visual sensation

視覚

WordNet

1. a state of widespread public excitement and interest; "the news caused a sensation"
2. an unelaborated elementary awareness of stimulation; "a sensation of touch" (同)esthesis, aesthesis, sense experience, sense impression, sense datum
3. a general feeling of excitement and heightened interest; "anticipation produced in me a sensation somewhere between hope and fear"

PrepTutorEJDIC

1. 〈U〉〈C〉(五感による)『感覚』,知覚 / 〈C〉(¨の)感じ,気持ち / 〈C〉〈U〉大評判,センセーション;大評判になった人(物,事)
2. 『視覚の』 / 目に見える;目で見た / 有視界の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/14 01:59:17」(JST)

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For links also to non-mammalian visual systems, see Eye.

The visual system includes the eyes, the connecting pathways through to the visual cortex and other parts of the brain. The illustration shows the mammalian system.

The visual system is the part of the central nervous system which gives organisms the ability to process visual detail, as well as enabling the formation of several non-image photo response functions. It detects and interprets information from visible light to build a representation of the surrounding environment. The visual system carries out a number of complex tasks, including the reception of light and the formation of monocular representations; the buildup of a nuclear binocular perception from a pair of two dimensional projections; the identification and categorization of visual objects; assessing distances to and between objects; and guiding body movements in relation to the objects seen. The psychological process of visual information is known as visual perception, a lack of which is called blindness. Non-image forming visual functions, independent of visual perception, include the pupillary light reflex (PLR) and circadian photoentrainment.

Introduction

The human eye

The image projected onto the retina is inverted due to the optics of the eye.

This article mostly describes the visual system of mammals, although other "higher" animals have similar visual systems (see bird vision, vision in fish, mollusc eye, reptile vision). In the case of mammals (including humans), the visual system consists of:

• The eye, especially the retina
• The optic nerve
• The optic chiasma
• The optic tract
• The lateral geniculate body
• The optic radiation
• The visual cortex
• The visual association cortex.

Different species are able to see different parts of the light spectrum; for example, bees can see into the ultraviolet, while pit vipers can accurately target prey with their pit organs, which are sensitive to infrared radiation. The eye of a swordfish can generate heat to better cope with detecting their prey at depths of 2000 feet.

History

In the second half of the 19th century, many motifs of the nervous system were identified such as the neuron doctrine and brain localization, which related to the neuron being the basic unit of the nervous system and functional localisation in the brain, respectively. These would become tenets of the fledgling neuroscience and would support further understanding of the visual system.

The notion that the cerebral cortex is divided into functionally distinct cortices now known to be responsible for capacities such as touch (somatosensory cortex), movement (motor cortex), and vision (visual cortex), was first proposed by Franz Joseph Gall in 1810. Evidence for functionally distinct areas of the brain (and, specifically, of the cerebral cortex) mounted throughout the 19th century with discoveries by Paul Broca of the language center (1861), and Gustav Fritsch and Edouard Hitzig of the motor cortex (1871). Based on selective damage to parts of the brain and the functional effects this would produce (lesion studies), David Ferrier proposed that visual function was localized to the parietal lobe of the brain in 1876. In 1881, Hermann Munk more accurately located vision in the occipital lobe, where the primary visual cortex is now known to be.

Biology of the visual system

Anterior visual pathway

The anterior visual pathway refers to pre-geniculate structures (before the lateral geniculate nucleus).

Anterior segment of eye

Main articles: Eye and Anterior segment of eyeball

Light entering the eye is refracted as it passes through the cornea. It then passes through the pupil (controlled by the iris) and is further refracted by the lens. The cornea and lens act together as a compound lens to project an inverted image onto the retina.

Retina

S. Ramón y Cajal, Structure of the Mammalian Retina, 1900

Main article: Retina

The retina consists of a large number of photoreceptor cells which contain particular protein molecules called opsins. In humans, two types of opsins are involved in conscious vision: rod opsins and cone opsins. (A third type, melanopsin in some of the retinal ganglion cells (RGC), part of the body clock mechanism, is probably not involved in conscious vision, as these RGC do not project to the lateral geniculate nucleus (LGN) but to the pretectal olivary nucleus (PON).) An opsin absorbs a photon (a particle of light) and transmits a signal to the cell through a signal transduction pathway, resulting in hyper-polarization of the photoreceptor. (For more information, see Photoreceptor cell).

