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top 10 words in brain distribution (in article): water light animal form time type produce surface cause species |
top 10 words in brain distribution (in article): wear design century woman term world clothe type dress fashion |
top 10 words in brain distribution (not in article): drink ice lamp rock key wine lock state beer switch |
top 10 words in brain distribution (not in article): fuel engine horse gas energy city power oil hydrogen state |
times more probable under eye 30 20 10 6 4 2.5 1.25 1 1.25 2.5 4 6 10 20 30 times more probable under coat (words not in the model) | |
Eyes'" are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, mollusks, chordates, annelids and arthropods. The simplest "eyes", in even unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment. Overview. Complex eyes can distinguish shapes and colors. The visual fields of many organisms, especially predators, involve large areas of binocular vision to improve depth perception; in other organisms, eyes are located so as to maximise the field of view, such as in rabbits and horses. The first proto-eyes evolved among animals 540 million years ago, about the time of the so-called Cambrian explosion. The last common ancestor of animals possessed the biochemical toolkit necessary for vision, and more advanced eyes have evolved in 96% of animal species in 6 of the thirty-something main phyla. In most vertebrates and some mollusks, the eye works by allowing light to enter it and project onto a light-sensitive panel of cells, known as the retina, at the rear of the eye. The cone cells (for color) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision. The visual signals are then transmitted to the brain via the optic nerve. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris; the relaxing or tightening of the muscles around the iris change the size of the pupil, thereby regulating the amount of light that enters the eye, and reducing aberrations when there is enough light. The eyes of cephalopods, fish, amphibians and snakes usually have fixed lens shapes, and focusing vision is achieved by telescoping the lens — similar to how a camera focuses. Compound eyes are found among the arthropods and are composed of many simple facets which, depending on the details of anatomy, may give either a single pixelated image or multiple images, per eye. Each sensor has its own lens and photosensitive cell(s). Some eyes have up to 28,000 such sensors, which are arranged hexagonally, and which can give a full 360-degree field of vision. Compound eyes are very sensitive to motion. Some arthropods, including many Strepsiptera, have compound eyes of only a few facets, each with a retina capable of creating an image, creating vision. With each eye viewing a different thing, a fused image from all the eyes is produced in the brain, providing very different, high-resolution images. Possessing detailed hyperspectral color vision, the Mantis shrimp has been reported to have the world's most complex color vision system. Trilobites, which are now extinct, had unique compound eyes. They used clear calcite crystals to form the lenses of their eyes. In this, they differ from most other arthropods, which have soft eyes. The number of lenses in such an eye varied, however: some trilobites had only one, and some had thousands of lenses in one eye. In contrast to compound eyes, simple eyes are those that have a single lens. For example, jumping spiders have a large pair of simple eyes with a narrow field of view, supported by an array of other, smaller eyes for peripheral vision. Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. Some of the simplest eyes, called ocelli, can be found in animals like some of the snails, which cannot actually "see" in the normal sense. They do have photosensitive cells, but no lens and no other means of projecting an image onto these cells. They can distinguish between light and dark, but no more. This enables snails to keep | A coat'" is a long garment worn by both men and women, for warmth, protection or fashion. Coats typically have long sleeves and open down the front, closing by means of buttons, zippers, hook-and-loop fasteners, toggles, a belt, or a combination of these. Other possible ornaments include collars and shoulder straps. History of the word 'coat'. The Persians, based in what is now Iran, introduced two garments to the history of clothing: trousers and seamed fitted coats. "Coat" is one of the earliest clothing category words in English, attested as far back as the early Middle Ages. ("See also" Clothing terminology.) An early use of "coat" in English is coat of mail (chainmail), a tunic-like garment of metal rings, usually knee- or mid-calf length. The medieval and renaissance coat (generally spelled "cote" by costume historians) is a midlength, sleeved men's outer garment, fitted to the waist and buttoned up the front, with a full skirt: in its essentials, not unlike the modern coat. By the eighteenth century, overcoats had begun to supplant capes and cloaks as outer wear, and by the mid-twentieth century the terms "jacket" and "coat" became confused for recent styles; the difference in use is still maintained for older garments. Coats, Jackets and Overcoats. In the early nineteenth century, coats were divided into under-coats and overcoats. The term under-coat is now archaic but denoted the fact that the expression "coat" could be both the outermost layer for outdoor wear (overcoat) or the coat worn under that (under-coat). However, the term "coat" is increasingly beginning to denote just the overcoat rather than the under-coat. The older usage of the word "coat" can still be found in the expression "to wear a coat and tie", which does not mean that wearer has on an overcoat. Nor do the terms "tailcoat" or "morning coat" denote types of overcoat. Indeed, an overcoat may be worn over the top of a tailcoat. In tailoring circles, the tailor who makes all types of coats is called a "coat maker". Similarly, in both British and American English, the term "sports coat" is used to denote a type of jacket not worn as outerwear (overcoat). The term "jacket" is a traditional term usually used to refer to a specific type of short under-coat. Typical modern jackets extend only to the upper thigh in length, whereas older coats such as tailcoats are usually of knee length. The modern jacket worn with a suit is traditionally called a "lounge coat" (or a "lounge jacket") in British English and a "sack coat" in American English. The American English term is rarely used today. Traditionally, all men dressed in a "coat and tie", although this has become gradually less widespread since around the 1960s. Because the basic pattern for the stroller (black jacket worn with striped trousers in British English) and dinner jacket (tuxedo in American English) are the same as lounge coats, tailors traditionally call both of these special types of jackets a "coat". An overcoat is a long coat (at least mid-calf) designed to be worn as the outermost garment worn as outdoor wear; while this use is still maintained in some places, particularly in Britain, elsewhere the term "coat" is commonly used mainly denote only the overcoat, and not the under-coat. A "topcoat" is a slightly shorter overcoat, if any distinction is to be made. Overcoats worn over the top of knee length coats (under-coats) such as frock coats, dress coats, and morning coats are cut to be a little longer than the under-coat so as to completely cover it, as well as being large enough to accommodate the coat underneath. Coats of the 18th and 19th centuries. Some of these styles are still worn. Note that for this period, only coats of the under-coat variety are listed, and overcoats are excluded. Modern coats. The terms "coat" and "jacket" are used variously around the world, and we treat modern clothes as jackets. References. General: Picken, Mary Brooks: "The Fashion Dictionary", Funk and Wagnalls, 1957. (1973 edition ISBN 0-308-10052-2) |