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69-542: N400 or N-400 may refer to: N400 (neuroscience) , an event-related potential component elicited by meaningful stimuli (words, pictures, etc.) N-400 road (Spain) , a highway connecting Toledo to Cuenca Honda N400 , a car similar to the Honda N360 Samsung N400, a mobile phone by Samsung Form N-400 , United States Citizenship and Immigration Services application for naturalization A variant of

138-467: A 4:3 aspect ratio and some had 5:4 . Between 2003 and 2006, monitors with 16:9 and mostly 16:10 (8:5) aspect ratios became commonly available, first in laptops and later also in standalone monitors. Reasons for this transition included productive uses (i.e. field of view in video games and movie viewing) such as the word processor display of two standard letter pages side by side, as well as CAD displays of large-size drawings and application menus at

207-412: A DTA box may be needed to use a computer monitor as a TV set. Early electronic computer front panels were fitted with an array of light bulbs where the state of each particular bulb would indicate the on/off state of a particular register bit inside the computer. This allowed the engineers operating the computer to monitor the internal state of the machine, so this panel of lights came to be known as

276-408: A color triangle . Some of these triangles are smaller than the sRGB triangle, some are larger. Colors are typically encoded by 8 bits per primary color. The RGB value [255, 0, 0] represents red, but slightly different colors in different color spaces such as Adobe RGB and sRGB. Displaying sRGB-encoded data on wide-gamut devices can give an unrealistic result. The gamut is a property of the monitor;

345-510: A picture , video or working space, without obstruction from the bezel or other aspects of the unit's design. The main measurements for display devices are width, height, total area and the diagonal. The size of a display is usually given by manufacturers diagonally, i.e. as the distance between two opposite screen corners. This method of measurement is inherited from the method used for the first generation of CRT television when picture tubes with circular faces were in common use. Being circular, it

414-535: A P300 instead of negativity in the N400 window. This finding showed that the N400 is related to semantic processing, and is not just a response to unexpected words. The N400 is characterized by a distinct pattern of electrical activity that can be observed at the scalp. As its name indicates, this waveform peaks around 400 ms post-stimulus onset, with negativity that can be observed in the time window ranging from 250-500 ms. This latency (delay between stimulus and response)

483-482: A P300 to the unexpected sentence-final words. However, instead of eliciting a large positivity, these anomalous endings elicited a large negativity, relative to the sentences with expected endings (i.e. He returned the book to the library ) In the same paper, they confirmed that the negativity was not just caused by any unexpected event at the end of a sentence, since a semantically expected but physically unexpected word (i.e. She put on her high-heeled SHOES ) elicited

552-417: A complete account of just what the N400 represents. Computer monitor A computer monitor is an output device that displays information in pictorial or textual form. A discrete monitor comprises a visual display , support electronics, power supply, housing , electrical connectors , and external user controls. The display in modern monitors is typically an LCD with LED backlight , having by

621-452: A large N400 response. Rather, these types of violations show a large positivity from about 500-1000 ms after stimulus onset, known as the P600 . A striking feature of the N400 is the general invariance of its peak latency. Although many different experimental manipulations affect the amplitude of the N400, few factors (aging and disease states and language proficiency being rare examples) alter

690-449: A monitor with a graphics tablet . Such devices are typically unresponsive to touch without the use of one or more special tools' pressure. Newer models however are now able to detect touch from any pressure and often have the ability to detect tool tilt and rotation as well. Touch and tablet sensors are often used on sample and hold displays such as LCDs to substitute for the light pen , which can only work on CRTs. The option for using

759-420: A sentence context, an important determinant of N400 amplitude elicited by a word is its cloze probability. Cloze probability is defined as the probability of the target word completing that particular sentence frame. Kutas and Hillyard (1984) found that a word's N400 amplitude has a nearly inverse linear relationship with its cloze probability. That is, as a word becomes less expected in context, its N400 amplitude

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828-427: A single number specifying the size and was not confusing when the aspect ratio was universally 4:3. With the introduction of flat-panel technology, the diagonal measurement became the actual diagonal of the visible display. This meant that an eighteen-inch LCD had a larger viewable area than an eighteen-inch cathode-ray tube. Estimation of monitor size by the distance between opposite corners does not take into account

