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Related Experiment Video

Updated: Jan 22, 2026

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

Published on: March 1, 2017

The Bathtub Illusion.

Marco Bertamini¹

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

|July 20, 2019

Summary

This summary is machine-generated.

Perceptual distortions can make your own little fingers appear too far away. This phenomenon, known as size-distance scaling, shows size perception strongly influences our sense of depth and distance.

Keywords:

perception of size phenomenological method size-distance visual illusion

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Area of Science:

Visual perception
Human sensory systems
Psychophysics

Background:

The perception of depth and distance is complex.
Visual cues are crucial for spatial awareness.
The brain integrates various sensory inputs to construct a spatial model.

Purpose of the Study:

To investigate a specific visual illusion involving the perceived distance of one's own fingers.
To explore the role of size-distance scaling in this phenomenon.
To understand the interplay between body knowledge and visual cues in spatial perception.

Main Methods:

Observational study of a specific visual phenomenon.
Analysis of conditions leading to the illusion.
Theoretical explanation based on principles of visual perception.

Main Results:

When fingers align in depth, the farther little finger can appear disproportionately distant.
This illusion is attributed to size-distance scaling.
Perceived finger size significantly impacts perceived distance.

Conclusions:

Size-distance scaling is a powerful factor influencing perceived distance, even overriding knowledge of one's own body.
The visual system's interpretation of size plays a critical role in depth perception.
Understanding these perceptual mechanisms offers insights into human spatial cognition.