Rods and cones differ in function. Rods are found primarily in the periphery of the retina and are used to see at low levels of light. Cones are found primarily in the center (or fovea) of the retina. There are three types of cones that differ in the wavelengths of light they absorb; they are usually called short or blue, middle or green, and long or red. Cones are used primarily to distinguish color and other features of the visual world at normal levels of light.

In the retina, the photo-receptors synapse directly onto bipolar cells, which in turn synapse onto ganglion cells of the outermost layer, which will then conduct action potentials to the brain. A significant amount of visual processing arises from the patterns of communication between neurons in the retina. About 130 million photo-receptors absorb light, yet roughly 1.2 million axons of ganglion cells transmit information from the retina to the brain. The processing in the retina includes the formation of center-surround receptive fields of bipolar and ganglion cells in the retina, as well as convergence and divergence from photoreceptor to bipolar cell. In addition, other neurons in the retina, particularly horizontal and amacrine cells, transmit information laterally (from a neuron in one layer to an adjacent neuron in the same layer), resulting in more complex receptive fields that can be either indifferent to color and sensitive to motion or sensitive to color and indifferent to motion.

Mechanism of generating visual signals: The retina adapts to change in light through the use of the rods. In the dark, the chromophobe retinal has a bent shape called cis-retinal. When light is present, the retinal changes to a straight form called trans-retinal and breaks away from the opsin. This is called bleaching because the purified rhodopsin changes from violet to colorless in the light. At baseline in the dark, the rhodopsin absorbs no light and releases glutamate which inhibits the bipolar cell. This inhibits the release of neurotransmitters from the bipolar cells to the ganglion cell. When there is light present, glutamate secretion ceases thus no longer inhibiting the bipolar cell from releasing neurotransmitters to the ganglion cell and therefore an image can be detected.

The final result of all this processing is five different populations of ganglion cells that send visual (image-forming and non-image-forming) information to the brain:

1. M cells, with large center-surround receptive fields that are sensitive to depth, indifferent to color, and rapidly adapt to a stimulus;
2. P cells, with smaller center-surround receptive fields that are sensitive to color and shape;
3. K cells, with very large center-only receptive fields that are sensitive to color and indifferent to shape or depth;
4. another population that is intrinsically photosensitive; and
5. a final population that is used for eye movements.

A 2006 University of Pennsylvania study calculated the approximate bandwidth of human retinas to be about 8960 kilobits per second, whereas guinea pig retinas transfer at about 875 kilobits.

In 2007 Zaidi and co-researchers on both sides of the Atlantic studying patients without rods and cones, discovered that the novel photoreceptive ganglion cell in humans also has a role in conscious and unconscious visual perception. The peak spectral sensitivity was 481 nm. This shows that there are two pathways for sight in the retina – one based on classic photoreceptors (rods and cones) and the other, newly discovered, based on photo-receptive ganglion cells which act as rudimentary visual brightness detectors.

Photochemistry

Main article: Visual cycle

The functioning of a camera is often compared with the workings of the eye, mostly since both focus light from external objects in the field of view onto a light-sensitive medium. In the case of the camera, this medium is film or an electronic sensor; in the case of the eye, it is an array of visual receptors. With this simple geometrical similarity, based on the laws of optics, the eye functions as a transducer, as does a CCD camera.

In the visual system, retinal, technically called retinene₁ or "retinaldehyde", is a light-sensitive molecule found in the rods and cones of the retina. Retinal is the fundamental structure involved in the transduction of light into visual signals, i.e. nerve impulses in the ocular system of the central nervous system. In the presence of light, the retinal molecule changes configuration and as a result a nerve impulse is generated.

Optic nerve

Main article: Optic nerve

Information flow from the eyes (top), crossing at the optic chiasma, joining left and right eye information in the optic tract, and layering left and right visual stimuli in the lateral geniculate nucleus. V1 in red at bottom of image. (1543 image from Andreas Vesalius' Fabrica)

The information about the image via the eye is transmitted to the brain along the optic nerve. Different populations of ganglion cells in the retina send information to the brain through the optic nerve. About 90% of the axons in the optic nerve go to the lateral geniculate nucleus in the thalamus. These axons originate from the M, P, and K ganglion cells in the retina, see above. This parallel processing is important for reconstructing the visual world; each type of information will go through a different route to perception. Another population sends information to the superior colliculus in the midbrain, which assists in controlling eye movements (saccades) as well as other motor responses.

