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Sound Of Fingernails Scraping Chalkboard
Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its physiological effects). Physiological response Brain stem reflex In response to audio stimuli, the mind's way of interpreting sound can be translated through a regulatory process called the reticular activating system. Located in the brain stem, the reticular activating system continually listens, even throughout delta-wave sleep, to determine the importance of sounds in relation to waking the cortex or the rest of the body from sleep. Chalkboard scraping, or noises that elicit an emotional response have been known to trigger tendencies from the fight or flight response which acts as the body's primary self-defense mechanism. Emotional response Distinct emotion A stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalkboard
A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. Design A blackboard can simply be a board painted with a dark matte paint (usually black, occasionally dark green). Matte black plastic sign material (known as closed-cell PVC foamboard) is also used to create custom chalkboard art. Blackboards on an A-frame are used by restaurants and bars to advertise daily specials. A more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade blackboards are made of a rougher version porcelain enamelled steel (black, green, blue or sometimes other colours). Porcelain is very hard wearing, and blackboar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garden Fork
A garden fork, spading fork, or digging fork is a gardening implement, with a handle and a square-shouldered head featuring several (usually four) short, sturdy tines. It is used for loosening, lifting and turning over soil in gardening and farming, and not to be confused with the pitchfork, a similar tined tool used for moving (or throwing) loose materials such as hay, straw, silage, and manure. A garden fork is used similarly to a spade in loosening and turning over soil. Its tines allow it to be pushed more easily into the ground, and it can rake out stones and weeds and break up clods, it is not so easily stopped by stones, and it does not cut through weed roots or root-crops. Garden forks were originally made of wood, but the majority are now made of forged carbon steel or stainless steel. Reflecting their differing uses, garden forks have shorter, flatter, thicker, and more closely spaced tines than pitchforks. They have comparatively a fairly short, stout, usually wood ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalkboard Paint
Chalkboard paint is a specialized paint that creates a chalkboard like coating that can be utilized as a writing surface in the same manner as a traditional chalkboard or blackboard. Chalkboard paint is commonly made out of a mixture of talc, acrylic, water, glycol, titanium dioxide, carbon black, opacifiers, silica, and esters. It may also contain acetone, propane, butane, xylene, ethylbenzene, amorphous silica, n-butyl acetate, and propylene glycol methyl ether acetate which are industrial standard ingredients used in inks and paints as thinners, olfactory, and pigment A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compo ...ation agents. References {{reflist Paints Writing media ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equal-loudness Contour
An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing frequencies are said to have equal-loudness level measured in phons if they are perceived as equally loud by the average young person without significant hearing impairment. The Fletcher–Munson curves are one of many sets of equal-loudness contours for the human ear, determined experimentally by Harvey Fletcher and Wilden A. Munson, and reported in a 1933 paper entitled "Loudness, its definition, measurement and calculation" in the ''Journal of the Acoustical Society of America''. Fletcher–Munson curves have been superseded and incorporated into newer standards. The definitive curves are those defined in ISO 226 from the International Orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ear Canal
The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear. The adult human ear canal extends from the pinna to the eardrum and is about in length and in diameter. Structure The human ear canal is divided into two parts. The elastic cartilage part forms the outer third of the canal; its anterior and lower wall are cartilaginous, whereas its superior and back wall are fibrous. The cartilage is the continuation of the cartilage framework of pinna. The cartilaginous portion of the ear canal contains small hairs and specialized sweat glands, called apocrine glands, which produce cerumen ( ear wax). The bony part forms the inner two thirds. The bony part is much shorter in children and is only a ring (''annulus tympanicus'') in the newborn. The layer of epithelium encompassing the bony portion of the ear canal is much thinner and therefore, more sensitive in comparison to the cartilaginous portion. Size and sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustic Resonance
Acoustic resonance is a phenomenon in which an acoustic system amplifies sound waves whose frequency matches one of its own natural frequencies of vibration (its ''resonance frequencies''). The term "acoustic resonance" is sometimes used to narrow mechanical resonance to the frequency range of human hearing, but since acoustics is defined in general terms concerning vibrational waves in matter, acoustic resonance can occur at frequencies outside the range of human hearing. An acoustically resonant object usually has more than one resonance frequency, especially at harmonics of the strongest resonance. It will easily vibrate at those frequencies, and vibrate less strongly at other frequencies. It will "pick out" its resonance frequency from a complex excitation, such as an impulse or a wideband noise excitation. In effect, it is filtering out all frequencies other than its resonance. Acoustic resonance is an important consideration for instrument builders, as most acoustic i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of The Acoustical Society Of America
