Explain, in detail, the process of hearing in humans.

Explain, in detail, the process of hearing in humans. Explain, in detail, the process of hearing in humans. What factors can affect our hearing in terms of perception of loudness, pitch and direction? What part does psychoacoustics play in our perception of sound. Introduction The ear can be divided into three sections each performing a specific role to change sound particles into messages the brain can read. The three major parts of the ear are the outer, middle and inner ear. Simplistically it is somewhat like a mechanical process that changes an analogue signal into a digital message that your brain can understand. However, there are certain factors that can affect our hearing in terms of perception of loudness, pitch and direction. Psychoacoustics needs to be considered when looking at the process of hearing as it examines the relationship between sound and the effect it has upon the brain. Physical Description of the Ear The process of hearing utilises all three sections of the ear. The first section, the outer ear consists of the pinna, the auditory canal and the wax. The pinna is the main part of the ear that you can see, its role, to collect sound and direct it down the auditory canal towards the ear drum. The outside of your ear is perfectly designed to collect sound. This design helps to determine the sounds direction. Sounds waves bounce off the Pinna depending on from which direction they came from. The sound reflection from the Pinna alters the pattern of the sound wave which the brain is able to distinguish and determine where the sound came from. The auditory canal is the main pathway of sound, its role is to direct sound towards the eardrum, the canal is also where earwax is produced. The purpose of ear wax is to keep the ear canal clean by collecting dirt and debris. Once the sound wave has passed through the outer ear and has been directed down the auditory canal to the middle ear it hits the Tympanic Membrane (Ear Drum), this is a very tight thin piece of tissue which converts the sound wave into vibrations. The ear drum separates the outer ear with the ossicles, these are the three main bones in your ear. When the ear drum vibrates this causes the bones to move, the vibrations set the bones into motion passing the signal from one bone to the other. These tiny bones are called the Malleus (Hammer) directly connected to the ear drum, the Incus (Anvil) which is attached to the Malleus and finally the Stapes (Stirrup) which is attached to the Incus and is the smallest bone in the human body. The stapes is attached to the oval window, a membrane which is part of the cochlea and separates the middle ear from the inner ear. The inner ear is the most complex and detailed part, containing the main sensory organ called the cochlea. Its role is to convert the vibrations absorbed through the ossicles and passed through the oval window membrane into electrical impulses. The cochleas shape is a small spiralled tube resembling a snail shell, this is filled with fluid and miniscule hairs. The vibrations from the stirrup cause the oval window membrane to flex which in turn sets the fluid into motion, the moving fluid brushes across thousands of microscopic hair cells called cilia, These are tuned in to certain frequencies, higher frequencies by cillia located near to the oval window membrane and lower frequencies by cillia located at the apex of the cochlea. This allows it to act as a frequency spectrum analyser. The cillia convert the vibrations into electric nerve impulses sent to the brain by the auditory nerve which is then interpreted as sound. Psychoacoustic Phenomenon Psychoacoustics also needs to be considered when looking at the process of hearing as it examines the relationship between sound and the effect it has upon the brain. The Doppler Effect is an example of this. It â€Å"is the change in frequency of awave for an observer moving relative to the source of the wave.† For example, a car emitting a constant horn sound starts to approach you at speed as you are stood at the side of the road. As the car approaches you, the sound of the horn starts to get louder and higher in pitch. Once the car has passed you the sound of the horn starts to lower in pitch and decrease in volume. As the vehicle passes, sound waves from the horn are crowded together in front of the car, the crowded sound waves produce the relatively high pitch sound, as the car passes the sound waves are more spread out resulting in the relatively low pitch sound, as you can see on the diagram below The second phenomenon that can affect our perception is the Haas effect. If two sounds of equal frequency content and intensity are played from different directions, we will only hear the first one to arrive, and we will perceive only one sound coming from that direction. An example of this used in public address systems so that multiple