897-413: A time period on standby. Most modern laptops provide a method of screen dimming after periods of inactivity or when the battery is in use. This extends battery life and reduces wear. Most modern monitors have two different indicator light colors wherein if video-input signal was detected, the indicator light is green and when the monitor is in power-saving mode, the screen is black and the indicator light

966-423: A variety of methods for mounting them depending on the application and environment. A desktop monitor is typically provided with a stand from the manufacturer which lifts the monitor up to a more ergonomic viewing height. The stand may be attached to the monitor using a proprietary method or may use, or be adaptable to, a VESA mount. A VESA standard mount allows the monitor to be used with more after-market stands if

1035-436: A wide range of paradigms can be used to study it. Experiments involving the presentation of spoken words, acronyms, pictures embedded at the end of sentences, music, words related to current context or orientation and videos of real-word events, have all been used to study the N400, just to name a few. Extensive research has been carried out to better understand what kinds of experimental manipulations do and do not affect

1104-678: A word is highly frequent or has recently appeared in context, it eases the semantic processing thought to be indexed by the N400, reducing its amplitude. N400 amplitude is also sensitive to a word's orthographic neighborhood size, or how many other words differ from it by only one letter (e.g. boot and boat ). Words with large neighborhoods (that have many other physically similar items) elicit larger N400 amplitudes than do words with small neighborhoods. This finding also holds true for pseudowords, or pronounceable letter strings that are not real words (e.g. flom), which are not themselves meaningful but look like words. This has been taken as evidence that

1173-414: Is 1920 × 1080 , shared with the 1080p of HDTV. Before 2013 mass market LCD monitors were limited to 2560 × 1600 at 30 in (76 cm), excluding niche professional monitors. By 2015 most major display manufacturers had released 3840 × 2160 ( 4K UHD ) displays, and the first 7680 × 4320 ( 8K ) monitors had begun shipping. Every RGB monitor has its own color gamut , bounded in chromaticity by

1242-635: Is a variant of LCD which is now the dominant technology used for computer monitors. The first standalone LCDs appeared in the mid-1990s selling for high prices. As prices declined they became more popular, and by 1997 were competing with CRT monitors. Among the first desktop LCD computer monitors were the Eizo FlexScan L66 in the mid-1990s, the SGI 1600SW , Apple Studio Display and the ViewSonic VP140 in 1998. In 2003, LCDs outsold CRTs for

1311-549: Is different from Wikidata All article disambiguation pages All disambiguation pages N400 (neuroscience) The N400 was first discovered by Marta Kutas and Steven Hillyard in 1980. They conducted the first experiment looking at the response to unexpected words in read sentences , expecting to elicit a P300 component. The P300 had previously been shown to be elicited by unexpected stimuli. Kutas and Hillyard therefore used sentences with anomalous endings (i.e. I take coffee with cream and dog ), expecting to see

1380-425: Is elicited in the N400 time window, suggesting a highly distributed neural source. There is still much debate as to exactly what kind of neural and comprehension processes the N400 indexes. Some researchers believe that the underlying processes reflected in the N400 occur after a stimulus has been recognized. For example, Brown and Hagoort (1993) believe that the N400 occurs late in the processing stream, and reflects

1449-617: Is imparted, reducing geometric distortion, especially in extremely large and wide seamless desktop monitors intended for close viewing range. Newer monitors are able to display a different image for each eye , often with the help of special glasses and polarizers, giving the perception of depth. An autostereoscopic screen can generate 3D images without headgear. Features for medical using or for outdoor placement. Narrow viewing angle screens are used in some security-conscious applications. Integrated screen calibration tools, screen hoods, signal transmitters; Protective screens. A combination of

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1518-503: Is implemented on most modern flat-panel monitors and TVs. For computer monitors, the VESA Mount typically consists of four threaded holes on the rear of the display that will mate with an adapter bracket. Rack mount computer monitors are available in two styles and are intended to be mounted into a 19-inch rack: A fixed rack mount monitor is mounted directly to the rack with the flat-panel or CRT visible at all times. The height of

1587-436: Is increased relative to more expected words. Words that are incongruent with a context (and thus have a cloze probability of 0) elicit large N400 amplitudes as well (although the amplitude of the N400 for incongruent words is also modulated by the cloze probability of the congruent word that would have been expected in its place Relatedly, the N400 amplitude elicited by open-class words (i.e. nouns, verbs, adjectives, and adverbs)

