People favour imperfect catching by assuming a stable world.

PloS One
Joan López-Moliner, Matthias S Keil

Abstract

The visual angle that is projected by an object (e.g. a ball) on the retina depends on the object's size and distance. Without further information, however, the visual angle is ambiguous with respect to size and distance, because equal visual angles can be obtained from a big ball at a longer distance and a smaller one at a correspondingly shorter distance. Failure to recover the true 3D structure of the object (e.g. a ball's physical size) causing the ambiguous retinal image can lead to a timing error when catching the ball. Two opposing views are currently prevailing on how people resolve this ambiguity when estimating time to contact. One explanation challenges any inference about what causes the retinal image (i.e. the necessity to recover this 3D structure), and instead favors a direct analysis of optic flow. In contrast, the second view suggests that action timing could be rather based on obtaining an estimate of the 3D structure of the scene. With the latter, systematic errors will be predicted if our inference of the 3D structure fails to reveal the underlying cause of the retinal image. Here we show that hand closure in catching virtual balls is triggered by visual angle, using an assumption of a constant ball size. As...Continue Reading

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Citations

Feb 21, 2016·Molecular and Biochemical Parasitology·Toni GabaldónPaul A M Michels
May 25, 2015·Experimental Brain Research·Cristina de la Malla, Joan López-Moliner
Oct 1, 2013·Vision Research·Joan López-MolinerMatthias S Keil
Feb 6, 2020·PloS One·Elisabeth B Knelange, Joan López-Moliner
May 16, 2017·Frontiers in Human Neuroscience·Björn Jörges, Joan López-Moliner
Mar 31, 2021·Scientific Reports·Björn JörgesMyrka Zago
Apr 27, 2021·Journal of Vision·Borja Aguado, Joan López-Moliner
Nov 17, 2021·Research Quarterly for Exercise and Sport·Benjamin Holfelder, Nadja Schott

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