A final population of photosensitive ganglion cells, containing melanopsin, sends information via the retinohypothalamic tract (RHT) to the pretectum (pupillary reflex), to several structures involved in the control of circadian rhythms and sleep such as the suprachiasmatic nucleus (SCN, the biological clock), and to the ventrolateral preoptic nucleus (VLPO, a region involved in sleep regulation). A recently discovered role for photoreceptive ganglion cells is that they mediate conscious and unconscious vision – acting as rudimentary visual brightness detectors as shown in rodless coneless eyes.

Optic chiasm

Main article: Optic chiasm

The optic nerves from both eyes meet and cross at the optic chiasm, at the base of the hypothalamus of the brain. At this point the information coming from both eyes is combined and then splits according to the visual field. The corresponding halves of the field of view (right and left) are sent to the left and right halves of the brain, respectively, to be processed. That is, the right side of primary visual cortex deals with the left half of the field of view from both eyes, and similarly for the left brain. A small region in the center of the field of view is processed redundantly by both halves of the brain.

Optic tract

Main article: Optic tract

Information from the right visual field (now on the left side of the brain) travels in the left optic tract. Information from the left visual field travels in the right optic tract. Each optic tract terminates in the lateral geniculate nucleus (LGN) in the thalamus.

Six layers in the LGN

Lateral geniculate nucleus

Main article: lateral geniculate nucleus

The lateral geniculate nucleus (LGN) is a sensory relay nucleus in the thalamus of the brain. The LGN consists of six layers in humans and other primates starting from catarhinians, including cercopithecidae and apes. Layers 1, 4, and 6 correspond to information from the contralateral (crossed) fibers of the nasal retina (temporal visual field); layers 2, 3, and 5 correspond to information from the ipsilateral (uncrossed) fibers of the temporal retina (nasal visual field). Layer one (1) contains M cells which correspond to the M (magnocellular) cells of the optic nerve of the opposite eye and are concerned with depth or motion. Layers four and six (4 & 6) of the LGN also connect to the opposite eye, but to the P cells (color and edges) of the optic nerve. By contrast, layers two, three and five (2, 3, & 5) of the LGN connect to the M cells and P (parvocellular) cells of the optic nerve for the same side of the brain as its respective LGN. Spread out, the six layers of the LGN are the area of a credit card and about three times its thickness. The LGN is rolled up into two ellipsoids about the size and shape of two small birds' eggs. In between the six layers are smaller cells that receive information from the K cells (color) in the retina. The neurons of the LGN then relay the visual image to the primary visual cortex (V1) which is located at the back of the brain (posterior end) in the occipital lobe in and close to the calcarine sulcus. The LGN is not just a simple relay station but it is also a center for processing; it receives reciprocal input from the cortical and subcortical layers and reciprocal innervation from the visual cortex.

Scheme of the optic tract with image being decomposed on the way, up to simple cortical cells (simplified).

Posterior visual pathway

The posterior visual pathway refers to post-geniculate structures (after the lateral geniculate nucleus).

Optic radiation

Main article: Optic radiation

The optic radiations, one on each side of the brain, carry information from the thalamic lateral geniculate nucleus to layer 4 of the visual cortex. The P layer neurons of the LGN relay to V1 layer 4C β. The M layer neurons relay to V1 layer 4C α. The K layer neurons in the LGN relay to large neurons called blobs in layers 2 and 3 of V1.

There is a direct correspondence from an angular position in the field of view of the eye, all the way through the optic tract to a nerve position in V1. At this juncture in V1, the image path ceases to be straightforward; there is more cross-connection within the visual cortex.

Visual cortex

Main article: Visual cortex

Visual cortex:

V1; V2; V3; V4; V5 (also called MT)

The visual cortex is the largest system in the human brain and is responsible for processing the visual image. It lies at the rear of the brain (highlighted in the image), above the cerebellum. The region that receives information directly from the LGN is called the primary visual cortex, (also called V1 and striate cortex). Visual information then flows through a cortical hierarchy. These areas include V2, V3, V4 and area V5/MT (the exact connectivity depends on the species of the animal). These secondary visual areas (collectively termed the extrastriate visual cortex) process a wide variety of visual primitives. Neurons in V1 and V2 respond selectively to bars of specific orientations, or combinations of bars. These are believed to support edge and corner detection. Similarly, basic information about color and motion is processed here.

Heider, et al. (2002) have found that neurons involving V1, V2, and V3 can detect stereoscopic illusory contours; they found that stereoscopic stimuli subtending up to 8° can activate these neurons.

Visual cortex is active even during resting state fMRI.

