Binocular rivalry is a phenomenon of visual perception in which perception alternates between different images presented to each eye. When one image is presented to one eye and a very different image is presented to the other, instead of the two images being seen superimposed, one image is seen for a few moments, then the other, then the first, and so on, randomly for as long as one cares to look. For example if a set of vertical lines is presented to one eye, and a set of horizontal lines to the same region of the retina of the other, alternations between the vertical and horizontal lines is seen. At transitions, brief, unstable composites of the two images may be seen; these are often organized. For example, the vertical lines may appear one at a time to obscure the horizontal lines from the left or from the right, or the horizontal lines make appear one at a time to obscure the vertical lines from the top or from the bottom. Binocular rivalry occurs between any stimuli that differ sufficiently, including simple stimuli like lines of different orientation and complex stimuli like different alphabetic letters or different pictures such as of a face and of a house. Very small differences between images, however, might yield singleness of vision and stereopsis. In recent years neuroscientists have used neuroimaging techniques and single-cell recording techniques to identify neural events responsible for the perceptual dominance of a given image and for the perceptual alternations. Visual perception is one of the senses, consisting of the ability to detect light and interpret (see) it as the perception known as sight or naked eye vision. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Stochastic, from the Greek stochos or goal, means of, relating to, or characterized by conjecture; conjectural; random. ... Human eye cross-sectional view. ... Stereopsis is the process in visual perception leading to perception of the depth or distance of objects. ... Neuroimaging is the term used for all invasive, minimally invasive and non-invasive methods and techniques used for obtaing structural and functional images of the nervous system, i. ...

Types of binocular rivalry

When the images presented to the eyes differ only in their contours, rivalry is referred to as binocular contour rivalry. When the images presented to the eyes differ only in their colours, rivalry is referred to as binocular colour rivalry. When the images presented to the eyes differ only in their lightnesses, a form of rivalry called binocular lustre may be seen. When an image is presented to one eye and a blank field to the other, the image is usually seen continuously. This is referred to as contour dominance. Occasionally however, the blank field, or even the dark field of a closed eye, can become visible, making the image invisible for about as long as it would be invisible it it were in rivalry with another image of equal stimulus strength. When an image is presented to one eye and a blank field to the other, introducing a different image onto the blank field usually results in that image being seen immediately. This is referred to as flash suppression. Color is an important part of the visual arts. ... The word luminance, a synonym for luminosity, means emitting or reflecting light. ... Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock or mineral. ...

Why binocular rivalry is interesting

Binocular rivalry has engaged scholars since it was discovered in 1593. It is of interest for its own sake as a remarkable example of variations in consciousness: clear, high-contrast images disappear and reappear at random. It interests people who see it as a key to the ancient problem of singleness of vision: why, when we have two eyes each of which can support perception by itself, we don't see two of everything and everything is not twice as bright when we have both eyes open. It interests people who see it as an example of the effects of attention, and top-down influences on perception. It interests people who see it as an example of the effects of structural properties of visual stimuli, and bottom-up influences on perception. It interests people who see it as an example of bistable perception or of multistable perception. It interests people who see it as a key to finding a neural correlate of consciousness. Consciousness is a quality of the mind generally regarded to comprise such key features as subjectivity, self-awareness, sentience, sapience, and the ability to perceive the relationship between oneself and ones environment. ... Look up Attention in Wiktionary, the free dictionary Attention is the cognitive process of selectively concentrating on one thing while ignoring other things. ... Top-down and Bottom-up are approaches to the software development process, and by extension to other procedures, mostly involving software. ... Top-down and Bottom-up are approaches to the software development process, and by extension to other procedures, mostly involving software. ... the phenomenon of alterations between distinct interpretations of the same percept , e. ... Examples of visually ambiguous patterns. ... The neural correlate of consciousness (NCC) is a term made popular by Francis Crick and Christof Koch in the early 1990s. ...