speakers do not affect the perceived direction of the sound coming from the stage. Second part (also 750 words): Giving at least 2 significantly different examples, discuss why certain instruments sound the way they do, How do factors such as their physical construction and the method of playing affect their individual characteristcs and timbre? How does the harmonic series come into play, and how does this determine concepts such as scale and temperament Acoustic Guitar Construction and playing style A guitars construction is split in to three parts, the body, the neck and the head. The sound generating part can be found on the body and is called the soundboard. The soundboard has a large round hole in the centre called the sound hole. Also attached to the soundboard is a piece called the bridge, to which one end of the six strings are attached. The bridge has a thin, hard piece embedded into it called the saddle, which is the part that the strings rest against. When the strings are plucked, the vibrations travel through the saddle onto the bridge and then into the soundboard. The soundboard then vibrates. As the body of the guitar is hollow, these vibrations are amplified and emanate from the sound hole. Harmonic Series When a note is struck on a guitar the sound produced is a series of notes. The first harmonic, the fundamental is the loudest and lowest of the series. Along with that you are also hearing tones that accompany the fundamental and are responsible of making the guitar sound the way it does. Guitar harmonics are created when you lightly touch the string at specific positions and then pluck the string, when plucked the string vibrates at its fundamental frequency, also vibrating the integer multiples of the frequency as displayed on the diagram below: The performance of the guitar depends on the quality of the wooden soundboard. The Timbre of the can have a huge impact on the choice of wood, the way the wood is supported, the glue and even the varnish are all taken into consideration as this can have an effect on the sound of the guitar due to the quality of the sound produced DRUM A drum consists of a skin, a shell or body and a mechanism that holds the two pieces together. The skin of the drum is a flexible membrane, stretched tightly around the rim. Drum skins were originally made from animal skins but nowadays most use synthetic skins. The skin is held onto the rim in a variety of ways. Some use tacks or glue while others use ropes or adjustable metal brackets to attach the skin to the body. When a drum is struck, it makes a loud sharp sound followed by a rapidly decreasing tone. The sharp sound is called the attack, and it is made by a stick or hand banging onto the surface. The strike also pushes the drum head downwards. Because the drum head is elastic, it springs back up again with a lot of energy, causing it to go up higher than the position it started in. This causes it to spring back down again. The drum skin goes up and down very quickly, pushing air in front of it and creating the tone, sometimes known as the decay. Some drums, such as the snare, have a sharp attack with almost no tone. Others, like frame drums, have a more mild attack with a tone that goes on and on. The hair cells in the organ of Corti are tuned to certain sound frequencies, being responsive to high frequencies near the oval window and to low frequencies near the apex of the cochleaThe hair cells in the organ of Corti are tuned to certain sound frequencies, being responsive to high frequencies near the oval window and to low frequencies near the apex of the cochleaThe hair cells in the organ of Corti are tuned to certain sound frequencies, being responsive to high frequencies near the oval window and to low frequencies near the apex of the cochleaSecond part (also 750 words): Giving at least 2 significantly different examples, discuss why certain instruments sound the way they do, How do factors such as their physical construction and the method of playing affect their individual characteristcs and timbre? How does the harmonic series come into play, and how does this determine concepts such as scale and temperament Second part (also 750 words): Giving at least 2 significantly d ifferent examples, discuss why certain instruments sound the way they do, How do factors such as their physical construction and the method of playing affect their individual characteristcs and timbre? How does the harmonic series come into play, and how does this determine concepts such as scale and temperament Second part (also 750 words): Giving at least 2 significantly different examples, discuss why certain instruments sound the way they do, How do factors such as their physical construction and the method of playing affect their individual characteristcs and timbre? How does the harmonic series come into play, and how does this determine concepts such as scale and temperament Bottom of Form