Visual association cortex

Main article: Two Streams hypothesis

As visual information passes forward through the visual hierarchy, the complexity of the neural representations increases. Whereas a V1 neuron may respond selectively to a line segment of a particular orientation in a particular retinotopic location, neurons in the lateral occipital complex respond selectively to complete object (e.g., a figure drawing), and neurons in visual association cortex may respond selectively to human faces, or to a particular object.

Along with this increasing complexity of neural representation may come a level of specialization of processing into two distinct pathways: the dorsal stream and the ventral stream (the Two Streams hypothesis, first proposed by Ungerleider and Mishkin in 1982). The dorsal stream, commonly referred to as the "where" stream, is involved in spatial attention (covert and overt), and communicates with regions that control eye movements and hand movements. More recently, this area has been called the "how" stream to emphasize its role in guiding behaviors to spatial locations. The ventral stream, commonly referred as the "what" stream, is involved in the recognition, identification and categorization of visual stimuli.

Intraparietal sulcus (red)

However, there is still much debate about the degree of specialization within these two pathways, since they are in fact heavily interconnected.

Horace Barlow proposed the efficient coding hypothesis in 1961 as a theoretical model of sensory coding in the brain.

The default mode network is a network of brain regions that are active when an individual is awake and at rest. The visual system's default mode can be monitored during resting state fMRI: Fox, et al. (2005) have found that "The human brain is intrinsically organized into dynamic, anticorrelated functional networks'", in which the visual system switches from resting state to attention.

In the parietal lobe, the lateral and ventral intraparietal cortex are involved in visual attention and saccadic eye movements. These regions are in the Intraparietal sulcus (marked in red in the image to the right).

Visual system and balance

Along with proprioception and vestibular function, the visual system plays an important role in the ability of an individual to control balance and maintain an upright posture. When these three conditions are isolated and balance is tested, it has been found that vision is the most significant contributor to balance, playing a bigger role than either of the two other intrinsic mechanisms. The clarity with which an individual can see his environment, as well as the size of the visual field, the susceptibility of the individual to light and glare, and poor depth perception play important roles in providing a feedback loop to the brain on the body's movement through the environment. Anything that affects any of these variables can have a negative effect on balance and maintaining posture. This effect has been seen in research involving elderly subjects when compared to young controls, in glaucoma patients compared to age matched controls, cataract patients pre and post surgery, and even something as simple as wearing safety goggles. Monocular vision (one eyed vision) has also been shown to negatively impact balance, which was seen in the previously referenced cataract and glaucoma studies, as well as in healthy children and adults.

According to Pollock et al. (2010) stroke is the main cause of specific visual impairment, most frequently visual field loss (homonymous hemianopia- a visual field defect). Nevertheless, evidence for the efficacy of cost-effective interventions aimed at these visual field defects is still inconsistent.

Human visual system

Components

Three part system hypothesis of visual perceptions

• First system - movement, location and spatial organisation
• Second system - colour perception
• Third system - perception of shapes

Development

See infant vision.

Aging

See visual development with age.

See also

• Achromatopsia
• Akinetopsia
• Apperceptive agnosia
• Associative visual agnosia
• Asthenopia
• Astigmatism
• Color blindness
• Echolocation
• Computer vision
• Helmholtz–Kohlrausch effect - how color balance affects vision
• Magnocellular cell
• Memory-prediction framework
• Prosopagnosia
• Scotopic sensitivity syndrome
• Recovery from blindness
• Visual agnosia
• Visual modularity
• Visual perception
• Visual processing

References

Further reading

• Davison JA, Patel AS, Cunha JP, Schwiegerling J, Muftuoglu O (July 2011). "Recent studies provide an updated clinical perspective on blue light-filtering IOLs". Graefes Arch. Clin. Exp. Ophthalmol. 249 (7): 957–68. doi:10.1007/s00417-011-1697-6. PMC 3124647. PMID 21584764. 
• Hatori M, Panda S (October 2010). "The emerging roles of melanopsin in behavioral adaptation to light". Trends Mol Med 16 (10): 435–46. doi:10.1016/j.molmed.2010.07.005. PMC 2952704. PMID 20810319. 
• Hubel, David H. (1995). Eye, brain, and vision. New York: Scientific American Library. ISBN 0-7167-6009-6. OCLC 32806252. 
• Marr, David; Ullman, Shimon;Poggio, Tomaso (2010). Vision: A Computational Investigation into the Human Representation and Processing of Visual Information. Cambridge, Mass: The MIT Press. ISBN 0-262-51462-1. OCLC 472791457. 
• Rodiek, R.W. (1988). "The Primate Retina". Comparative Primate Biology. Neurosciences (New York: A.R. Liss) 4 . (H.D. Steklis and J. Erwin, editors.) pp. 203–278.
• Schmolesky, Matthew. "The Primary Visual Cortex". Retrieved 2005-01-01 .
• Tovée, Martin J. (2008). An introduction to the visual system. Cambridge, UK: Cambridge University Press. ISBN 0-521-88319-9. OCLC 185026571. 
• Vesalius, Andreas (1543). "De Humani Corporis Fabrica (On the Workings of the Human Body)" 
• Wiesel, Torsten; Hubel, David H. (1963). "The effects of visual deprivation on the morphology and physiology of cell's lateral geniculate body". Journal of Neurophysiology 26: 978–993. PMID 14084170 .

