定律所做的大小距离缩放比例预测非常接近。相比之下,单眼测试会降低对埃默特定律的依从性,闭眼导致更大的尺寸距离缩放比例崩溃。因为我们使用了残像范例,所以本研究首次证明了在恒定的视网膜像刺激条件下,深度提示的可用性如何调节感知的大小。
更新日期:2020-03-25
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