Neurobiology of Harmony
How sound waves produced by instruments become sensible representations in the brain, and how the perceptions become meaningful are interesting questions for neurobiology to ask, as well as necessary ones if knowledge of the brain is to account for all behavior. The brain is able to discern harmony because the inner ear is capable of differentiating between different frequencies. The brain's differentiation between pitches and chords corresponds to the physical, "real," differences between notes and chords, although our sense of music built from perception of harmonies through time, is more subjective and variable.
Our faculty of hearing derives from the anatomy of the inner ear and the brain, as well as from the existence of external stimuli in the outside world. Sound is both the mechanical energy of waves and the sensation produced by receptors in the brain (1). Each wave has an amplitude and a frequency. The amplitude of a vibration corresponds to its volume and is measured by decibels on a logarithmic scale. Frequency is logarithmic, as well, but corresponds to differences in pitch. Greater frequency results in a higher pitch. Mathematically, pitch is represented as the number of vibrations per second (1) (2) .
Vertebrates hear sound through their neurobiological makeup. The ear's tympanic membrane, or eardrum, vibrates as a result of being subjected to sound waves. The waves then travel to the inner ear or cochlea which is the site of sound's transduction into chemical energy. Within the cochlea, sound waves travel through fluid which stimulates the stereocilia, small hair-like projections of hair cells along the basilar membrane. The actions of the stereocilia cause the release of K+, potentially depolarizing the cell (1). The flexibility of the basilar membrane allows stereocilia to move back and forth in response to the waves in the Cochlear fluid. Each stereocilium is linked to another through structures called "tip links" (1) , (3) As the stereocilia move towards the tallest ones, the tip links cause ion channels to open, depolarizing the cell and allowing free K+ to move into the cell (1). Importantly, the stereocilia move in direct response to the sound waves and are cumulative rather than spiking. Neurotransmitter release corresponds to the frequency and amplitude (pitch and volume) of a sound input. Sounds must be sufficiently loud and within a given range in order to cause action potentials. Different sounds will produce different outputs, allowing for discrimination of harmony on a neural level (1).
Hearing allows us to take in noises from the surrounding environment and gives us a sense of where things are in relation to us. All those little folds on the outside of the ear, called the tonotopic organization, make it so sound waves in the air are directed to the ear canal, where they can be further processed. Once in the ear, the sound waves vibrate the ear drum, which tell the ear exactly what frequency it is sensing. The vibration of the ear drum is not quite enough to send a signal to the brain, so it needs to be amplified, which is where the three tiny bones in the ear come into play. The malleus or hammer, incus or anvil, and stapes or stirrup amplify this sound and send it to the cochlea. The cochlea conducts the sound signal through a fluid with a higher inertia than air, so this is why the signal from the ear drum needs to be amplified. It is much harder to move the fluid than it is to move the air. The cochlea basically takes these physical vibrations and turns them into electrical impulses that can be sent to the brain. This is...
Most people are familiar with the word "music", however they barely consider the definition of it. After carefully think, everyone has their own opinions on this term and it is hard to have an uniform criterion of music sounds. According to the text book, Michael B. Bakan states five propositions to define the music. The first one is about the tone and the second one talks about the music is organized in some way. The next two are claims that music is human organized and a product of human intention and perception. The last proposition argues music cannot separate from Western culture. Among these propositions, I think the music is a product of human intention and perception is most interesting and worth to discuss. So I assert that the most
In 771, after his bother passed away, Charlemagne became the king of the Franks, and reigned as the king until the year 814. Charlemagne became known as the “father of Europe”. Charlemagne had one of the biggest and strongest army’s. He was
If you put your finger gently on a loudspeaker you will feel it vibrate - if it is playing a low note loudly you can see it moving. When it moves forwards, it compresses the air next to it, which raises its pressure. Some of this air flows outwards, compressing the next layer of air. The disturbance in the air spreads out as a travelling sound wave. Ultimately this sound wave causes a very tiny vibration in your eardrum - but that's another story.
Basilar membrane acts as a divider of two fluids (scala media and the scala tympani) and the hair cells pick up movement in order to send a signal to the brain to interpret the sound.
