Abstract:
: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.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Millard AS,Sperandio I,Chouinard PAdoi
10.1007/s00221-020-05747-5subject
Has Abstractpub_date
2020-04-01 00:00:00pages
1061-1072issue
4eissn
0014-4819issn
1432-1106pii
10.1007/s00221-020-05747-5journal_volume
238pub_type
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