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Related Experiment Video

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Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

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Published on: August 26, 2019

Robust size illusion produced by expanding and contracting flow fields.

Xue Dong¹, Jianying Bai², Min Bao²

¹CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing, PR China; Department of Psychology, University of Chinese Academy of Sciences, PR China.

Vision Research

|February 18, 2017

Summary

This summary is machine-generated.

A novel visual illusion demonstrates that apparent object size changes inversely with perceived motion direction. This size-motion illusion suggests optic flow processing influences our perception of size and self-motion.

Keywords:

Depth perception Motion Optic flow Size constancy Size illusion

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Area of Science:

Visual Perception
Neuroscience
Psychophysics

Background:

The perception of visual motion and size is complex.
Illusions provide insights into the mechanisms of visual processing.

Purpose of the Study:

To describe and investigate a new visual illusion involving apparent size changes.
To explore the underlying mechanisms of this size-motion illusion.

Main Methods:

Subjects observed radially moving dots within an annular window, with periodic reversals in motion direction.
Quantitative measurements of the illusion were performed.
The illusion was reproduced using natural scenes and varying motion conditions.

Main Results:

An illusion was observed where the apparent size of an enclosed region inversely changed with the perceived expansion or contraction of dots.
The illusion could not be explained by local kinetic edge energy.
Blurring motion boundaries did not consistently reverse the illusion.

Conclusions:

The illusion is likely mediated by optic flow processing and motion contrast.
Perceived self-motion (approaching or receding) may influence the apparent size of stationary objects.
This study highlights the interplay between motion perception and size constancy.