1656-480: Is needed both in electronic publishing (via the Internet for display in browsers) and in desktop publishing targeted to print. Most modern monitors will switch to a power-saving mode if no video-input signal is received. This allows modern operating systems to turn off a monitor after a specified period of inactivity. This also extends the monitor's service life. Some monitors will also switch themselves off after

1725-539: Is not a building and A sparrow is not a bird ), the N400 amplitude to building will still be more negative than that seen to bird . This suggests that the N400 responds to the relationship between words in context, but is not necessarily sensitive to the sentence's truth value . More recent research, however, has demonstrated that the N400 can sometimes be modulated by quantifiers or adjectives that serve negation-like purposes, or by pragmatically licensed negation. Additionally, grammatical violations do not elicit

1794-643: Is orange. Some monitors have different indicator light colors and some monitors have a blinking indicator light when in power-saving mode. Many monitors have other accessories (or connections for them) integrated. This places standard ports within easy reach and eliminates the need for another separate hub , camera , microphone , or set of speakers . These monitors have advanced microprocessors which contain codec information, Windows interface drivers and other small software which help in proper functioning of these functions. Monitors that feature an aspect ratio greater than 2:1 (for instance, 21:9 or 32:9, as opposed to

1863-419: Is reduced for words appearing later in a sentence compared to earlier words. Taken together, these findings suggest that when the prior context builds up meaning, it makes the processing of upcoming words that fit with that context easier, reducing the N400 amplitude they elicit. While the N400 is larger to unexpected items at the end of a sentence, its amplitude is generally unaffected by negation that causes

1932-469: Is that the N400 reflects prediction error or surprisal. Word-based surprisal was a strong predictor of N400 amplitude in an ERP corpus. In addition, connectionist models make use of prediction error for learning and linguistic adaptation, and these models can explain several N400/P600 results in terms of prediction error propagation for learning. It may also be that the N400 reflects a combination of these or other factors. Nieuwland et al. (2019) argue that

2001-409: Is very stable across tasks—little else besides age affects the timing of its peak. The N400 is a negative component, relative to reference electrodes placed on the mastoid processes (the bony ridge behind the ear), and relative to a 100 ms pre-stimulus baseline. Its amplitude can range from -5 to 5 microvolts . However, it is important to note that in studies using the N400 as a dependent measure,

2070-597: The Aston Martin V8 Vantage car [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=N400&oldid=575933070 " Category : Letter–number combination disambiguation pages Hidden categories: Short description

2139-558: The Enhanced Graphics Adapter which was capable of producing 16 colors and had a resolution of 640 × 350 . By the end of the 1980s color progressive scan CRT monitors were widely available and increasingly affordable, while the sharpest prosumer monitors could clearly display high-definition video , against the backdrop of efforts at HDTV standardization from the 1970s to the 1980s failing continuously, leaving consumer SDTVs to stagnate increasingly far behind

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2208-472: The display aspect ratio , so that for example a 16:9 21-inch (53 cm) widescreen display has less area, than a 21-inch (53 cm) 4:3 screen. The 4:3 screen has dimensions of 16.8 in × 12.6 in (43 cm × 32 cm) and an area 211 sq in (1,360 cm ), while the widescreen is 18.3 in × 10.3 in (46 cm × 26 cm), 188 sq in (1,210 cm ). Until about 2003, most computer monitors had

2277-517: The 'monitor'. As early monitors were only capable of displaying a very limited amount of information and were very transient, they were rarely considered for program output. Instead, a line printer was the primary output device, while the monitor was limited to keeping track of the program's operation. Computer monitors were formerly known as visual display units ( VDU ), particularly in British English. This term mostly fell out of use by

2346-512: The 1980s onward, computers (and their monitors) have been used for both data processing and video, while televisions have implemented some computer functionality. In the 2000s, the typical display aspect ratio of both televisions and computer monitors changed from 4:3 to 16:9. Modern computer monitors are often functionally interchangeable with television sets and vice versa. As most computer monitors do not include integrated speakers , TV tuners , or remote controls, external components such as

