Movie illusion 14

Illusion using movies #14

since April 24, 2020

Warning: This page includes real animations. Please do not keep watching them for a long time. Although this page has carefully avoided the known harmful stimuli, unknown ones might happen to be included. Never copy them.

"Apparently positive motion aftereffect"

A clockwise moion aftereffect is observed.

"Apparently standard (negative) motion aftereffect"

A counterclockwise moion aftereffect is observed.

cf.

No moion aftereffect

reverse phi

a demo of the 4-stroke aparent motion

"A demo of the spoked wheel illusion 2"

A clockwise moion aftereffect is observed.

cf.

Nishida, S. & Sato, T. (1992). Positive motion after-effect induced by bandpass-filtered random-dot kinematograms. Vision Research, 32, 1635-1646. https://www.sciencedirect.com/science/article/pii/004269899290156D?via%3Dihub

If the spokes are removed, the moion aftereffect reduces or extinguishes.

If the image is blurred, a counterclockwise moion aftereffect is observed.

"A demo of the spoked wheel illusion"

Stationary gray spokes appear to rotate counterclockwise while the background five-way radial pattern rotates clockwise. A motion aftereffect occurs not in the direction opposite to the real motion of the five-way radial pattern but in the direction opposite to the illusory motion of the gray spokes. These observations were reported by Anstis & Rogers (2011).

Anstis, S.M. & Rogers, B. (2011). Illusory rotation of a spoked wheel. i-Perception, 2, 720–723. https://doi.org/10.1068/i0483

Reverse Spoke Illusion from Michael Bach https://michaelbach.de/ot/mot-spokes/index.html

cf.

"A demo of the Takeuchi's motion analogue illusion of the Café Wall illusion"

Stationary gray spokes appear to rotate counterclockwise while the background black-and-white radial pattern rotates clockwise. A motion aftereffect occurs not in the direction opposite to the real motion of the radial pattern but in the direction opposite to the illusory motion of the gray spokes. These observations were reported by Takeuchi (1997).

Takeuchi, T. (1997) The motion analogue of the café wall illusion. Perception, 26, 569-584. https://doi.org/10.1068/p260569

cf.

reverse phi

There is no or weak motion aftereffect.

"Infinite bulging"

The inset appears to keep bulging.

"Infinite rotation"

The ring appears to rotate clockwise.

(an instance of the four-stroke apparent motion)

(stripes)

(disk)
Copyright Akiyoshi Kitaoka 2021 (February 11)

(for observation of motion aftereffect)

"Back and forth rotation"

The ring appears to move in a reciprocating motion of rotation with an angle of about 20-30 degrees, but it only repeats 0.4 degrees of rotation, negative-positive reversal, 0.4 degrees of reversal, negative-positive reversal, and so on.

(500 ms / frame)