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Topic: Fraser spiral illusion

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	Fraser spiral illusion - New World Encyclopedia
		The Fraser spiral illusion is an optical illusion that was first described by the British psychologist James Fraser in 1908.
		In all the hitherto published visual illusions of direction, with the exception of the Chequerboard or Münsterberg illusion, the illusory lines or bands are definitely continuous, uninterrupted in character of fl or white, on a contrasting background.
		The Zollner illusion and the cafe wall illusion, like many other visual effects, are based on a similar principle in which a sequence of tilted elements causes the eye to perceive an image incorrectly.
	www.newworldencyclopedia.org /entry/Fraser_spiral_illusion (515 words)

	Fraser, James: "A new visual illusion of direction"
		In all the hitherto published visual illusions of direction, with the exception of the Chequer-borad or Münsterberg illusion, the illusory lines or bands are definitely continuous, uninterrupted in character of fl or white, on a constrasting background.
		This form of unit of direction may be conveniently (as distinguished from the 'simple unit of direction') termed a 'compound unit of direction,' its middle or rodshaped portion corresponding to the twisted cord and the triangular end portions corresponding to fl or white squares of the chequer-work background.
		This form of the illusion, in which there is a visual fusion of the twisted cord with a chequer-work background, may be termed the 'twisted cord on chequer-work background' illusion.
	varenne.tc.columbia.edu /bib/texts/fraser.html (1394 words)

	Akiyoshi's illusion pages
		Illusion news 4 (June 2006 - December 2006)
		It is my pleasure to grant permission for the use of my illusion material for papers, articles, or books if they are for educational or research purposes.
		For instance, the Ponzo illusion, if the image is the upper-converging version, is difficult to see.
	www.ritsumei.ac.jp /~akitaoka/index-e.html (1027 words)

	Optical Illusion - Visual Eye Trick
		Physiological illusions, such as the afterimages following bright lights or adapting stimuli of excessively longer alternating patterns (contingent perceptual aftereffect), are presumed to be the effects on the eyes or brain of excessive stimulation of a specific type - brightness, tilt, color, movement, and so on.
		Paradox illusions are generated by objects that are paradoxical or impossible, such as the Penrose triangle or impossible staircases seen, for example, in M. Escher's Ascending and Descending and Waterfall.
		Fictional illusions are defined as the perception of objects that are genuinely not there to all but a single observer, such as those induced by schizophrenia or a hallucinogenic substance.
	vegasociety.com /brain/optical_illusion.html (340 words)

	Fraser spiral illusion (Site not responding. Last check: )
		Fraser spiral illusion The Fraser spiral illusion is an optical illusion that was first described by the British psychologist James Fraser in 1908.
		Zollner illusion and the cafe wall illusion are based on a similar principle, like many other visual effects, in which a sequence of tilted elements causes the eye to perceive phantom twists and deviations.
		The illusion is augmented by the spiral components in the checkered background.
	www.kiwipedia.com /fraser-spiral-illusion.html (141 words)

	Optical illusion - Encyclopedia, History, Geography and Biography
		The Scintillating grid illusion or Hermann grid illusion.
		Paradox illusions are generated by objects that are paradoxical or impossible, such as the Penrose triangle or impossible staircases seen, for example, in M.
		Fictional illusions are defined as the perception of objects that are genuinely not there to all but a single observer, such as those induced by schizophrenia or a hallucinogenic substance.
	www.arikah.com /encyclopedia/Optical_illusion (658 words)

	Kids.Net.Au - Encyclopedia > Optical illusion
		Physiological illusions, such as the afterimages[?] following bright lights or adapting stimuli of prolonged alternating patterns (contingent perceptual after-effect, CAE), are the effects on the eyes or brain of prolonged stimulation of a specific type - brightness, tilt, colour, movement and so on.
		Paradox illusions offer objects that are impossible or paradoxical, such as the Penrose triangle or impossible staircase seen, for example, in the work of M.
		Fiction illusions are the perception of objects that are genuinely not there to all but a single observer, such as those induced by schizophrenia or hallucinogenic drugs.
	www.kids.net.au /encyclopedia-wiki/op/Optical_illusion?title=Ames_room_illusion (519 words)

