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Related Experiment Video

Updated: Jul 24, 2025

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

The box-circle illusion.

Chenyang Lin¹, Ladan Shams¹

¹University of California, Los Angeles, United States.

|July 10, 2023

Summary

This summary is machine-generated.

Horizontal context lines distort perceived vertical object positions, creating a novel optical illusion. Removing these contextual boxes reduces the visual misalignment of centered objects.

Keywords:

depth perception geometrical-optical illusion illusion orientation position

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Area of Science:

Visual perception
Geometrical optical illusions
Experimental psychology

Background:

Optical illusions demonstrate the brain's active interpretation of visual information.
Previous research explored illusions based on size, color, and contrast.
The role of contextual geometry in vertical misperception was less understood.

Purpose of the Study:

To introduce and describe a novel geometrical optical illusion.
To investigate how horizontal contextual elements affect perceived vertical alignment.
To explore potential mechanisms behind this visual distortion.

Main Methods:

Presentation of a novel optical illusion involving circles centered within boxes of varying widths but equal heights.
Systematic observation and description of the perceived vertical misalignment of the circles.
Comparison of perceived alignment with and without the contextual boxes.

Main Results:

Objects (circles) appeared vertically misaligned despite being physically centered.
The illusion was dependent on the horizontal dimensions of the surrounding contextual structures (boxes).
Removing the contextual boxes significantly reduced or eliminated the perceived misalignment.

Conclusions:

A new geometrical optical illusion, termed the 'contextual horizontal distortion illusion,' has been identified.
Horizontal contextual elements can significantly alter the perception of vertical position.
Further research is needed to elucidate the precise neural and cognitive mechanisms underlying this illusion.