**Author(s): ** Atsuki Higashiyama |

Koichi Shimono |

Wataru Zaitsu**Journal: ** Psicológica ISSN 1576-8597

**Volume: ** 26;

**Issue: ** 1;

**Start page: ** 81;

**Date: ** 2005;

Original page**ABSTRACT**

We investigated how size and depth are perceived in a plane or convex
mirror. In Experiment 1, using a plane or convex mirror, 20 observers
viewed a separation between two objects that were presented at a constant
distance and reproduced it by a separation between other two objects in a
natural viewing situation. The mean matches generally approximated the
real size of the standard and did not equal either virtual size or visual angle of
the standard. In addition, the mean matches obtained with convex mirrors
were reduced by about 7% in comparison with those obtained with the plane
mirror. In Experiment 2, we examined whether the perceived depth in a
convex mirror is comparable to that in a plane mirror. We presented
isosceles triangles on a table and required 12 observers to observe them with
a plane or convex mirror. With the method of limits, we determined the
triangle that was perceived as an equilateral triangle. When the apexes of
isosceles triangles were directed to the observer or to depth, the ratio of
height to base was larger in convex mirrors than in the plane mirror,
whereas when the apexes were directed to left or to right, the ratio of height
to base was smaller in the convex mirrors than in the plane mirror. The
contraction of perceived depth amounted to about 6% in convex mirrors.
The results of both experiments suggest that although separation and depth
in convex mirrors appear to reduce, there is a strong tendency that visual
system recovers the optical distortions by convex mirrors.

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