eyes

On ne sait pas ce que peut le corps

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The new “eyes wide shut” illusion uses a standard enlarging (shaving or makeup) mirror. Close one eye and look at the closed eye in the mirror; the eye should take up most of the mirror. Switch eyes to see the other closed eye. Switch back-and-forth a few times, then open both eyes. You see an open eye. Which eye is it? To find out, close one eye. Whichever you close, that’s the eye you see. How can this be possible? The brain is fusing two images of the two eyes.

{ Perception | Continue reading | Thanks Brad! }

However, no one has hitherto laid down the limits to the powers of the body, that is, no one has as yet been taught by experience what the body can accomplish solely by the laws of nature, in so far as she is regarded as extension. No one hitherto has gained such an accurate knowledge of the bodily mechanism, that he can explain all its functions; nor need I call attention to the fact that many actions are observed in the lower animals, which far transcend human sagacity, and that somnambulists do many things in their sleep, which they would not venture to do when awake: these instances are enough to show, that the body can by the sole laws of its nature do many things which the mind wonders at.

Again, no one knows how or by what means the mind moves the body, nor how many various degrees of motion it can impart to the body, nor how quickly it can move it.

{ Spinoza, Ethics, III, Proposition II, Scholium | Continue reading }

unrelated { eye colour may not be a priority when choosing a partner }

Time to rebuild the

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Across four experiments participants chose between two versions of a stimulus which either had an attractive left side or an attractive right side. […]

In each experiment participants showed a significant bias to choose the stimulus with an attractive left side more than the stimulus with an attractive right side. The leftward bias emerged at age 10/11, was not caused by a systematic asymmetry in the perception of colourfulness or complexity, and was stronger when the difference in attractiveness between the left and right sides was larger.

The results are relevant to the aesthetics of product and packaging design and show that leftward biases extend to the perceptual judgement of everyday items. Possible causes of the leftward bias for attractiveness judgements are discussed and it is suggested that the size of the bias may not be a measure of the degree of hemispheric specialization.

{ Laterality | Continue reading }

art { Adrian Piper, Catalysis III, 1970 }

What then can Kant mean by his mysterious suggestion that ‘objects must conform to our cognition’?

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The image of the world that we see is continuously deformed and fragmented by foreshortenings, partial overlapping, and so on, and must be constantly reassembled and interpreted; otherwise, it could change so much that we would hardly recognize it. Since pleasure has been found to be involved in visual and cognitive information processing, the possibility is considered that anhedonia (the reduction of the ability to feel pleasure) might interfere with the correct reconstruction and interpretation of the image of the environment and alter its appearance.

{ Schizophrenia Research and Treatment | Continue reading }

First she let her hair fal and down it flussed to her feet its teviots winding coils

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Eye movements of 105 heterosexual undergraduate students (36 males) were monitored while viewing photographs of men and women identified as a potential mate or a potential friend. Results showed that people looked at the head and chest more when assessing potential mates and looked at the legs and feet more when assessing potential friends.

{ Archives of Sexual Behavior | Continue reading }

photo { Michelle Pfeiffer photographed by Jim Britt, 1979 }

‘Infinite—nothing.’ –Pascal

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The urge to be permanently blind is an extremely rare mental health disturbance. The underlying cause of this desire has not been determined yet. […] Only 5 people with an urge to be blind were found to participate in the study (4 female, 1 male). […]

The hypothesis that people with a desire for blindness suffer from a significantly higher visual overload in activities of daily living than visually healthy subjects was confirmed.

{ Case Reports in Ophthalmology | Continue reading }

art { Douglas Huebler, Variable Piece #44 / Global, 1971 | more }

An eye like Mars

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In 2012, a genetic analysis confirmed that Concetta’s enhanced color vision can be explained by a genetic quirk that causes her eyes to produce four types of cone cells, instead of the regular three which underpin colour vision in most humans. […]

Women with four cone types in their retinas are actually more common than we think. Researchers estimate that they represent as much as 12% of the female population. […] A woman has the potential to produce four cone types because she inherits two X-chromosomes. […]

The three cone types that most of us have in our retinas allow us to see millions of colours. Each cone’s membrane is packed with molecules, called opsins, which absorb lights of some wavelengths and cause the cone to send electrical signals to the brain. […]

Four cones don’t automatically grant you superior color vision. […] Only one of the seven women with four cones behaved as if she actually perceived differences between the colour mixtures that were invisible to everyone apart from her sons.

{ The Neurosphere | Continue reading }

Apollo Creed: Now, when we fought, you had that eye of the tiger, man

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Criminal investigations often use photographic evidence to identify suspects. Here we combined robust face perception and high-resolution photography to mine face photographs for hidden information. By zooming in on high-resolution face photographs, we were able to recover images of unseen bystanders from reflections in the subjects’ eyes.

To establish whether these bystanders could be identified from the reflection images, we presented them as stimuli in a face matching task (Experiment 1). Accuracy in the face matching task was well above chance (50%), despite the unpromising source of the stimuli. […] In a test of spontaneous recognition (Experiment 2), observers could reliably name a familiar face from an eye reflection image.

For crimes in which the victims are photographed (e.g., hostage taking, child sex abuse), reflections in the eyes of the photographic subject could help to identify perpetrators.

