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Akiyoshi’s Illusion Pages

ritsumei.ac.jp

51–60 of 65 posts

Re: Akiyoshi’s Illusion Pages

#51
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

I've noticed the same effect with stained glass, that blue tends to recede for me and red comes forward.

I spend a lot more time in churches, especially ones with stained glass, than most people, but I hadn't thought to ask if it happens to other people too.

Re: Akiyoshi’s Illusion Pages

#52
post #35

Earlier quoted context omitted.

I don't intuitively understand any illusion. I don't have conscious introspection into what the layers of neurons are doing between the retina and conscious visual perception. The layers of neurons use certain indirect cues in order to detect size, depth and movement. Those cues do their job in most circumstances, but test cases can be constructed which falsely trigger those cues. That's just an intellectual generali…

You should add shadow to the list of important cues. Something light in shadow can be the same color as something white in direct light. You can see that optical illusion in https://en.wikipedia.org/wiki/Checker_shadow_illusion . My favorite example of where shadow matters is "the dress". As https://slate.com/technology/2017/04/heres-why-people-saw-th... explains, those whose brains assumed it was in shadow saw it as…

This one drives me crazy because even having seen a picture of the same blue and black dress in direct light, my brain simply will not see this as anything but white and gold. I know I'm seeing it wrong and still can't see it right.

Re: Akiyoshi’s Illusion Pages

#53
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

If you wear glasses I suggest trying both with and without your glasses on while moving your head. For me, there is almost no effect without my glasses on. But with glasses, it is quite strong... but I'm not even sure if what I'm seeing when I have my glasses on is actually the intended effect. I've become used to that effect with blue and red light moving in opposite directions relative to each other when I move my head.

Re: Akiyoshi’s Illusion Pages

#54

Earlier quoted context omitted.

I could imagine that it will change the way you perceive things. There are experiments where people got goggles that switched the left and right eyes and people adjusted after a few days.

Or even simple glasses which turn the view upside down. Human eyes were able to adjust itself (or the image) correct way after few hours.

Don't we all actually go through this as babies? Where our mental image flips?

I don't understand why it would make any difference, from an evolutionary perspective, but apparently it does?

Re: Akiyoshi’s Illusion Pages

#55
post #52
post #35

Earlier quoted context omitted.

You should add shadow to the list of important cues. Something light in shadow can be the same color as something white in direct light. You can see that optical illusion in https://en.wikipedia.org/wiki/Checker_shadow_illusion . My favorite example of where shadow matters is "the dress". As https://slate.com/technology/2017/04/heres-why-people-saw-th... explains, those whose brains assumed it was in shadow saw it as…

This one drives me crazy because even having seen a picture of the same blue and black dress in direct light, my brain simply will not see this as anything but white and gold. I know I'm seeing it wrong and still can't see it right.

Mine has changed over the years - usually I see blue and black, but occasionally I see white and gold.

Re: Akiyoshi’s Illusion Pages

#56
post #53
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

If you wear glasses I suggest trying both with and without your glasses on while moving your head. For me, there is almost no effect without my glasses on. But with glasses, it is quite strong... but I'm not even sure if what I'm seeing when I have my glasses on is actually the intended effect. I've become used to that effect with blue and red light moving in opposite directions relative to each other when I move my…

-3.5 here, the illusion is both effective with or without glasses

Re: Akiyoshi’s Illusion Pages

#57
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

first few seconds : nothing special, just flat

then: blue ring appeared "closer" to me (very similar to a stereogram - yes)

I was able to "force" the blue ring to snap to being "behind" the red rings by rapidly blinking but the effect wouldnt stick .... the perception would slowly snap back to my default - blue in the front

Re: Akiyoshi’s Illusion Pages

#58

The second black hole one "Approaching black hole: yesterday" is stunning. I cannot believe it's a still image. http://www.psy.ritsumei.ac.jp/~akitaoka/saishin69e.html

Am I alone in not understanding this black hole one... it's a sequence of three obviously distinct still images in which the black center is larger than the previous image. Meanwhile, each image on its own is offering no kind of perceptive illusion to me...

