Movie illusion 13

Illusion using movies #13

since February 5, 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.

"A demo of the continuous expansion illusion from a single image"
(no color inversion)

The image appears to expand.

"A demo of the continuous expansion illusion from a single image"

The image appears to expand.

"A demo of the continuous expansion illusion from a single image"

The image appears to expand.

"A demo of the continuous expansion illusion from a single image"
(no color inversion)

The image appears to expand.

"A demo of the continuous rotation illusion from a single image"

The image appears to rotate counterclockwise.

(no color inversion)

"A demo of the continuous expansion illusion from a single image"

The image appears to expand.

"The phi part of the unknown phi in the form of reverse phi (right) alone appears to move faster than standard phi (left)"

(another demo)

"Unknown phi in the form of reverse phi (right) appears to move faster than standard phi (left)"

"Unknown phi in the form of phenomenal phenomena (right) appears to move faster than standard phi (left)"

"A demo of reverse phi and unknown phi"

All images are shown below.

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"A demo of reverse phi and unknown phi in the form of phenomenal phenomena"

Test

Thompson, P. (1982). Perceived rate of movement depends on contrast. Vision Research, 22, 377-380. Link

Abstract

The perceived rate of movement of sine wave gratings has been measured over a range of contrasts. At temporal frequencies below about 8 Hz a decrease in contrast reduces apparent velocity. At 16 Hz a reduction in contrast increases perceived velocity.

It is supposed that for each block the left ring with high luminance contrast appears to rotate faster than the right one with low luminance contrast.

How do you see?
— Akiyoshi Kitaoka (@AkiyoshiKitaoka) April 14, 2020

"Rollers 2020"

Rollers appear to rotate.

"Illusory motion-induced size illusion"

The left circle that shows apparent expansion appears to be larger than the right one that demonstrates apparent contraction.

(a variant of Mather type)

"A variety of four-stroke apparent motion demos"

The upper left ring appears to rotate counterclockwise faster than the middle and right rings, though they rotate counterclockwise at the same velocity. The lower left ring, in the central vision, appears to rotate counterclockwise at the same velocity as or slower than the middle and right rings. It appears to rotate clockwise in the peripheral vision.

( Mather type)

(a variant of Mather type)

(a variant of phenomenal phenomena)

(reversed phi)

(reversed phi: new)
Copyright Akiyoshi Kitaoka 2020 (April 18)

(a variant of phenomenal phenomena)

(apparent motion induced by local change)

(apparent motion induced by local change similar to reversed phi)

(apparent motion induced by local change #2)

(apparent motion induced by local change #2 similar to reversed phi)

"Position shift illusion induced by illusory motion"

The left ring appears to rotate counterclockwise while the right one to rotate clockwise, though they do not change their positions. Moreover, they are aligned vertically and horizontally, but the left ring appears to tilt counterclockwise slightly while the right one clockwise.

"'phi' and reversed phi"

https://www.facebook.com/akiyoshi.kitaoka/videos/10217868365635567/

cf.

No change in contast polarity, no acceleration the motion speed. Moreover, the rings in the middle column appear to rotate slower.　

a large and slow version

100 ms / frame

70 ms / frame

50 ms / frame

The left ring appears to rotate slower than the right one, though they rotate at the same velocity.

500 ms / frame

(4 frames)

(reversed phi: 4 frames, 80 ms / frame)

"Overestimation of speed of 'phi' (right)?"

Both rings rotate counterclockwise at the same velocity, but the right one appears to rotate faster than the left one.

Rotating Reversals

http://www.illusionsciences.com/2008/12/rotating-reversals.html?fbclid=IwAR2ENPMOpo8AY7cCI7vIJgFOwwP8fZJKHDqvNxdfWbgJvkrq0H5sGKctyiQ

Reversing wheels

http://crowding.github.io/thesis/

4 frames; 150 ms / frame

"Perception of contraction"

Concentric rings appears to contract, though their positions do not change.

8 frames; 70 ms / frame

4 frames; 150 ms / frame

"Perception of expansion"

Concentric rings appears to expand, though their positions do not change.

8 frames; 70 ms / frame

4 frames; 150 ms / frame

50 ms/frame

"A demo of the eight-stroke apparent motion (reversed phi) of a train scene"

The train appears to advance constantly, though this movie consists of only eight frames.

(another demo)

50 ms/frame

"A demo of the 16-stroke apparent motion (reversed phi) of a train scene"

The train appears to advance constantly, though this movie consists of 16 frames.

100 ms /frame

"A demo of the four-stroke apparent motion (reversed phi) of a train scene"

The train appears to advance constantly, though this movie consists of four frames.

(another demo)

80 ms /frame

"A demo of the four-stroke apparent motion (Mather) of a train scene"

The train appears to advance constantly, though this movie consists of only four frames.

Reference: http://www.georgemather.com/MotionDemos/FourstrokeMP4.html

Differences in perceived speed pic.twitter.com/bwOeeAnKV8
— Akiyoshi Kitaoka (@AkiyoshiKitaoka) March 11, 2020

100 ms/frame

"A demo of the reversed phi motion (Anstis) of a train scene"

The train appears to advance constantly, though this movie consists of only three frames.

Differences in perceived speed pic.twitter.com/V42VxQDRZ3
— Akiyoshi Kitaoka (@AkiyoshiKitaoka) February 4, 2020

"Illusion of perceived speed"

When observers take a train and see the front scene with a video camera, the speed of the train appears to be slower when the camera zoomed in. In contrast, the speed appears to be faster when the camera zoomed out.

speedillusion-IMG_6690.mp4

cf. expansion of logarithmically-drawn, concentric sinusoidal-lumimance gratings (1 Hz; 'expansion ratio = 1.414 (left) and 2 (right))