Sir Lancelot Analysis

Sir Lancelot is the greatest knight at the Round Table. Lancelot is Arthur’s best friend and yet is completely different in that he performs heroic acts by accident. Lancelot is too humble to allow all his heroic acts to improve his self-image. A hero is someone who engages in a heroic act risking or losing his or her life to save someone else’s. Sir Lancelot is a hero. Lancelot is brave. Lancelot could be called brave because he wasn’t afraid to kill people. If a situation needed immediate action Lancelot was there to battle another knight.Lancelot chose to go on adventures putting aside the dangers he might face. He fought willingly for people, and stood up for himself when he met the witches and battled other knights. Lancelot is loyal. Being loyal means showing support to someone. Lancelot stayed loyal to the one girl he loved even though she was already married. A girl asked Lancelot to fight for her dad and she would free him, and he courageously fought for her dad and didn’t try to get away.Lancelot was loyal to King Arthur by fighting along side him and joining him at the Round Table. Sir Lancelot is a hero. He is considered to be one of the greatest and most trusted of King Arthur’s knights and he played a huge part in King Arthur’s victories. Lancelot is a hero because he battles with honor and strategy, he understands how to win. Lancelot was heroic because he never failed in gentleness, courage, or courtesy. No matter who he was he still served others.

Hitler s And The Nazi Party - 1409 Words

Hitler s henchmen were those inside the Richstag and other important segments of the German government. These include Joseph Goebbels, Hermann Goering, Rudolf Hess, Heinrich Himmler, Ernst Rohm, Reinhard Heydrich. It is debated if they escaped justice or not. Joseph Goebbels was born in 1897 and became a doctor in philosophy in 1920. Due to his hatred of the terms of the Treaty of Versailles, he joined the Nazi party near the end of 1924 to help build support for the party in Berlin. In 1923 he was given full control of the Nazi s propaganda machine. Goebbels was elected into the Reichstag in 1928 and, at 1933, was given the role as the Minister of Enlightenment and Propaganda , which he worked as until 1945. His skill at the role gave him the nickname as the Poison Dwarf . At the near-end of the Second World War when Berlin was besieged by the Russians during April to May 1945, Joseph stayed with Hitler in his bunker. Which he was given Hitler s watch as a token of appreciation for being with him to the very end. On May 1st, Goebbels poisoned his six children then shot his wife and then himself. Hermann Goering was born in 1893 and found popularity in World War One as a fighter ace. Winning many awards for bravery and was the last commander of the infamous Richthofen Fighter Squadron. He joined the Nazi Party in October 1922 and wounded in the Munich Putsch. In 1928, Goering got elected to the Reichstag before he got back from Sweden. During 1932, he wasShow MoreRelatedThe Rise And Fall Of Hitler s Nazi Party1301 Words   |  6 Pages The Rise and Fall of Hitler’s Nazi Party In the world today and since the beginning of time fear is and always has been a powerful emotion. For the people who control it it’s the perfect tool. They disguise it as happiness while they can conduct their evil actions, and their choices can appear to be the right ones when the mind is fogged by panic. 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Chico, Muchacho, and Other Spanish Words for Children

Chico, muchacho, nià ±o — and their feminine equivalents, chica, muchacha, and nià ±a — and just a few of the words you can use in Spanish to refer to children. But they arent all used in the same way. In most cases, youre safe to use any of the above words to refer to boys and girls. However, in some cases they can have more specialized uses. Using Chico and Chica As a general adjective, chico is simply a word for small, especially when referring to something that is smaller than other beings or things of its type. When it becomes a noun referring to people, however, it usually refers to someone of a young age rather than someone of short stature. The age of children used for chico and chica varies somewhat with region. However, it is often used as a term of affection for people other than children. For example, in Cuba it frequently is used to address friends, something like hey dude or buddy might be in American slang. It is also very common to use chica when referring to young, single women, especially ones in which men might be interested in for romantic purposes — something like the equivalent of babe. To a lesser extent, chico can fulfill a similar role. Similarly, the two terms commonly are used for girlfriend and boyfriend, respectively. The main characters in a movie, TV show or novel are often referred to as chico or chica, especially if they are young and attractive. Using Muchacho and Muchacha When referring to adolescents or teenagers, muchacho/a can usually be used interchangeably with chico/a. In most areas it isnt used often when referring to younger children. Muchacho/a can also be used to refer to a young servant or maid. Using Nià ±o and Nià ±a Nià ±o and nià ±a are more general and sometimes slightly more formal words for children. Their use might be preferred in situations where wed talk about a child in English rather than a boy or girl. For example, a school handout might say something such as Cada nià ±o debe leer un libro por mes for Each child should read one book per month. (Following the Spanish rule of gender, nià ±os can refer to a mixed group of boys and girls, not necessarily just boys. In sentences such as the above, the context suggests that cada nià ±o refers to each child, not necessarily just each boy.) Nià ±o is also used in situations where the speaker is referring to young age or inexperience in general. For example, a child soldier is a nià ±o soldado, and a street child is a nià ±o/a de la calle. Similarly, someone who is worse than a child is peor que un nià ±o — words such as chico and muchacho wouldnt work well in that context. Other Words Referring to Children Other words for talking about children include: Hijo and hija refer specifically to a son or daughter, respectively. Nià ±o/a can also be used with the same meaning if the context is clear.Criatura, a cognate of creature, is sometimes used an affectionate term. For example,  ¡Quà © criatura hermosa! might be translated loosely as What a beautiful little angel! Note that criatura is always feminine, even if it refers to a boy.Descendiente can be used as a replacement for hijo or hija; it is used much more than the English descendant. The word can be either masculine or feminine depending on whether it refers to a son or daughter. It can also refer to descendants such as great-grandchildren.Bebà © is the most common word for baby. Note that it is always masculine, even when referring to a girl.