The Eyes Wide Shut Illusion

Perception
Shaul Hochstein

Abstract

The new "eyes wide shut" illusion uses a standard enlarging (shaving or makeup) mirror. Close one eye and look at the closed eye in the mirror; the eye should take up most of the mirror. Switch eyes to see the other closed eye. Switch back-and-forth a few times, then open both eyes. You see an open eye. Which eye is it? To find out, close one eye. Whichever you close, that's the eye you see. How can this be possible? The brain is fusing two images of the two eyes! The illusion depends on (a) binocular fusion: The brain combines two images to a single percept; (b) symmetry: Mirrors don't affect appearance of left-right symmetric objects and the eyes are sufficiently left-right symmetric for the brain to combine them. Why aren't the lingering asymmetries sufficient to prevent fusion? (c) Only vision with scrutiny affords conscious access to scene details. Consistent with reverse hierarchy theory, vision at a glance grants conscious perception of the gist of the scene, integrating images of nonperfectly symmetric eyes.

References

Aug 1, 1992·Journal of Experimental Psychology. Human Perception and Performance·J E RaymondK M Arnell
Dec 24, 1996·Proceedings of the National Academy of Sciences of the United States of America·I KovácsA Fehér
Dec 19, 1998·BMJ : British Medical Journal·R Gregory
Dec 26, 2001·Annual Review of Psychology·Ronald A Rensink
Dec 7, 2002·Neuron·Shaul Hochstein, Merav Ahissar
Oct 4, 2006·Vision Research·Einat Shneor, Shaul Hochstein
Aug 12, 2008·Vision Research·Anthony Chad SampanesBruce Bridgeman
Dec 7, 2011·Frontiers in Human Neuroscience·Michal Wolf, Shaul Hochstein

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