History of binocular rivalry

Binocular rivalry was discovered by Porta (1593, as cited in Wade, 1996). Porta put one book in front of one eye, and another in front of the other. He reported that he could read from one book at a time and that changing from one to the other required withdrawing the "visual virtue" from one eye and moving it to the other. According to Wade (1998), binocular colour rivalry was first reported by Le Clerk (1712). Desaguiliers (1716) also recorded it when looking at different colours from spectra in the bevel of a mirror. The clearest early description of both colour and contour rivalry was made by Dutour (1760, 1763; see translations by O'Shea, 1999a,b). To experience colour rivalry Dutour either crossed his eyes or overdiverged his eyes (a form of free fusion commonly used also at the end of the 20th century to view Magic Eye stereograms) to look at differently coloured pieces of cloth (Dutour, 1760) or differently coloured pieces of glass (Dutour, 1763). To experience contour rivalry Dutour again used free fusion of different objects or used a prism or a mirror in front of one eye to project different images into it. The first clear description of rivalry in English was by Wheatstone (e.g., 1838). Wheatstone invented the stereoscope, an optical device (in Wheatstone's case using mirrors) to present different images to the two eyes. Events May 18 - Playwright Thomas Kyds accusations of heresy lead to an arrest warrant for Christopher Marlowe. ... YOU SUCK... ALL OF YOU... HAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHHAHAHA ... The term stereogram can refer to an older type of integrated high fidelity system or music centre. ... Sir Charles Wheatstone (February 6, 1802 - October 19, 1875) was the British inventor of many innovations including the English concertina an early form of microphone the Playfair cipher (named for Lord Playfair, the person who publicized it) and the Wheatstone bridge. ... Stereo card view of Manhattan, c. ...

Early theories of binocular rivalry

Various theories were proposed to account for binocular rivalry. Porta and Dutour took it as evidence for an ancient theory of visual perception that has come to be known as suppression theory. Its essential idea is that, despite having two eyes, we see only one of everything (known as singleness of vision) because we see with one eye at a time. According to this theory, we do not normally notice the alternations between the two eyes because their images are too similar. By making the images very different, Porta and Dutour argued, this natural alternation can be seen. Wheatstone, on the other hand, supported the alternative theory of singleness of vision, fusion theory, proposed by Aristotle. Its essential idea is that we see only one of everything because the information from the two eyes is combined or fused. Wheatsone also discovered binocular stereopsis, the perception of depth arising from the lateral placement of the eyes. Wheatstone was able to prove that stereopsis depended on the different horizontal positions (the horizontal disparity) of points in the images viewed by each eye by creating the illusion of depth from flat depictions of such images displayed in his stereoscope. Such stereopsis is impossible unless information is being combined from each eye. Although Wheatstone's discovery of stereopsis supported fusion theory, he still had to account for binocular rivalry. He regarded binocular rivalry as a special case in which fusion is impossible, saying "the mind is inattentive to impressions made on one retina when it cannot combine the impressions on the two retinae together so as to occasion a perception resembling that of some external object" (p. 264). Aristotle, marble copy of bronze by Lysippos. ... Stereopsis is the process in visual perception leading to perception of the depth or distance of objects. ...

Other theories of binocular rivalry dealt more with how it occurs than why it occurs. Dutour speculated that the alternations could be controlled by attention, a theory promoted in the ninteenth century by Hermann von Helmholtz. But Dutour also speculated that the alternations could be controlled by structual properties of the images (such as by temporary fluctuations in the blur of one image, or temporary fluctuations in the luminance of one image). This theory was promoted in the ninteenth century by Helmholtz's traditional rival, Ewald Hering. Look up Attention in Wiktionary, the free dictionary Attention is the cognitive process of selectively concentrating on one thing while ignoring other things. ... Hermann von Helmholtz Hermann Ludwig Ferdinand von Helmholtz (August 31, 1821 – September 8, 1894) was a German physician and physicist. ... Blur is the name of a British rock band. ... The word luminance, a synonym for luminosity, means emitting or reflecting light. ... Ewald Hering (August 5, 1834 - January 26, 1918) was a German physiologist who did much research into color vision and spatial perception. ...

