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Related Experiment Video

Updated: May 10, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

A short line segment squirms along a zigzag line.

Hiroyuki Ito¹, Xie Yang

¹Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan, and Research Center for Applied Perceptual Science, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan;

|June 12, 2013

Summary

Peripheral vision can distort motion perception. A short line segment moving near a zigzag line appears to squirm, demonstrating visual influence between shapes in peripheral vision.

Keywords:

assimilation corner detection line orientation motion direction motion illusion motion streak

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Area of Science:

Visual perception
Motion perception
Psychophysics

Background:

Peripheral vision plays a crucial role in spatial awareness and motion detection.
Visual illusions can reveal underlying mechanisms of perceptual processing.
The interaction between visual elements in peripheral vision is not fully understood.

Purpose of the Study:

To investigate the influence of a zigzag line on the perceived motion of a short, straight line segment in peripheral vision.
To characterize the phenomenon of nonrigid motion perception, termed the 'squirm effect'.

Main Methods:

Presenting a short straight line segment moving across a zigzag line to participants.
Observing the stimulus exclusively within the peripheral visual field.
Qualitative analysis of the perceived motion of the short line segment.

Main Results:

The moving short line segment exhibited apparent nonrigid, squirming motion when viewed peripherally.
The perceived motion, form, and orientation of the short line were influenced by the adjacent zigzag line.
This visual distortion is termed the 'squirm effect'.

Conclusions:

The visual system integrates information from surrounding elements in peripheral vision.
The 'squirm effect' highlights the dynamic and reconstructive nature of peripheral visual processing.
Form and motion of simple stimuli are context-dependent in peripheral vision.