The ''Journal of the Acoustical Society of America'' is a monthly peer-reviewed scientific journal covering all aspects of acoustics. It is published by the Acoustical Society of America and the editor-in-chief is James F. Lynch (Woods Hole Oceanographic Institution The Woods Hole Oceanographic Institution (WHOI, acronym pronounced ) is a private, nonprofit research and higher education facility dedicated to the study of marine science and engineering. Established in 1930 in Woods Hole, Massachusetts, it i ...). References External links * Acoustical Society of America Acoustics journals Publications established in 1929 Monthly journals English-language journals {{acoustics-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christoph Reuter
Christoph Reuter (born 28 November 1968) is a German University professor for systematic musicology at the University of Vienna. life Born in Duisburg, Reuter studied musicology at the University of Cologne, received his doctorate ''summa cum laude'' in 1996 and his habilitation in 2002. He has held guest professorships or teaching positions at several universities (University of Vienna, Hochschule für Musik Franz Liszt, Weimar), and has also been a managing partner of a Cologne-based internet agency since 2000. Since 2008, Reuter has been university professor for systematic musicology at the University of Vienna. Scientific activity His research interests include musical acoustics, music physiology and psychological aspects of music perception as well as music-related internet/software projects. Examples of his manifold studies in the field of systematic musicology are investigations on ''sound colour perception'', on the ''Variophon'', on ''music automatons'', on ''percept ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Musicology
Musicology (from Greek μουσική ''mousikē'' 'music' and -λογια ''-logia'', 'domain of study') is the scholarly analysis and research-based study of music. Musicology departments traditionally belong to the humanities, although some music research is scientific in focus (psychological, sociological, acoustical, neurological, computational). Some geographers and anthropologists have an interest in musicology so the social sciences also have an academic interest. A scholar who participates in musical research is a musicologist. Musicology traditionally is divided in three main branches: historical musicology, systematic musicology and ethnomusicology. Historical musicologists mostly study the history of the western classical music tradition, though the study of music history need not be limited to that. Ethnomusicologists draw from anthropology (particularly field research) to understand how and why people make music. Systematic musicology includes music theory, aesthe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Applied Acoustics
''Applied Acoustics'' (French: ''Acoustique Appliquée'', German: ''Angewandte Akustik'') is a bimonthly peer-reviewed scientific journal. It was established in 1968 Elsevier, who continues to publish the journal bimonthly. This journal covers research and applications in all aspects of acoustics. The editor in chief is Shiu Keung Tang and Kai Ming Li. According to the ''Journal Citation Reports'', the journal has a 2021 impact factor of 3.614. Abstracting and indexing This journal is indexed by the following services: *Science Citation Index *Current Contents/ Engineering, Computing & Technology * Academic Onefile *Applied Mechanics Reviews *CSA (database company) *Ei Compendex *EBSCO Information Services *GeoRef * INSPEC *Scopus Scopus is Elsevier's abstract and citation database launched in 2004. Scopus covers nearly 36,377 titles (22,794 active titles and 13,583 inactive titles) from approximately 11,678 publishers, of which 34,346 are peer-reviewed journals in top-l ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ig Nobel Prize
The Ig Nobel Prize ( ) is a satiric prize awarded annually since 1991 to celebrate ten unusual or trivial achievements in scientific research. Its aim is to "honor achievements that first make people laugh, and then make them think." The name of the award is a pun on the Nobel Prize, which it parodies, and on the word '' ignoble'' ("not noble"). Organized by the scientific humor magazine, '' Annals of Improbable Research'' (AIR), the Ig Nobel Prizes are presented by Nobel laureates in a ceremony at the Sanders Theater, Harvard University, and are followed by the winners' public lectures at the Massachusetts Institute of Technology. History The Ig Nobels were created in 1991 by Marc Abrahams, editor and co-founder of the '' Annals of Improbable Research'', a former editor-in-chief of the ''Journal of Irreproducible Results'' who has been master of ceremonies at all awards ceremonies. Awards were presented at that time for discoveries "that cannot, or should not, be reproduced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perception & Psychophysics
The Psychonomic Society is an international scientific society of over 4,500 scientists in the field of experimental psychology. The mission of the Psychonomic Society is to foster the science of cognition through the advancement and communication of basic research in experimental psychology and allied sciences. It is open to international researchers, and almost 40% of members are based outside of North America. Although open to all areas of experimental and cognitive psychology, its members typically study areas such as learning, memory, attention, motivation, perception, categorization, decision making, and psycholinguistics. Its name is taken from the word psychonomics, meaning "the science of the laws of the mind". History The Psychonomic Society was founded by a group of experimental psychologists during a meeting in Chicago, Illinois, USA in December 1959. The main goal was to create a society that would support open communication about psychological science with minimal s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