{ PLOS | Continue reading }

Fame means millions of people have the wrong idea of who you are

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The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings. It is an aftereffect requiring a period of induction to produce it. For example, if someone alternately looks at a red horizontal grating and a green vertical grating for a few minutes, a black-and-white horizontal grating will then look greenish and a black-and-white vertical grating will then look pinkish. The effect is remarkable for often lasting an hour or more, and in some cases after prolonged exposure to the grids, the effect can last up to three and a half months

{ Wikipedia | Continue reading | via Brad Weslake }

Epstein had already demonstrated that the continuous and the discontinuous were never opposed to each other in cinema. What are opposed, or at least distinguished, are rather two ways of reconciling them.

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Movies are, for the most part, made up of short runs of continuous action, called shots, spliced together with cuts. With a cut, a filmmaker can instantaneously replace most of what is available in your visual field with completely different stuff. This is something that never happened in the 3.5 billion years or so that it took our visual systems to develop. You might think, then, that cutting might cause something of a disturbance when it first appeared. And yet nothing in contemporary reports suggests that it did. […]

What if we could go back in time and collect the reactions of naïve viewers on their very first experience with film editing?

It turns out that we can, sort of. There are a decent number of people on the planet who still don’t have TVs, and the psychologists Sermin Ildirar and Stephan Schwan have capitalised on their existence to ask how first-time viewers experience cuts. […] There was no evidence that the viewers found cuts in the films to be shocking or incomprehensible. […]

I think the explanation is that, although we don’t think of our visual experience as being chopped up like a Paul Greengrass fight sequence, actually it is.

Simply put, visual perception is much jerkier than we realise. First, we blink. Blinks happen every couple of seconds, and when they do we are blind for a couple of tenths of a second. Second, we move our eyes. Want to have a little fun? Take a close-up selfie video of your eyeball while you watch a minute’s worth of a movie on your computer or TV. You’ll see your eyeball jerking around two or three times every second.

{ Aeon | Continue reading }

Against those who defined Italian neo-realism by its social content, Bazin put forward the fundamental requirement of formal aesthetic criteria. According to him, it was a matter of a new form of reality, said to be dispersive, elliptical, errant or wavering, working in blocs, with deliberately weak connections and floating events. The real was no longer represented or reproduced but “aimed at.” Instead of representing an already deciphered real, neo-realism aimed at an always ambiguous, to be deciphered, real; this is why the sequence shot tended to replace the montage of representations. […]

[I]n Umberto D, De Sica constructs the famous sequence quoted as an example by Bazin: the young maid going into the kitchen in the morning, making a series of mechanical, weary gestures, cleaning a bit, driving the ants away from a water fountain, picking up the coffee grinder, stretching out her foot to close the door with her toe. And her eyes meet her pregnant woman’s belly, and it is as though all the misery in the world were going to be born. This is how, in an ordinary or everyday situation, in the course of a series of gestures, which are insignificant but all the more obedient to simple sensory-motor schemata, what has suddenly been brought about is a pure optical situation to which the little maid has no response or reaction. The eyes, the belly, that is what an encounter is … […] The Lonely Woman [Viaggio in ltalia] follows a female tourist struck to the core by the simple unfolding of images or visual cliches in which she discovers something unbearable, beyond the limit of what she can person- ally bear. This is a cinema of the seer and no longer of the agent.

What defines neo-realism is this build-up of purely optical situations (and sound ones, although there was no synchronized sound at the start of neo-realism), which are fundamentally distinct from the sensory-motor situations of the action-image in the old realism. […]

It is clear from the outset that cinema had a special relationship with belief. […] The modern fact is that we no longer believe in this world. We do not even believe in the events which happen to us, love, death, as if they only halfconcerned us. It is not we who make cinema; it is the world which looks to us like a bad film. […] The link between man and the world is broken. Henceforth, this link must become an object of belief: it is the impossible which can only be restored within a faith. Belief is no longer addressed to a different or transformed world. Man is in the world as if in a pure optical and sound situation.

{ Gilles Deleuze, Cinema 2, The Time-Image, 1985 | PDF, 17.2 MB }

Will the sun ever shine in the blind man’s eyes when he cries?

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Japan’s House Foods Group Inc. said it has developed onions that release extremely low amount of tear-inducing compounds. […]

[T]he resulting onions have the added benefit of not leaving a strong smell on the cook’s hands or the breath of those who eat them.

{ WSJ | Continue reading }

related { 1,000-year-old onion and garlic eye remedy kills MRSA }

art { Max Bill, untitled, 1967 }

The boots to them, them in the bar

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Our eyes are drawn to several dimensions of an object–such as color, texture, and luminance–even when we need to focus on only one of them, researchers at New York University and the University of Pennsylvania have found. The study, which appears in the journal Current Biology, points to the ability of our visual system to integrate multiple components of an item while underscoring the difficulty we have in focusing on a particular aspect of it.

{ EurekAlert | Continue reading }

photo { George Pitts }

Plato has Socrates describe a gathering of people who have lived chained to the wall of a cave all of their lives, facing a blank wall

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We assume that we can see the world around us in sharp detail. In fact, our eyes can only process a fraction of our surroundings precisely. In a series of experiments, psychologists at Bielefeld University have been investigating how the brain fools us into believing that we see in sharp detail. The results have been published in the scientific magazine ‘Journal of Experimental Psychology: General.’ Its central finding is that our nervous system uses past visual experiences to predict how blurred objects would look in sharp detail.

{ Universität Bielefeld | Continue reading }

related { Scientists have found “hidden” brain activity that can indicate if a vegetative patient is aware }