Rotating snakes 17

I produced several variants of "Rotating snakes" because this work seems to be preferred by many people.

since June 30, 2014

Original Research ARTICLE

Front. Psychol., 28 April 2015 |

Illusory visual motion stimulus elicits postural sway in migraine patients

Shu Imaizumi1,2, Motoyasu Honma3, Haruo Hibino1 and Shinichi Koyama1,3,4*

Although the perception of visual motion modulates postural control, it is unknown whether illusory visual motion elicits postural sway. The present study examined the effect of illusory motion on postural sway in patients with migraine, who tend to be sensitive to it. We measured postural sway for both migraine patients and controls while they viewed static visual stimuli with and without illusory motion. The participants’ postural sway was measured when they closed their eyes either immediately after (Experiment 1), or 30 s after (Experiment 2), viewing the stimuli. The patients swayed more than the controls when they closed their eyes immediately after viewing the illusory motion (Experiment 1), and they swayed less than the controls when they closed their eyes 30 s after viewing it (Experiment 2). These results suggest that static visual stimuli with illusory motion can induce postural sway that may last for at least 30 s in patients with migraine.

Imaizumi S, Honma M, Hibino H and Koyama S (2015) Illusory visual motion stimulus elicits postural sway in migraine patients. Front. Psychol. 6:542. doi: 10.3389/fpsyg.2015.00542

<December 5, 2015>

"Rotating snakes"
(version 2015)

Disks appear to rotate.

Copyright Akiyoshi Kitaoka 2003, 2015 (February 2)

Reply to a query

The illusion shown in the image consists of two illusions shown in the attached file. They belong to Type I of the optimized Fraser-Wilcox illusion, one being a motion illusion from dark to light and the other being one from light to dark.
There are two major hypotheses.
Hypothesis 1 (apparent movement hypothesis).
It is assumed that higher-contrast regions give a shorter latency to be visible than lower-contrast ones. This means that the former is seen first and the latter follows. Then, apparent movement is perceived in the direction from the former to latter.
Backus, B. T. and Oruç, I. (2005) Illusory motion from change over time in the response to contrast and luminance. Journal of Vision, 5, 1055-1069.
Conway, R. B., Kitaoka, A., Yazdanbakhsh, A., Pack, C. C., and Livingstone, M. S. (2005) Neural basis for a powerful static motion illusion. Journal of Neuroscience, 25, 5651-5656.  
Hypothesis 2 (difference-of-motion-signal hypothesis).
It is assumed that given motion signals are stronger when the retinal image is moved from higher-contrast regions to lower-contrast ones than when it is slided from lower-contrast regions to high-contrast ones. This hypothesis needs involvement of constantly multidirected involuntary eye movement to feed the motion perception system with motion signals.
Murakami, I., Kitaoka, A. and Ashida, H. (2006) A positive correlation between fixation instability and the strength of illusory motion in a static display. Vision Research, 46, 2421-2431.

<June 5, 2015>

Gladilin E and Eils R (2015) On the role of spatial phase and phase correlation in vision, illusion, and cognition. Front. Comput. Neurosci. 9:45. doi: 10.3389/fncom.2015.00045

<April 22, 2015>

"Rotating snakes for 4K displays"

Disks appear to rotate. (3840 x 2160 pixel)

Copyright Akiyoshi Kitaoka 2015(February 2)

"Rotating snakes: ru-ku-ru color"

Disks appear to rotate.

Copyright Akiyoshi Kitaoka 2014 (October 8)

"Rotating snakes: yellow"

Disks appear to rotate.

Copyright Akiyoshi Kitaoka 2014 (September 26)

"horned owl"

Eyes appear to rotate.

Copyright Akiyoshi Kitaoka 2014 (September 5)

"Rotating snakes gate"

Disks appear to rotate.

Copyright Akiyoshi .Kitaoka 2014 (June 30)

Rotating snakes 16

Rotating snakes 15

Rotating snakes 14

Rotating snakes 13

Rotating snakes 12

Rotating snakes 11

Rotating snakes 10

Rotating snakes 9

Rotating snakes 8

Rotating snakes 7

Rotating snakes 6

Rotating snakes 5

Rotating snakes 4

Rotating snakes 3

Rotating snakes 2

Rotating snakes 1

Top page