	Illusions 2
		In the Münsterberg illusion the (straight) line appears to be tilted down towards the left side.
		This illusion depends critically on the brightness of the background.
		In this illusion by Ehrenstein (1941) the area where the lines would cross appears to be brighter -- but it's just as white as the rest of the background.
	www.markusehrenfried.de /science/generalscience/illusions2.html (225 words)

	Xona.com - Optical Illusions & Visual Phenomena
		A small collection of some of the best optical illusions (also known as visual illusions) and visual phenomena I have stumbled upon.
		Also known as the false spiral, the twisted cord illusion, and Fraser's Spiral.
		Parts of James Fraser's original paper ("A New Visual Illusion of Direction", British Journal of Psychology 2: 307-337, 1908.) have been made available by Hervé Varenneere.
	xona.com /opticalillusions (314 words)

	Spiral illusion
		Concentric circles appear to be spirals (going to the center by rotating clockwise).
		Concentric circles appear to be spirals (going to the center by rotating counterclockwise).
		Fraser, J. (1908) A new visual illusion of direction.
	www.psy.ritsumei.ac.jp /~akitaoka/uzu4e.html (200 words)

	Fraser's Spiral
		Fraser's spiral is not a spiral at all, but an illusion constructed from a group of concentric circles.
		You can break the illusion by either fling out 3 circles by pressing the "Circles" button or blocking out half the picture by pressing the "Block" button.
		You can move both the circles and the block around by clicking on the image and dragging.
	www.bu.edu /smec/lite/perception/fraser (62 words)

	Reference.com/Encyclopedia/Optical illusion
		An optical illusion is always characterized by visually perceived images that, at least in common sense terms, are deceptive or misleading.
		Paradox illusions are generated by objects that are paradoxical or impossible, such as the Penrose triangle or impossible staircases seen, for example, in M.
		Fictional illusions are defined as the perception of objects that are genuinely not there to all but a single observer, such as those induced by schizophrenia or a hallucinogen.
	www.reference.com /browse/wiki/Optical_illusion (636 words)

	Recreational mathematics
		The illusion is also known as the false spiral, or by its original name, the twisted cord illusion.
		While the image appears to be a spiral formed by a rope containing twisted strands of two different colors, it actually consists of concentric circles of twisted cords.
		The illusion is caused by random eye movements, which are independent in the horizontal and vertical directions.
	focosi.immunesig.org /learnmore_mathematics.html (1685 words)

	Optische Taeuschungen - Wikiminar
		The Rubin vase/profile illusion is an ambiguous figure/ground illusion.
		In the café wall illusion, the rows of tiles are separated by a thin line of mortar (or grout), which, for greatest effect, should be midway in luminance between the luminances of the fl and white (or blue and yellow) tiles.
		The twisted cord illusion is most likely due to orientation-sensitive simple cells in the striate cortex, which interact to combine the closely-spaced tilted lines into a single tilted line, which occurs early on in the visual system during the encoding of the position of edges and brightness differences.
	www.cg.tuwien.ac.at /courses/Seminar/WS2005/index.php?title=Optische_Taeuschungen&redirect=no (7509 words)

