Related Experiment Video
Updated: May 17, 2026
09:49
Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
Published on: April 16, 2014
Wriggling motion trajectory illusion.
Meeko Kuwahara1, Takao Sato, Yuko Yotsumoto
1Keio University, Graduate School of Human Relations, Tokyo, Japan.
Journal of Vision
|November 10, 2012
Summary
A novel visual motion illusion causes straight dot trajectories to appear wriggling. This "wriggling motion trajectory illusion" is enhanced by a large number of dots and their proximity.
Area of Science:
- Visual perception
- Motion perception
- Psychophysics
Background:
- Human visual system's interpretation of motion is complex.
- Illusions provide insights into perceptual mechanisms.
Purpose of the Study:
- To investigate a novel visual motion illusion.
- To characterize the conditions influencing the "wriggling motion trajectory illusion".
Main Methods:
- Six experiments were conducted.
- Participants observed hundreds of dots moving in straight, non-colliding trajectories.
- Varied parameters included dot density, distance, observer eye movements, dot type, and dot proximity.
Main Results:
- Straight trajectories were perceived as wriggling.
- The illusion was strongest with a high density of dots.
- Proximity of moving dots significantly influenced the illusion's strength.
- Illusion was independent of distance covered, eye movements, and dot type.
Conclusions:
- A novel visual motion illusion, the "wriggling motion trajectory illusion," has been identified.
- The density and proximity of moving dots are key factors in this illusion.
- This finding offers new perspectives on visual motion processing.
Related Concept Videos
01:22Non-uniform Circular Motion
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle.
For example, such accelerations...
For example, such accelerations...
01:14Uniform Circular Motion
Uniform circular motion is a specific type of motion in which an object travels in a circle with a constant speed. For example, any point on a propeller spinning at a constant rate is undergoing uniform circular motion. The second, minute, and hour hands of a watch also undergo uniform circular motion. It is hard to believe that points on these rotating objects are actually accelerating, even though the rotation rate is constant. To understand this, we must analyze the motion in terms of...
01:21Simple Harmonic Motion
Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
01:21Upward Impending Motion
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
01:26Orthogonal Trajectories
Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
01:10Relative Motion Analysis - Acceleration
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...