2415-431: The 1990s. Multiple technologies have been used for computer monitors. Until the 21st century most used cathode-ray tubes but they have largely been superseded by LCD monitors . The first computer monitors used cathode-ray tubes (CRTs). Prior to the advent of home computers in the late 1970s, it was common for a video display terminal (VDT) using a CRT to be physically integrated with a keyboard and other components of

2484-474: The 2010s replaced CCFL backlit LCDs. Before the mid-2000s, most monitors used a cathode-ray tube (CRT) as the image output technology. A monitor is typically connected to its host computer via DisplayPort , HDMI , USB-C , DVI , or VGA . Monitors sometimes use other proprietary connectors and signals to connect to a computer, which is less common. Originally computer monitors were used for data processing while television sets were used for video. From

2553-421: The N400 is a priming paradigm. Subjects are shown a list of words in which a prime word is either associatively related to a target word (e.g. bee and honey), semantically related (e.g. sugar and honey) or a direct repetition (e.g. honey and honey). The N400 amplitude seen to the target word (honey) will be reduced upon repetition due to semantic priming. The amount of reduction in amplitude can be used to measure

2622-493: The N400 is actually made up of two sub-components, with predictability affecting the early part of the N400 (200-500 ms after stimulus onset) and plausibility affecting it later (350-650 ms after stimulus onset). This suggests that the N400 reflects both access to semantic memory (which is sensitive to prediction), and semantic integration (sensitive to plausibility). As research in the field of electrophysiology continues to progress, these theories will likely be refined to include

2691-455: The N400 reflects general activation in the comprehension network, such that an item that looks like many words (regardless of whether it itself is a word) partially activates the representations of similar-looking words, producing a more negative N400. The N400 is sensitive to priming : in other words, its amplitude is reduced when a target word is preceded by a word that is semantically, morphologically, or orthographically related to it. In

2760-494: The N400 represents a broader range of processes indexing access to semantic memory . According to this account, it represents the binding of information obtained from stimulus input with representations from short- and long-term memory (such as recent context, and accessing a word's meaning in long term memory) that work together to create meaning from the information available in the current context (Federmeier & Laszlo, 2009; see Kutas & Federmeier, 2011 ). Another account

2829-435: The N400. General findings are discussed below. The frequency of a word's usage is known to affect the amplitude of the N400. With all else being constant, highly frequent words elicit reduced N400s relative to infrequent words. As previously mentioned, N400 amplitude is also reduced by repetition, such that a word's second presentation exhibits a more positive response when repeated in context. These findings suggest that when

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2898-420: The benefits of both LCD and CRT monitors with few of their drawbacks, though much like plasma panels or very early CRTs they suffer from burn-in , and remain very expensive. The performance of a monitor is measured by the following parameters: On two-dimensional display devices such as computer monitors the display size or viewable image size is the actual amount of screen space that is available to display

2967-547: The best LCD monitors having achieved moderate temporal accuracy, and so can be used only if their poor spatial accuracy is unimportant. High dynamic range (HDR) has been implemented into high-end LCD monitors to improve grayscale accuracy. Since around the late 2000s, widescreen LCD monitors have become popular, in part due to television series, motion pictures and video games transitioning to widescreen, which makes squarer monitors unsuited to display them correctly. Organic light-emitting diode (OLED) monitors provide most of

3036-413: The brain, evidence from brain damaged patients, and magnetoencephalographic (MEG) recordings (which measure magnetic activity at the scalp associated with the electrical signal measured by ERPs), the left temporal lobe has been highlighted as an important source for the N400, with additional contributions from the right temporal lobe . More generally, however, activity in a wide network of brain areas

3105-456: The capabilities of computer CRT monitors well into the 2000s. During the following decade, maximum display resolutions gradually increased and prices continued to fall as CRT technology remained dominant in the PC monitor market into the new millennium, partly because it remained cheaper to produce. CRTs still offer color, grayscale, motion, and latency advantages over today's LCDs, but improvements to

3174-423: The degree of relatedness between the words. Another widely used experimental task used to study the N400 is sentence reading . In this kind of study, sentences are presented to subjects centrally, one word at a time, until the sentence is completed. Alternatively, subjects could listen to a sentence as natural auditory speech. Again, subjects may be asked to respond to comprehension questions periodically throughout