	Wikinfo \| Optical illusion (Site not responding. Last check: )
		Physiological illusions, such as the afterimages following bright lights or adapting stimuli of prolonged alternating patterns (contingent perceptual aftereffect, CAE), are the effects on the eyes or brain of prolonged stimulation of a specific type - brightness, tilt, colour, movement, and so on.
		Many are physiological illusions, such as the Cafe wall illusion which exploits the early visual system encoding for edges.
		Other distortions, such as converging line illusions, are more difficult to place as physiological or cognitive as the depth-cue challenges they offer are not easily placed.
	www.wikinfo.org /wiki.php?title=Optical_illusion (618 words)

	visual illusion - Encyclopedia.com (Site not responding. Last check: )
		Visual Art: Illusions of grandeur; The silhouette is one of the oldest optical tricks, but it's all the rage again.
		The illusion of increasing loudness in brief steady tones: variation with carrier frequency.
		Lichtenstein: seeing is believing: at the Museum of Contemporary Art in North Miami, a recent exhibition--replete with visually cunning paintings, works on paper and sculptures--examined Roy Lichtenstein's career-long preoccupation with spatial illusions and the science of perception.
	www.encyclopedia.com /doc/1O87-visualillusion.html (567 words)

	Pion abstract
		We have produced a spiral illusion using the Café Wall illusion, in which concentric circles that correspond to 'mortar lines' in the Café Wall figure appear as spirals.
		One is that spiral illusions are not peculiar to the Fraser illusion.
		We have also produced spiral illusions using several illusions resembling the Café Wall illusion as well as the Zöllner illusion.
	www.perceptionweb.com /abstract.cgi?id=v990026 (152 words)

	Optical Illusions Etc: free, scary, word & picture optical illusions
		Square A is exactly the same shade of grey as square B. mirage is a natural illusion that is an optical phenomenon.
		Physiological illusions, such as the afterimages following bright lights or adapting stimuli of excessively longer alternating patterns (contingent perceptual aftereffect, CAE), are the effects on the eyes or brain of excessive stimulation of a specific type - brightness, tilt, colour, movement, and so on.
		Other distortions, such as converging line illusions, are more difficult to place as physiological or cognitive as the depth-cue challenges they offer are not easily placed.
	illusionsetc.blogspot.com /2004/05/what-are-optical-illusions.html (805 words)

	Fraser spiral illusion - Encyclopedia Glossary Meaning Explanation Fraser spiral illusion
		Fraser spiral illusion - Encyclopedia Glossary Meaning Explanation Fraser spiral illusion.
		The Fraser spiral illusion is the famous spiral after-effect optical illusion based on the "motion after-effect" illusion.
		The orginal Fraser spiral illusion article can be editet
	www.encyclopedia-glossary.com /en/Fraser-spiral-illusion.html (143 words)

	Optical illusion - Psychology Wiki
		An optical illusion is characterized by visually perceived images that, at least in common sense terms, are deceptive or misleading.
		The Scintillating grid illusion or Hermann grid illusion.
		Many famous artists have worked extensively with optical illusions, including M.C. Escher, Salvador Dalí, Giuseppe Arcimboldo, Marcel Duchamp, Oscar Reutersvärd, and Charles Allan Gilbert.Optical illusion is also used in film by the technique of forced perspective.
	psychology.wikia.com /wiki/Optical_illusion (811 words)

	CRS4 Publications
		New variations of the spiral illusion are demonstrated.
		They include spiral illusions of the Cafe Wall illusion and the Zollner illusion, as well as other new orientation illusions.
		Thus the spiral illusion is not limited to the Fraser illusion.We discuss the role that detectors of spirals in a higher visual area might play in the spiral illusion.
	www.crs4.it /Publications/cgi-bin/crs4-bib.cgi?opt_style=page&opt_selectid=Brelstaff:2002:NVSa&opt_selecttype=Article (182 words)

	Visual Illusions - Magic Tricks, Illusions, Magicians.
		Illusions in visual perception occur when experiences, which people report, do not correspond to physical measurements...
		It may be that the appreciation of such visual paradoxes is one sign of that kind of creativity possessed by the...
		Visual competion --- Window of illusion --- Expanding cushions --- Slope illusion --- Classification of anomalous motion illusion --- Comprehensive classification of illusions...
	www.about-magictricks.com /Visual-Illusions.html (370 words)