Empirical studies of binocular rivalry: B. B. Breese (1899, 1909)

The most comprehensive early study of binocular rivalry was conducted by B. B. Breese (1899, 1909). Breese quantified the amount of rivalry by requiring his observers to press keys while observing rivalry for 100-second trials. An observer pressed one key whenever and for as long as he or she saw one rival stimulus with no trace of the other, and another key whenever and for as long as he or she saw the other rival stimulus with no trace of the first. This has come to be known as recording periods of exclusive visibility. From the key-press records (Breese's were made on a kymograph drum), Breese was able to quantify rivalry in three ways: the number of periods of exclusive visibility of each stimulus (the rate of rivalry), the total duration of exclusive visibility of each stimulus, and the average duration of each period of rivalry. See also: rates (tax) A rate is a special kind of ratio, of two measurements with different units. ...

Breese first found that although observers could increase the time one rival stimulus was seen by attending to it, they could not increase the rate of that stimulus. Moreover, when he asked his observers to refrain from moving their eyes over the attended stimulus, control was abolished. When he asked observers specifically to move their eyes over one stimulus, that stimulus predominated in rivalry. He could also increase predominance of a stimulus by increasing the number of its contours, by moving it, by reducing its size, by making it brighter, and by contracting the muscles on the same side of the body as the eye viewing that stimulus. Breese also showed that rivalry occurs between afterimages. Breese also discovered the phenomenon of monocular rivalry: if the two rival stimuli are optically superimposed to the same eye and one fixates on the stimuli, then alternations in the clarity of the two stimuli are seen. Occasionally, one image disappears all together, as in binocular rivalry, although this is much rarer than in binocular rivalry. An afterimage is an optical illusion that occurs after looking away from a direct gaze at an image. ... Monocular rivalry is a phenomenon of multistable perception. ...

References

Breese, B. B. (1909). Binocular rivalry. Psychological Review, 16, 410-415.

Breese, B. B. (1899). On inhibition. Psychological Monographs, 3, 1-65.

Desaguiliers, J. T. (1716). III. A plain and easy Experiment to confirm Sir Isaac Newton’s Doctrine of the different Refrangibility of the Rays of Light. Philosophical Transactions, 348, 448-452.

Dutour, E.-F. (1763). Addition au Mémoire intitulé, Discussion d’une question d’Optique, imprimé dans le troisième Volume des Mémoires des Savan[t]s Étrangers, pages 514 & suivantes. [Addition to the Memoir entitled, Discussion on a question of Optics printed in the third Volume of Memoirs of Foreign Scientists, pages 514 and following]. Academie des Sciences. Mémoires de Mathématique et de Physique Préséntes par Divers Savants, 4, 499-511.

Dutour, É. F. (1760). Discussion d’une question d’optique. l’Académie des Sciences. Mémoires de Mathématique et de Physique Présentés par Divers Savants, 3, 514-530.

Le Clerc, S. (1712). Système de la vision. Paris: Delaulne.

O’Shea, R. P. (1999a). Translation of Dutour (1760). Dunedin, New Zealand: Department of Psychology, University of Otago. Retrieved November 25, 2002, from http://psy.otago.ac.nz/r_oshea/dutour60.html

O’Shea, R. P. (1999b). Translation of Dutour (1763). Dunedin, New Zealand: Department of Psychology, University of Otago. Retrieved November 25, 2002, from http://psy.otago.ac.nz/r_oshea/dutour63.html

Porta, J. B. (1593). De refractione. Optices parte. Libri novem. Naples: Salviani.

Wade, N. J. (1996). Descriptions of visual phenomena from Aristotle to Wheatstone. Perception, 25, 1137-1175.

Wade, N. J. (1998). Early studies of eye dominances. Laterality, 3, 97-108.

Wheatstone, C. (1838). Contributions to the physiology of vision.—Part the First. On some remarkable, and hitherto unobserved, phænomena of binocular vision. Philosophical Transactions of the Royal Society of London, 128, 371-394.

Further reading

• Alais, D & Blake R (eds.), Binocular Rivalry, MIT Press, 2005, ISBN 026201212X

Blake, R. (2001). A primer on binocular rivalry, including current controversies. Brain and Mind, 2, 5-38.

Blake, R., & Logothetis, N. K. (2001). Visual competition. Nature Reviews Neuroscience, 3, 13–21.