Yes each image independently shows the illusion -- different images are only to provide a variation i guess, since some proportions work better for some people than others

I personally found the illusion not strong though definitely present

This similar illusion but done with different colors and patters was much more vivid and strong for me ...

check this out:

"Expanding Pupils" second image onwards

http://www.psy.ritsumei.ac.jp/~akitaoka/motion35e.html

Re: Akiyoshi’s Illusion Pages

#59
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

I see the red rings in front. I tried adding some depth cues to see if I could see it both ways - https://i.imgur.com/LsPtsRr.png

It kind of works, but for me it feels more like the blue ring now has a variable depth, with parts below and parts above the red rings, kind of like a piece of fabric draped over a bar.

I wonder how it feels for people who see blue in front?

Re: Akiyoshi’s Illusion Pages

#60
post #40

One of Akiyoshi Kitaoka's recent work that I found absolutely stunning is the following illusion where a ring of one colour appears to be either in front of or behind two rings of another colour: https://twitter.com/AkiyoshiKitaoka/status/16812686184854568... https://nitter.net/AkiyoshiKitaoka/status/168126861848545689... To my perception, the blue ring appears to float above the red rings. It feels a bit like an aut…

From the Kitaoka's paper:

http://www.psy.ritsumei.ac.jp/~akitaoka/Kitaoka2015_Referenc...

> More specifically, a closer object projects to a more temporal part in the retina and so does red light. This suggestion, however, made Bruecke immediately reject his hypothesis because some of his observers reported red receding with respect to blue.

> The Stiles-Crawford effect is a phenomenon that the rays entering the eye through the peripheral regions of the pupil are less efficient than those through the central region [24]. This two-factor model, which Vos [4] called the “generalized Bruecke-Einthoven explanation,” has been widely accepted, while a few authors did not approve it [25]. Many studies suggested that pupil size affects chromostereopsis [19, 21–23], which supports the generalized Bruecke-Einthoven explanation. Simonet and Campbell [26], however, did not find any consistent relationship between pupil size and chromostereopsis.

Maybe the explanation is not 100% physiological in nature.

https://arxiv.org/abs/2208.03726

Human Perception as a Phenomenon of Quantization – Diederik Aerts, Jonito Aerts Arguëlles – 2022

> For two decades, the formalism of quantum mechanics has been successfully used to describe human decision processes, situations of heuristic reasoning, and the contextuality of concepts and their combinations. The phenomenon of 'categorical perception' has put us on track to find a possible deeper cause of the presence of this quantum structure in human cognition. Thus, we show that in an archetype of human perception consisting of the reconciliation of a bottom up stimulus with a top down cognitive expectation pattern, there arises the typical warping of categorical perception, where groups of stimuli clump together to form quanta, which move away from each other and lead to a discretization of a dimension. The individual concepts, which are these quanta, can be modeled by a quantum prototype theory with the square of the absolute value of a corresponding Schrödinger wave function as the fuzzy prototype structure, and the superposition of two such wave functions accounts for the interference pattern that occurs when these concepts are combined. Using a simple quantum measurement model, we analyze this archetype of human perception, provide an overview of the experimental evidence base for categorical perception with the phenomenon of warping leading to quantization, and illustrate our analyses with two examples worked out in detail.

> in this article, we would like to pay attention to visual perception that takes place in this more primitive first-line phase and quantum structures that would be present there. A specific situation in visual perception, namely, the bi-stability that occurs when viewing figures drawn on a two-dimensional background that we nevertheless visually reconstruct into ‘seeing three dimensional entities’, of which the ‘Necker cube’ is the archetypal example, was studied within the quantum cognition approach. The presence of quantum structure was investigated and convincingly demonstrated (Conte at al., 2009; Atmanspacher & Filk, 2010).

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