3243-425: The display as a reference monitor; these calibration features can give an advanced color management control for take a near-perfect image. Option for professional LCD monitors, inherent to OLED & CRT; professional feature with mainstream tendency. Near to mainstream professional feature; advanced hardware driver for backlit modules with local zones of uniformity correction. Computer monitors are provided with

3312-513: The distribution can change slightly depending on the eliciting stimulus. A typical experiment designed to study the N400 will usually involve the visual presentation of words, either in sentence or list contexts. In a typical visual N400 experiment, for example, subjects will be seated in front of a computer monitor while words are presented one-by-one at a central screen location. Stimuli must be presented centrally because eye movements will generate large amounts of electrical noise that will mask

3381-452: The experiment, although this is not necessary. Experimenters can choose to manipulate various linguistic characteristics of the sentences, including contextual constraint or the cloze probability of the sentence-final word (see below for a definition of cloze probability) to observe how these changes affect the waveform's amplitude. As previously mentioned, the N400 response is seen to all meaningful, or potentially meaningful, stimuli. As such,

3450-721: The first time, becoming the primary technology used for computer monitors. The physical advantages of LCD over CRT monitors are that LCDs are lighter, smaller, and consume less power. In terms of performance, LCDs produce less or no flicker, reducing eyestrain, sharper image at native resolution, and better checkerboard contrast. On the other hand, CRT monitors have superior blacks, viewing angles, and response time, can use arbitrary lower resolutions without aliasing, and flicker can be reduced with higher refresh rates, though this flicker can also be used to reduce motion blur compared to less flickery displays such as most LCDs. Many specialized fields such as vision science remain dependent on CRTs,

3519-470: The image color space can be forwarded as Exif metadata in the picture. As long as the monitor gamut is wider than the color space gamut, correct display is possible, if the monitor is calibrated. A picture that uses colors that are outside the sRGB color space will display on an sRGB color space monitor with limitations. Still today, many monitors that can display the sRGB color space are not factory nor user-calibrated to display it correctly. Color management

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3588-474: The integration of a word's meaning into the preceding context (see Kutas & Federmeier, 2011, for a discussion). However, this account has not explained why items that themselves have no meaning (e.g. pseudowords without defined associations) also elicit the N400. Other researchers believe that the N400 occurs much earlier, before words are recognized, and represents neurolinguistics , orthographic or phonological analysis. More recent accounts posit that

3657-419: The last word to be untrue and thus anomalous. For example, in the sentence A sparrow is a building , the N400 response to building is more negative than the N400 response to bird in the sentence A sparrow is a bird . In this case, building has a lower cloze probability, and so it is less expected than bird . However, if negation is added to both sentences in the form of the word not (i.e. A sparrow

3726-453: The latter have made them much less obvious. The dynamic range of early LCD panels was very poor, and although text and other motionless graphics were sharper than on a CRT, an LCD characteristic known as pixel lag caused moving graphics to appear noticeably smeared and blurry. There are multiple technologies that have been used to implement liquid-crystal displays (LCD). Throughout the 1990s, the primary use of LCD technology as computer monitors

3795-541: The more common 16:9, which resolves to 1.7 7 :1).Monitors with an aspect ratio greater than 3:1 are marketed as super ultrawide monitors. These are typically massive curved screens intended to replace a multi-monitor deployment. These monitors use touching of the screen as an input method. Items can be selected or moved with a finger, and finger gestures may be used to convey commands. The screen will need frequent cleaning due to image degradation from fingerprints. Some displays, especially newer flat-panel monitors, replace

3864-564: The more graphically sophisticated Atari 8-bit computers , introduced in 1979. Either computer could be connected to the antenna terminals of an ordinary color TV set or used with a purpose-made CRT color monitor for optimum resolution and color quality. Lagging several years behind, in 1981 IBM introduced the Color Graphics Adapter , which could display four colors with a resolution of 320 × 200 pixels, or it could produce 640 × 200 pixels with two colors. In 1984 IBM introduced

3933-547: The original stand is removed. Stands may be fixed or offer a variety of features such as height adjustment, horizontal swivel, and landscape or portrait screen orientation. The Flat Display Mounting Interface (FDMI), also known as VESA Mounting Interface Standard (MIS) or colloquially as a VESA mount, is a family of standards defined by the Video Electronics Standards Association for mounting flat-panel displays to stands or wall mounts. It

