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.

Copyright Akiyoshi Kitaoka 2021 (February 17)


"Apparently standard (negative) motion aftereffect"

A counterclockwise moion aftereffect is observed.

Copyright Akiyoshi Kitaoka 2021 (February 17)


cf.

No moion aftereffect

Copyright Akiyoshi Kitaoka 2021 (February 16)


reverse phi

Copyright Akiyoshi Kitaoka 2021 (February 17)





a demo of the 4-stroke aparent motion

Copyright Akiyoshi Kitaoka 2021 (February 19)


"A demo of the spoked wheel illusion 2"

A clockwise moion aftereffect is observed.

Copyright Akiyoshi Kitaoka 2021 (February 16)


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.

Copyright Akiyoshi Kitaoka 2021 (February 16)


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

Copyright Akiyoshi Kitaoka 2021 (February 16)


"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).

Copyright Akiyoshi Kitaoka 2021 (February 13)

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).

Copyright Akiyoshi Kitaoka 2021 (February 13)

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



cf.

reverse phi

Copyright Akiyoshi Kitaoka 2021 (February 13)



There is no or weak motion aftereffect.

Copyright Akiyoshi Kitaoka 2021 (February 15)



"Infinite bulging"

The inset appears to keep bulging.

Copyright Akiyoshi Kitaoka 2021 (February 12)



"Infinite rotation"

The ring appears to rotate clockwise.

Copyright Akiyoshi Kitaoka 2021 (February 10)



(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.

Copyright Akiyoshi Kitaoka 2021 (February 10)


(500 ms / frame)


Y-junction-radial2020-01movie-round2-30ms.mp4

Copyright Akiyoshi Kitaoka 2020 (April 27)


(stationary image)




A demo of motion contrast

40 ms / frame, 1 cycle / 20 frames

The square image is stationary. When it appears to move rightward, this illusion is called "motion contrast".

Copyright Akiyoshi Kitaoka 2020 (April 27)



A demo of the footstep illusion

30 ms / frame, 1 cycle / 20 frames

Squares appear to repeat moving fast and slow.

Copyright Akiyoshi Kitaoka 2020 (April 24)

Anstis, S. M. (2001). Footsteps and inchworms: Illusions show that contrast modulates motion salience. Perception, 30, 785–794.



300 ms / frame



1000 ms / frame



20 ms / frame


Movie illusion 13

Movie illusion 12

Movie illusion 11

Movie illusion 10

Movie illusion 9

Movie illusion 8

Movie illusion 7

Movie illusion 6

Movie illusion 5

Movie illusion 4

Movie illusion 3

Movie illusion 2

Movie illusion


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