	In the Eye of the Beholder: Medical Museum: University of Iowa Health Care: Sight, Illusion, and Disorder
		Observers may succumb to James Fraser's illusive spiral or set onto motion a spiral of their own choice from one of Marcel Duchamp's Rotoreliefs.
		The ultimate in illusion is revealed in photographs of everyday optical phenomena.
		Although this photograph is actually a composition of fl shapes on a white surface, the mind organizes the elements, based on past experience, into the image of a Dalmatian dog, Ronald C. James, photographer, from J. Thurston and R. Carraher, Optical Illusions and the Visual Arts.
	www.uihealthcare.com /depts/medmuseum/galleryexhibits/eyeofbeholder/13opticalillusions.html (280 words)

	Optical Illusions - Info on Fraser spiral
		Most people see this as a spiral although they are in fact a series of circles.
		Because of the way this image is drawn, the segments that make up the circles appear to tilt more than they actually do.
		Your brain makes a best guess of what is there and decides it is a spiral.
	www.at-bristol.com /Optical/Spiral_more.htm (129 words)

	Optical Illusions Disillusioned
		Optical illusions are illusions of the mind in its visual field of perception.
		The orange and purple-red shown in the upper row are the same red, and the yellowish-green and bluish green displayed in the lower row are the same green.
		So, we fixate economically as we look at the world around us; or, for that matter, the optical illusions in front of us, and hence, they trap us in their clever designs to make us perceive what is not there (or, not perceive what is there!).
	www.thirdeyehealth.com /optical-illusions.html (2614 words)

	Brain Benders: National Geographic Kids
		Scientists studying this "twisted cord" illusion, called the Fraser Spiral, think that your brain misinterprets the straight edges of the pink, blue, and white boxes.
		This causes you to think that the edges are actually bent, which creates the spiral effect.
		This illusion probably happens in an early step, when your brain is trying to figure out where the edges are.
	www.nationalgeographic.com /ngkids/trythis/brainbender/brainbender_0409.html (137 words)

	Fraser spiral
		A distortion illusion in which overlapping fl arc segments appear to form a spiral but are in reality a series of overlapping concentric circles.
		To demonstrate this, simply follow one of the curves around with your finger.
		The illusion is named after the British psychologist James Fraser (18631936) who first published it in 1908.
	www.daviddarling.info /encyclopedia/F/Fraser_spiral.html (93 words)

	Hall of Illusions (Site not responding. Last check: )
		There is no way to properly categorize illusions, as in many cases there are several underlying mechanisms contributing to an effect.
		In addition, not all illusions are completely understood.
		Illusions that distort an image's size, shape, and length.
	www.psy.dmu.ac.uk /mirrors/illusionworks/html/hall_of_illusions.html (206 words)

	Optical Illusions and Visual Phenomena
		The latter is more appropriate, because most effects have their basis in the visual pathway, not in the optics of the eye.
		Otherwise, there is a short paper: Bach and Poloschek (2006) Optical Illusions primer.
		Spoke Illusion – a motion illusion + an unexpected (?) aftereffect
	duggmirror.com /design/Over_60_amazing_optical_illusions (738 words)

	Fraser spiral illusion
		Related Topics: Zollner illusion, Optical illusion, Cafe wall illusion, James Fraser
		The Fraser spiral illusion is an optical illusion that was first described by the British psychologist James Fraser in 1908.
		However, Causes, Spiral, Regular, Colored, Phantom, Based, Visual, Similar, Described
	www.brainyencyclopedia.com /encyclopedia/f/fr/fraser_spiral_illusion.html (212 words)

	::Healthy Eyes: Optical illusion::
		This is why we sometimes think we’re seeing one thing when the reality can be quite different - our brains have been tricked.
		Optical illusions are one way of tricking the brain, and they show - often in quite startling ways - how what we think we see may not actually be the same as what’s really there at all!
		Optical illusions and explanations kindly supplied by atBristol.
	www.healthyeyes.org.uk /index.php?id=18 (134 words)

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