External links

• "Webvision: The Organization of the Retina and Visual System" – John Moran Eye Center at University of Utah
• VisionScience.com – An online resource for researchers in vision science.
• Journal of Vision – An online, open access journal of vision science.
• Hagfish research has found the “missing link” in the evolution of the eye. See: Nature Reviews Neuroscience.
• Valentin Dragoi. "Chapter 14: Visual Processing: Eye and Retina". Neuroscience Online, the Open-Access Neuroscience Electronic Textbook. The University of Texas Health Science Center at Houston (UTHealth). Retrieved 27 April 2014. 

UpToDate Contents

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• 1. 一過性黒内障（一過性単眼または両眼視力低下） amaurosis fugax transient monocular or binocular visual loss
• 2. 成人における詳細な神経学的検査 the detailed neurologic examination in adults
• 3. 幼児および小児における視覚の発達および視力評価 visual development and vision assessment in infants and children
• 4. 眼の充血（red eye）の評価 evaluation of the red eye
• 5. 成人における転換性障害：臨床的特徴、評価、および合併症 conversion disorder in adults clinical features assessment and comorbidity

English Journal

• Acute Hydrops With Corneal Perforation in Post-LASIK Ectasia.

• Gupta C1, Tanaka TS, Elner VM, Soong HK.
• Cornea.Cornea.2015 Jan;34(1):99-100.
• PURPOSE:: To report a case of corneal hydrops with perforation in a patient with ectasia after undergoing laser in situ keratomileusis (LASIK).METHODS:: An observational study with clinical, optical coherence tomographic, and histopathologic findings.RESULTS:: A 41-year-old woman had an acute onset
• PMID 25357081

• The physics of Cerenkov light production during proton therapy.

• Helo Y1, Kacperek A, Rosenberg I, Royle G, Gibson AP.
• Physics in medicine and biology.Phys Med Biol.2014 Dec 7;59(23):7107-23. doi: 10.1088/0031-9155/59/23/7107. Epub 2014 Nov 3.
• There is increasing interest in using Cerenkov emissions for quality assurance and in vivo dosimetry in photon and electron therapy. Here, we investigate the production of Cerenkov light during proton therapy and its potential applications in proton therapy. A primary proton beam does not have suffi
• PMID 25365447

• Temporal summation of muscle pain evoked by very fast pressure sequences and rotation.

• Adnadjevic D1, Graven-Nielsen T.
• Somatosensory & motor research.Somatosens Mot Res.2014 Dec 2:1-7. [Epub ahead of print]
• Abstract Background: Pressure evoked temporal summation of pain has been described with slow repetitions (<0.5 Hz) relative to what is recommended originally for assessing temporal pain summation (>1 Hz). This study examined temporal summation of pain by repeated computer-controlled pressu
• PMID 25458323

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★リンクテーブル★

リンク元	「視覚」
関連記事	「sensation」「visual」

「視覚」

　　[★]

英

visual sensation, vision

ラ

risus

関

視神経

「sensation」

　　[★]

• n.

• (五感による)感覚、知覚。感情、気持ち、感じ(feeling)、～感。感覚/感情を引き起こすもの

Because the retained fluid is constantly leaking out of the intravascular compartment into the peritoneal cavity, the sensation of vascular filling is not achieved, and the process continues.(HIM.1978)

• (聴衆、公衆の)感動、興奮、大評判、大騒ぎ、センセーション。大評判のもの/人、世間をあっと言わせる大事件

　 　 　 　

「visual」

　　[★]

• adj.

• 視覚的な、視覚性の、視覚の、目視による

関

ocular、optic、vision、visually