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Reasoning About Visibility in Mirrors: A Comparison Between a Human Observer and a Camera.

Marco Bertamini¹, Alessandro Soranzo²

¹Department of Psychological Sciences, University of Liverpool, UK.

|June 7, 2018

Summary

People often misjudge what they can see in mirrors, overestimating visibility and underestimating viewpoint effects. Reasoning about human viewpoints in mirrors is easier than with artificial ones, suggesting social factors influence spatial reasoning.

Keywords:

Theory of Mind Venus effect allocentric bias mirrors perspective

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Area of Science:

Cognitive Psychology
Visual Perception
Spatial Reasoning

Background:

Human observers frequently err when predicting visual information in mirrors, both in real-world perception and diagrammatic reasoning.
Understanding mirror perception is crucial for cognitive science, impacting fields from robotics to human-computer interaction.

Purpose of the Study:

To investigate errors in human spatial reasoning about mirror visibility.
To examine the influence of social perspective-taking on mirror reasoning by comparing human versus artificial viewpoints.
To determine if social mechanisms, rather than automatic attention, underlie perspective-taking in mirror tasks.

Main Methods:

An illustration of a room with a mirror and objects was presented to 108 participants.
Participants identified objects visible in the mirror from a specific viewpoint.
The viewpoint was manipulated to include either a person's image or a camera, testing social perspective-taking effects.

Main Results:

Participants consistently overestimated what was visible in the mirror and underestimated the role of viewpoint.
Performance was significantly worse when reasoning about a camera viewpoint compared to a human viewpoint.
This suggests an advantage in perspective-taking when considering a human observer.

Conclusions:

Social perspective-taking appears to play a role in reasoning about mirror visibility.
Human viewpoints may be processed differently than artificial (camera) viewpoints in spatial reasoning tasks.
Findings suggest that social mechanisms, not just automatic attention, are involved in understanding reflections.