4002-442: The rack. There are smaller display units, typically used in broadcast environments, which fit multiple smaller screens side by side into one rack mount. A stowable rack mount monitor is 1U, 2U or 3U high and is mounted on rack slides allowing the display to be folded down and the unit slid into the rack for storage as a drawer . The flat display is visible only when pulled out of the rack and deployed. These units may include only

4071-416: The relative amplitude of the waveform compared to another experimental condition (the "N400 effect") is more important than its absolute amplitude. The N400 itself is not always negative—it is just a more negative-going deflection than that seen to other conditions. Its distribution is maximal over centro-parietal electrode sites, and is slightly larger over the left side of the head for visual words, although

4140-541: The relatively small N400 component. Subjects will often be given a behavioral task (e.g., making a word/nonword decision, answering a comprehension question, responding to a memory probe), either after each stimulus or at longer intervals, to ensure that subjects are paying attention. Note, however, that overt responses by the subject are not required to elicit the N400—passively viewing stimuli will still evoke this response. An example of an experimental task used to study

4209-463: The release of a slow, but affordable Tektronix 4010 terminal in 1972. Some of the earliest home computers (such as the TRS-80 and Commodore PET ) were limited to monochrome CRT displays, but color display capability was already a possible feature for a few MOS 6500 series -based machines (such as introduced in 1977 Apple II computer or Atari 2600 console), and the color output was a specialty of

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4278-528: The same time. In 2008 16:10 became the most common sold aspect ratio for LCD monitors and the same year 16:10 was the mainstream standard for laptops and notebook computers . In 2010, the computer industry started to move over from 16:10 to 16:9 because 16:9 was chosen to be the standard high-definition television display size, and because they were cheaper to manufacture. In 2011, non-widescreen displays with 4:3 aspect ratios were only being manufactured in small quantities. According to Samsung , this

4347-409: The time it takes for the N400 component to reach a peak amplitude. Although localization of the neural generators of an ERP signal is difficult due to the spreading of current from the source to the sensors, multiple techniques can be used to provide converging evidence about possible neural sources. Using methods such as recordings directly off the surface of the brain or from electrodes implanted in

4416-405: The traditional anti-glare matte finish with a glossy one. This increases color saturation and sharpness but reflections from lights and windows are more visible. Anti-reflective coatings are sometimes applied to help reduce reflections, although this only partly mitigates the problem. Most often using nominally flat-panel display technology such as LCD or OLED, a concave rather than convex curve

4485-436: The unit is measured in rack units (RU) and 8U or 9U are most common to fit 17-inch or 19-inch screens. The front sides of the unit are provided with flanges to mount to the rack, providing appropriately spaced holes or slots for the rack mounting screws. A 19-inch diagonal screen is the largest size that will fit within the rails of a 19-inch rack. Larger flat-panels may be accommodated but are 'mount-on-rack' and extend forward of

4554-569: The workstation in a single large chassis , typically limiting them to emulation of a paper teletypewriter , thus the early epithet of 'glass TTY'. The display was monochromatic and far less sharp and detailed than on a modern monitor, necessitating the use of relatively large text and severely limiting the amount of information that could be displayed at one time. High-resolution CRT displays were developed for specialized military, industrial and scientific applications but they were far too costly for general use; wider commercial use became possible after

4623-440: Was because the "Demand for the old 'Square monitors' has decreased rapidly over the last couple of years," and "I predict that by the end of 2011, production on all 4:3 or similar panels will be halted due to a lack of demand." The resolution for computer monitors has increased over time. From 280 × 192 during the late 1970s, to 1024 × 768 during the late 1990s. Since 2009, the most commonly sold resolution for computer monitors

4692-475: Was in laptops where the lower power consumption, lighter weight, and smaller physical size of LCDs justified the higher price versus a CRT. Commonly, the same laptop would be offered with an assortment of display options at increasing price points: (active or passive) monochrome, passive color, or active matrix color (TFT). As volume and manufacturing capability have improved, the monochrome and passive color technologies were dropped from most product lines. TFT-LCD

4761-399: Was the external diameter of the glass envelope that described their size. Since these circular tubes were used to display rectangular images, the diagonal measurement of the rectangular image was smaller than the diameter of the tube's face (due to the thickness of the glass). This method continued even when cathode-ray tubes were manufactured as rounded rectangles; it had the advantage of being

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