The Role Of Discretion In Police Work, Its Strengths And Its Weaknesses. (n.d.). The Role Of Discretion In Police Work, Its Strengths And Its Weaknesses. Retrieved November 18, 2013, from http://www.researchomatic.com/essay/The-Role-Of-Discretion-In-Police-Work-Its-Strengths-And-Its-Weaknesses-95144.aspx
From this point, vibration of the connective membrane (oval window) transforms mechanical motion into a pressure wave in fluid. This pressure wave enters and hence passes vibrations into the fluid filled structure called the cochlea. The cochlea contains two membranes and between these two membranes, are specialized neurons or receptors called hair cells. Once vibrations enter the cochlea, they cause the lower membrane (basilar membrane) to move in respect to the upper membrane (i.e. the tectorial membrane in which the hair cells are embedded). This movement bends the hair cells to cause receptor potentials in these cells which in turn cause the release of transmitter onto the neurons of the auditory nerve.
This research proposal seeks to establish the level of police discretion used on duty. It aims to understand when it is appropriate for police to use discretion as well as given reasons for abusing their decisions. It focuses on issues with police discretion maintaining the responsibility to be ethical such as racial profiling, socioeconomic status and excessive force. Although police discretion can have positive factors, it also difficult to determine whether it is fair for police to make a decision during situations.
Police officers are faced each day with a vast array of situations with which they must deal. No two situations they encounter are ever the same, even when examines a large number of situations over an extended period of time. The officers are usually in the position of having to make decisions on how to handle a specific matter alone, or with little additional advice and without immediate supervision. This is the heart of police discretion. As we shall find, the exercise of discretion by police has benefits and problems associated with such exercise. The unfettered use of discretion can lead to the denial of citizen rights. Strategies that control the use of discretion are, therefore, very important. The benefits and problems of police discretion and controlling strategies are the focus of this essay.
As the use of performance enhancing drugs is becoming more popular amongst athletes, many of them do not understand the risks involved in taking these drugs. Many people are looking for a quick way to build muscles, or to get stronger the fastest way possible. Using these performance aids may very well be a quick fix for many athletes, but taking the drugs is unethical and dangerous. Using special drugs to boost an athlete’s performance is degrading to sports and to the athlete, but after they stop using the drugs and lose some strength, you become trapped in the steroid cycle.
Abstract: With the increase of competition has also come the need to become bigger and stronger than the opponent. The use of steroids among athletes has caused the focus of the game to change. No longer does an athlete want to win by doing their best, but they want to become bigger and have an advantage over the opponent. Ultimately, all athletes feel that they need to use performance-enhancing drugs to compete at the same level. Despite all of the warnings and information on performance-enhancing drugs, athletes continue to use them and overlook the potential health risks associated with steroids.
Domestic violence has a long historical presence in our society. Initially, it was viewed strictly as a family matter. It was an acceptable means for men to discipline their wives and children, who were regarded as little more than man’s property. There was a lack of, if any, legal ramifications for the abuser and, in fact, domestic violence had been previously sanctioned by English Common law (The National Center for Victims of Crime). As the issue infiltrated public consciousness, advocacy groups rose to the forefront and championed for the rights of abused victims. They demanded change, not only to the laws, but to the way victims and abusers are treated by law enforcement and legal institutions. As a result of these efforts, many changes have been successfully implemented.
The use of discretion in the profession of law enforcement has shown to be an inevitable practice. Police officers routinely use their own beliefs and judgments to make critical decisions that include the life and liberty of the citizens in the community they serve in. Although discretion has both negative and positive sides to it, discretion is impossible to be eliminated from law enforcement. The best way to use discretion in a safe manner is to practice using discretion while on and off duty as well. While practicing discretion, officers should keep their own beliefs and prejudice to themselves and out of line of duty. When police officers are on duty, they must have knowledge of what is going on around them and eliminate discriminatory factors and use confidence to make a lawful
A signal is passed from the cerebellum to the thalamus to search for signs of danger (“How Our Brains Process Music”). The thalamus works with the hippocampus, the memory center of the brain to find connections between the sound compared to archived sounds or danger associations (“How Our Brains Process Music”). The thalamus connects the the amygdala which results in an emotional response allowing for the “fight or flight” response to be engaged (“How Our Brains Process Music”). Next the brain processes the music into neural codes. When neurons activate, known as “firing”, it becomes an electrical signal that releases neurotransmitters (“How Our Brains Process Music”). The neurotransmitters then move in to the synapses of the
What distinguishes sound waves from most other waves is that humans easily can perceive the frequency and amplitude of the wave. The frequency governs the pitch of the note produced, while the amplitude relates to the sound le...